# Solved papers for RAJASTHAN PMT Rajasthan - PMT Solved Paper-2010

### done Rajasthan - PMT Solved Paper-2010

• question_answer1) A block of metal weighing 2 kg is resting on a frictionless plane. It is strucked by a jet releasing. Water at a rate of 1 kg/s and at a speed of 5 m/s. The initial acceleration of the block will be

A) $2.5\,m/{{s}^{2}}$

B) $5.0\,m/{{s}^{2}}$

C) $10\,m/{{s}^{2}}$

D) none of these

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• question_answer2) A body of mass 2 kg is being dragged with uniform velocity of 2 m/s on a rough horizontal plane. The coefficient of friction between the body and the surface is 0.20. The amount of heat generated in 5 s is V = 4.2 J/cal and $g=9.8\,m/{{s}^{2}}$)

A) 9.33 cal

B) 10.21 cal

C) 12.67 cal

D) 13.34 cal

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• question_answer3) From an automatic gun a man fires 360 bullet per minute with a speed of 360 km/h. If each weighs 20g, the power of the gun is

A) 600 W

B) 300 W

C) 150 W

D) 75 W

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• question_answer4) An annular ring with inner and outer radii ${{R}_{1}}$ and ${{R}_{2}}$is rolling without slippling with a uniform angular speed. The ratio of the forces experienced by the two particles situated on the inner and outer parts of the ring, $\frac{{{F}_{1}}}{{{F}_{2}}}$is

A) 1

B) $\left( \frac{{{R}_{1}}}{{{R}_{2}}} \right)$

C) $\frac{{{R}_{2}}}{{{R}_{1}}}$

D) ${{\left( \frac{{{R}_{1}}}{{{R}_{2}}} \right)}^{2}}$

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• question_answer5) A rubber cord catapult has cross-sectional area $25\,m{{m}^{2}}$ and initial length of rubber cord is 10 cm. It is stretched to 5 cm and then released to project a missile of mass 5 g. Taking ${{Y}_{rubber}}\,=5\times {{10}^{8}}\,N/{{m}^{2}}$. Velocity of projected missile is

A) $20\,m/{{s}^{-1}}$

B) $100\,m/{{s}^{-1}}$

C) $250\,m/{{s}^{-1}}$

D) $200\,m/{{s}^{-1}}$

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• question_answer6) If the work done in blowing a bubble of volume V is W then the work done in blowing bubble of volume 2 V from the same soap solution will be

A) W/2

B) $\sqrt{\text{2}}\,\text{W}$

C) $\sqrt[\text{3}]{\text{2}}\,\text{W}$

D) $\sqrt[\text{3}]{\text{4}}\,\text{W}$

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• question_answer7) 540 g of ice of $0{}^\circ C$ is mixed with 540 g of water at $80{}^\circ C$. The final temperature of the mixture is

A) $0{}^\circ C$

B) $40{}^\circ C$

C) $80{}^\circ C$

D) less than $0{}^\circ C$

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• question_answer8) The coefficient of thermal conductivity of copper is 9 times that of steel. In the composite cylindrical bar shown in the figure, what will be the temperature at the junction of copper and steel? A) $75{}^\circ C$

B) $67{}^\circ C$

C) $33{}^\circ C$

D) $25{}^\circ C$

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• question_answer9) In order to double the frequency of the fundamental note emitted by a stretched string, the length is reduced to$\frac{\text{3}}{\text{4}}\text{th}$ of the original length and the tension is changed. The factor by which the tension is to be changed is

A) $\frac{\text{3}}{8}$

B) $\frac{2}{3}$

C) $\frac{8}{9}$

D) $\frac{9}{4}$

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• question_answer10) A $\text{10}\,\text{F}$ capacitor is charged to a potential difference of 1000 V. The terminals of the charged capacitor are disconnected from the power supply and connected to the terminals of an uncharged 6uF capacitor. What is the final potential difference across each capacitor?

A) 167 V

B) 100 V

C) 625 V

D) 250 V

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• question_answer11) In the circuit shown in figure, switch S; is initially closed and ${{S}_{2}}$ is open. Find ${{V}_{a}}-{{V}_{b.}}$. A) 4 V

B) 8 V

C) 12 V

D) 16 V

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• question_answer12) Two bulbs consume same power when operated at 200V and 300V respectively. When these bulbs are connected in series across a DC source of 500 V, then

A) ratio of potential differences across them is 3/2

B) ratio of potential differences across them is 9/4

C) ratio of powers consumed across them is 4/9

D) ratio of powers consumed across them is 2/3

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• question_answer13) Two magnets are held together in a vibration magnetometer and are allowed to oscillate in the earths magnetic field with like poles together, 12 oscillations per minute are made but for unlike poles together only 4 oscillations per minute are executed. The ratio of their magnetic moments is

A) 3 : 1

B) 1 : 3

C) 3 : 5

D) 5 : 4

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• question_answer14) The molar heat capacity in a process of a diatomic gas if it does a work of $\frac{Q}{4},$when a heat of Q is supplied to it is

A) $\frac{2}{5}R$

B) $\frac{5}{2}R$

C) $\frac{10}{3}R$

D) $\frac{6}{7}R$

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• question_answer15) The dimensions of $\frac{a}{b}$in the equation$P=\frac{a-{{t}^{2}}}{bx},$ where p is pressure, x is distance and t is time, are

A) $[M{{T}^{-2}}]$

B) $[{{M}^{2}}{{T}^{-3}}]$

C) $[M{{L}^{3}}{{T}^{-1}}]$

D) $[L{{T}^{-3}}]$

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• question_answer16) Dimensions of $\frac{1}{{{\mu }_{0}}{{\varepsilon }_{0}}},$where symbols have their usual meanings are

A) $[L{{T}^{-1}}]$

B) $[{{L}^{-1}}T]$

C) $[{{L}^{-}}^{2}{{T}^{2}}]$

D) $[{{L}^{2}}{{T}^{-2}}]$

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• question_answer17) A body is projected vertically up with a velocity v and after some time it returns to the point from which it was projected. The average velocity and average speed of the body for the total time of flight are

A) $\frac{{\mathbf{\vec{v}}}}{2}and\frac{v}{2}$

B) $0\,and\frac{v}{2}$

C) 0 and 0

D) $\frac{{\mathbf{\vec{v}}}}{2}and\,0$

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• question_answer18) A sphere of mass m is tied to end of a string of length$l$and rotated through the other end along a horizontal circular path with speed v. The work done in full horizontal circle is

A) zero

B) $\left( \frac{m{{v}^{2}}}{l} \right)2\pi l$

C) $mg.\,2\pi l$

D) $\left( \frac{m{{v}^{2}}}{l} \right)(l)$

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• question_answer19) For a body moving in a circular path, a condition for no skidding if$\mu$ is the coefficient of friction, is

A) $\frac{m{{v}^{2}}}{r}\le \mu mg$

B) $\frac{m{{v}^{2}}}{r}\ge \mu mg$

C) $\frac{v}{r}=\mu g$

D) $\frac{m{{v}^{2}}}{r}=\mu mg$

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• question_answer20) A car is moving with a uniform speed on a level road. Inside the car there is a balloon filled with helium and attached to a piece of string tied to the floor. The string is observed to be vertical. The car now takes a left turn maintaining the speed on the level road. The balloon in the car will

A) continue to remain vertical

B) burst while taking the curve

C) be thrown to the right side

D) be thrown to the left side

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• question_answer21) Two balls of masses ${{m}_{1}}$ and${{m}_{2}}$ are separated from each other by a powder charge placed between them. The whole system is at rest on the ground. Suddenly the powder charge explodes and masses are pushed apart. The mass${{m}_{1}}$travels a distance ${{S}_{1}}$ and stops. If the coefficients of friction between the balls and ground are same, the mass ${{m}_{2}}$stops after travelling the distance

A) ${{s}_{2}}=\frac{{{m}_{1}}}{{{m}_{2}}}{{s}_{1}}$

B) ${{s}_{2}}=\frac{{{m}_{2}}}{{{m}_{1}}}{{s}_{1}}$

C) ${{s}_{2}}=\frac{{{m}_{1}}}{m_{2}^{2}}{{s}_{1}}$

D) ${{s}_{2}}=\frac{m_{2}^{1}}{m_{1}^{2}}{{s}_{1}}$

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• question_answer22) A cricket ball of mass 250 g collides with a bat with velocity 10 m/s and returns with the same velocity within 0.01 s. The force acted on bat is

A) 25 N

B) 50 N

C) 250 N

D) 500 N

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• question_answer23) When a spring is stretched by 2 cm, it stores 100 J of energy. If it is stretched further by 2 cm, the stored energy will be increased by

A) 100 J

B) 200 J

C) 300 J

D) 400 J

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• question_answer24) The kinetic energy of a body decreases by 36%. The decrease in the momentum is

A) 36%

B) 20%

C) 8%

D) 6%

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• question_answer25) A wheel has a speed of 1200 revolutions per minute and is made to slow down at a rate of 4 radians/s2.The number of revolutions it makes before coming to rest is

A) 143

B) 272

C) 314

D) 722

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• question_answer26) When a uniform solid sphere and a disc of the same mass and of the same radius rolls down an inclined smooth plane from rest to the same distance, then the ratio of the time taken by them is

A) 15 : 14

B) ${{15}^{2}}:{{14}^{2}}$

C) $\sqrt{14}:\sqrt{15}$

D) 14 : 15

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• question_answer27) The diameters of two planets are in the ratio 4 : 1 and their mean densities in the ratio 1 : 2. The acceleration due to gravity on the planets will be in ratio

A) 1 : 2

B) 2 : 3

C) 2 : 1

D) 4 : 1

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• question_answer28) At the surface of a certain planet, acceleration due to gravity is one-quarter of that on earth. If a brass ball is transported to this planet, then which one of the following statements is not correct?

A) The mass of the brass ball on this planet is a quarter of its mass as measured on earth

B) The weight of the brass ball on this planet is a quarter of the weight as measured on earth

C) The brass ball has the same mass on the planet as on earth

D) The brass ball has the same volume on the other planet as on earth

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• question_answer29) A clock S is based on oscillation of a spring and a clock P based on pendulum motion. Both clocks run at the same rate on earth. On a planet having the same density as earth but twice the radius

A) S will run faster than P

B) P will run faster than S

C) they will both run at the same rate as on the earth

D) None of the above

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• question_answer30) At a given place where acceleration due to gravity is $g\,m/{{s}^{2}},$ a sphere of lead of density $d\,kg/{{m}^{3}}$ is getting released in a column of liquid of density$\text{ }\!\!\!\!\text{ }\text{ }\!\!\!\!\text{ }$ $kg\,/{{m}^{3}}$. If $d>\rho ,$ the sphere will

A) fall vertically with an acceleration $g\,m/{{s}^{2}}$

B) fall vertically with no acceleration

C) fall vertically with an acceleration$\left( \frac{d-\rho }{d} \right)$

D) fall vertically with an acceleration$\left( \frac{\rho }{d} \right)$

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• question_answer31) The diameter of a brass rod is 4 mm and Youngs modulus of brass is $9\times {{10}^{10}}\,N/{{m}^{2}}$. The force required to stretch by 0.1% of its length is

A) $360\,\pi N$

B) 36 N

C) $144\pi \times {{10}^{3}}N$

D) $36\pi \times {{10}^{5}}N$

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• question_answer32) A ball falling in a lake of depth 200m shows 0.1% decrease in its volume at the bottom. What is the bulk modulus of the material of the ball

A) $19.6\,\times {{10}^{8}}\,N/{{m}^{2}}$

B) $19.6\,\times {{10}^{-10}}\,N/{{m}^{2}}$

C) $19.6\,\times {{10}^{10}}N/{{m}^{2}}$

D) $19.6\,\times {{10}^{-8}}\,N/{{m}^{2}}$

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• question_answer33) If one end of a wire is fixed with a rigid support and the other end is stretched by a force of 10 N, then the increase in length is 0.5 mm. The ratio of the energy of the wire and the work done in displacing it through 1.5 mm by the weight is

A) $\frac{1}{3}$

B) $\frac{1}{4}$

C) $\frac{1}{2}$

D) 1

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• question_answer34) The increase in length on stretching a wire is 0.05%. If its Poissons ratio is 0.4, then its diameter will be

A) reduced by 0.02%

B) reduced by 0.1%

C) increased by 0.02%

D) decreased by 0.4%

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• question_answer35) Work done in splitting a drop of water of 1 mm radius into 10 droplets is (surface tension of water $=72\,\times {{10}^{-3}}J/{{m}^{2}}$)

A) $9.58\,\times {{10}^{-5}}J$

B) $8.95\,\times {{10}^{-5}}J$

C) $5.89\,\times {{10}^{-5}}J$

D) $5.98\,\times {{10}^{-6}}J$

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• question_answer36) Water rises to a height of 16.3 cm in a capillary tube of height 18 cm above the water level. If the tube is cut at a height of 12 cm, then

A) water will come as a fountain from the capillary tube

B) water will stay at a height of 12 cm in the capillary tube

C) the height of the water in the capillary tube will be 10.3 cm

D) water will flow down the sides of the capillary tube

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• question_answer37) Two bodies are in equilibrium when suspended in water from the arms of a balance. The mass of one body is 36 g and its density is $9\,g/c{{m}^{3}}$. If the mass of the other is 48 g, its density in $g/c{{m}^{3}}$ is

A) $\frac{4}{3}$

B) $\frac{3}{2}$

C) 3

D) 5

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• question_answer38) The fraction of a floating object of volume${{V}_{0}}$ and density${{d}_{0}}$above the surface of liquid of density$d$ will be

A) $\frac{{{d}_{0}}}{d}$

B) $\frac{d{{d}_{0}}}{d+{{d}_{0}}}$

C) $\frac{d-{{d}_{0}}}{d}$

D) $\frac{d{{d}_{0}}}{d-{{d}_{0}}}$

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• question_answer39) A constant pressure air thermometer gave a reading of 47.5 units of volume when immersed in ice cold water, and 67 units in a boiling liquid. The boiling point of the liquid will be

A) $135{}^\circ C$

B) $125{}^\circ C$

C) $112{}^\circ C$

D) $100{}^\circ C$

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• question_answer40) A breaker is completely filled with water at $4{}^\circ C$. It will overflow if

A) heated above $4{}^\circ C$

B) cooled below $4{}^\circ C$

C) both heated and cooled above and below $4{}^\circ C$ respectively

D) None of the above

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• question_answer41) The following sets of values for${{C}_{V}}$and ${{C}_{P}}$ of a gas has been reported by different students. The units are cal/g-mol-K. Which of these sets is most reliable?

A) ${{C}_{V}}=3,\,{{C}_{p}}=5$

B) ${{C}_{V}}=4,\,{{C}_{p}}=6$

C) ${{C}_{V}}=3,\,{{C}_{p}}=2$

D) ${{C}_{V}}=3,\,{{C}_{p}}=4.2$

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• question_answer42) A cylinder of capacity 20 L is filled with H2 gas. The total average kinetic energy of translator motion of its molecules is $1.5\,\times {{10}^{5}}J$. The pressure of hydrogen in the cylinder is

A) $2\times {{10}^{6}}\,N/{{m}^{2}}$

B) $3\times {{10}^{6}}\,N/{{m}^{2}}$

C) $4\times {{10}^{6}}\,N/{{m}^{2}}$

D) $5\times {{10}^{6}}\,N/m$

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• question_answer43) An engineer claims to have made an engine delivering 10 kW power with fuel consumption of 1 g/s. The calorific value of the fuel is 2 kcal/g. The claim of the engineer is

A) valid

B) invalid

C) depends on engine design

D) depends of the load

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• question_answer44) Find the change in the entropy in the following process 100 gm of ice at $0{}^\circ C$ melts when dropped in a bucket of water at $50{}^\circ C$. (Assume temperature of water does not change)

A) - 4.5 cal/K

B) + 4.5 cal/K

C) + 5.4 cal/K

D) - 5.4 cal /K

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• question_answer45) A cylinder of fixed capacity 44.8 L contains a monoatomic gas at standard temperature and pressure. The amount of heat required to raise the temperature of cylinder by $10{}^\circ C$ will be (R = universal gas constant)

A) R

B) 10 R

C) 20 R

D) 30 R

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• question_answer46) Two spheres of different materials one with double the radius and one-fourth with thickness of the other, are filled with ice. If the time taken for complete melting of ice in the large radius one is 25 min and that for smaller one is 16 min, the ratio of thermal conductivities of the materials of larger sphere to the smaller sphere is

A) 4 : 5

B) 5 : 4

C) 25 : 1

D) 1 : 25

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• question_answer47) An ideal black body at room temperature is thrown into a furnace. It is observed that

A) initially, it is the darkest body and at later times the brightest

B) it is the darkest body at all times

C) it cannot be distinguished at all times

D) initially, it is the darkest body and at later times it cannot be distinguished

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• question_answer48) An emf of 100 mV is induced in a coil when the current in another nearby coil becomes 10 A from zero in 0.1 s. The coefficient of mutual induction between the two coils will be

A) 1 mH

B) 10 mH

C) 100 mH

D) 1000 mH

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• question_answer49) In an L-R circuit, time constant is that time in which current grows from zero to the value (where ${{I}_{0}}$is the steady state current)

A) 0.63${{I}_{0}}$

B) 0.50${{I}_{0}}$

C) 0.37 ${{I}_{0}}$

D) ${{I}_{0}}$

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• question_answer50) The horizontal component of .the earths magnetic field at a place is $3\times {{10}^{-4}}T$ and the dip is ${{\tan }^{-1}}\left( \frac{4}{3} \right).$ A metal rod of length 0.25 m placed in the north-south position and is moved at a constant speed of 10 cm/s towards the east. The emf induced in the rod will be

A) zero

B) $1\,\mu V$

C) $5\,\mu V$

D) $10\,\mu V$

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• question_answer51) In $\text{L-C-R}$ circuit, $\text{R=100}\,\Omega$ When capacitance C is removed, the current lags behind the voltage by$\frac{\pi }{3}.$ When inductance L is removed, the current leads the voltage by $\frac{\pi }{3}.$The impedance of the circuit is

A) $50\,\Omega$

B) $100\,\Omega$

C) $200\,\Omega$

D) $400\,\Omega$

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• question_answer52) If 10000 V is applied across an X-ray tube, what will be the ratio of de-Broglie wavelength of the incident electrons to the shortest wavelength of X-ray produced? (e/m for electron is $1.8\,\times {{10}^{11}}Ck{{g}^{-1}}$)

A) 1

B) 0.1

C) 0.2

D) 0.3

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• question_answer53) An electron is accelerated through a potential difference of 1000 V. Its velocity is nearly

A) $3.8\,\times {{10}^{7}}m/s$

B) $\text{1}\text{.9 }\!\!\times\!\!\text{ 1}{{\text{0}}^{6}}\text{m/s}$

C) $\text{1}\text{.9 }\!\!\times\!\!\text{ 1}{{\text{0}}^{7}}\text{m/s}$

D) $\text{5}\text{.7 }\!\!\times\!\!\text{ 1}{{\text{0}}^{7}}\text{m/s}$

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• question_answer54) A photon, an electron and uranium nucleus all have the same wavelength. The one with the most energy

A) is the photon

B) is the electron

C) is the uranium nucleus

D) depends upon the wavelength and the properties of the particle

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• question_answer55) Which of the following statements is not correct?

A) Photographic plates are sensitive to infrared rays

B) Photographic plates are sensitive to ultraviolet rays

C) Infra red rays are invisible but can cast shadows like visible light

D) Infrared photons have more energy than photons of visible light

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• question_answer56) Assuming photoemission to take place, the factor by which the maximum velocity of the emitted photoelectrons changes when the wavelength of the incident radiation is increased four times, is

A) 4

B) $\frac{1}{4}$

C) 2

D) $\frac{1}{2}$

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• question_answer57) 57. A nucleus$z{{X}^{A}}$ emits 9 $\alpha -$-particles and 5 $\beta$-particles. The ratio of total protons and neutrons in the final nucleus is

A) $\frac{Z-13}{(A-Z-23)}$

B) $\frac{Z-18}{(A-36)}$

C) $\frac{Z-13}{(A-36)}$

D) $\frac{Z-13}{(A-Z-13)}$

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• question_answer58) If${{t}_{1/2}}$is the half-life of a substance then${{t}_{3/4}}$is the time in which substance

A) decays$\frac{\text{3}}{\text{4}}\text{th}$

B) remains$\frac{\text{3}}{\text{4}}\text{th}$

C) decays$\frac{1}{2}\text{th}$

D) remains$\frac{1}{2}\text{th}$

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• question_answer59) An AC source of angular frequency $\omega$ is fed across a resistor rand a capacitor C in series. The current registered is $i.$ If now the frequency of source is changed to$\omega /3$ (but maintaining the same voltage), the current in the circuit is found to be halved. Calculate the ratio of reactance to resistance at the original frequency$\omega$.

A) $\sqrt{\frac{3}{5}}$

B) $\sqrt{\frac{2}{5}}$

C) $\sqrt{\frac{1}{5}}$

D) $\sqrt{\frac{4}{5}}$

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• question_answer60) Susceptibility of Mg at 300 K is $1.2\,\times {{10}^{-5}}$. The temperature at which susceptibility will be $1.8\,\times {{10}^{-5}}$ is

A) 450 K

B) 200 K

C) 375 K

D) None of these

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• question_answer61) In transistor, forward bias is always smaller than the reverse bias. The correct reason is

A) to avoid excessive heating of transistor

B) to maintain a constant base current

C) to produce large voltage gain

D) None of the above

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• question_answer62) In the Boolean algebra $\overline{(\overline{A.}\overline{B}).}$ A equals to

A) $\overline{A+B}$

B) A

C) A.B

D) A + B

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• question_answer63) The maximum peak to peak voltage of an AM wire is 24 mV and the minimum peak to peak voltage is 8 mV. The modulation factor is

A) 10%

B) 20%

C) 25%

D) 50%

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• question_answer64) The focal length of objective lens and eyelens of a microscope are 4 cm and 8 cm respectively. If the least distance of distinct vision is 24 cm and object distance is 4.5 cm from the objective lens, then the magnifying power of the microscope will be

A) 18

B) 32

C) 64

D) 20

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• question_answer65) When the length of a microscope tube increases, its magnifying power

A) decreases

B) increases

C) does not change

D) may decrease or increase

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• question_answer66) On a rainy day, a small oil film on water show brilliant colours. This is due to

A) dispersion of light

B) interference of light

C) absorption of light

D) scattering of light

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• question_answer67) Two waves having intensities in the ratio 25 : 4 produce interference. The ratio of the maximum to the minimum intensities is

A) 5 : 2

B) 7 : 3

C) 49 : 9

D) 9 : 49

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• question_answer68) A Carnot engine whose low temperature reservoir is at $7{}^\circ C$ has an efficiency of 50%. It is desired to increase the efficiency to 70%. By how many degrees should the temperature of the high temperature reservoir be increased?

A) 840 K

B) 280 K

C) 560 K

D) 373 K

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• question_answer69) Two long straight wires are set parallel to each other. Each carries a current; in the same direction and the separation between them is 2r. The intensity of the magnetic field midway between them is A) $\frac{{{\mu }_{0i}}}{r}$

B) $\frac{4{{\mu }_{0i}}}{r}$

C) zero

D) $\frac{{{\mu }_{0i}}}{4r}$

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• question_answer70) In hydrogen atom, an electron is revolving in the orbit of radius $0.53\,\overset{\text{o}}{\mathop{\text{A}}}\,$ with $6.6\,\times {{10}^{15}}$ rotation/s. Magnetic field produced at the centre of the orbit is

A) $0.125\,Wb/{{m}^{2}}$

B) $1.25\,Wb/{{m}^{2}}$

C) $12.5\,Wb/{{m}^{2}}$

D) $125\,\,Wb/{{m}^{2}}$

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• question_answer71) An electric bulb illuminates a plane surface. The intensity of illumination on the surface at the point 2m away from the bulb is $5\times {{10}^{-4}}$ phot (lumen/$c{{m}^{2}}$). The line joining the bulb to the paint makes an angle of $60{}^\circ$ with the normal to the surface. The intensity of the bulb in candela is

A) $40\sqrt{3}$

B) 40

C) 20

D) $40\times {{10}^{-7}}$

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• question_answer72) Two batteries of emfs 4 V and 8 V with internal resistances $1\,\Omega$ and$2\,\Omega$ are connected in a circuit with a resistance of $9\,\Omega$as shown in figure. The current and potential difference between the points P and Q are A) $\frac{\text{1}}{\text{2}}\text{A}\,\text{and}\,\text{3}\,\text{V}$

B) $\frac{\text{1}}{6}\text{A}\,\text{and}\,4\,\text{V}$

C) $\frac{\text{1}}{9}\text{A}\,\text{and}\,9\,\text{V}$

D) $\frac{\text{1}}{2}\text{A}\,\text{and}\,12\,\text{V}$

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• question_answer73) The energy required to accelerate a car from 10 m/s to 20 m/s is how many times the energy required to accelerate the car from rest to 10 m/s?

A) Equal

B) 4 times

C) 2 times

D) 3 times

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• question_answer74) A cell of internal resistance$1.5\Omega$ and ofemfl.5V balances 500 cm on a potentiometer wire. If a wire of$15\Omega$ is connected between the balance point and the cell, then the balance point will shift

A) to zero

B) by 500 cm

C) by 750 cm

D) None of these

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• question_answer75) The colour sequence in a carbon resistor is red, brown, orange and silver. The resistance of the resistor is

A) $21\times {{10}^{3}}\pm \,10%$

B) $23\times {{10}^{1}}\pm \,10%$

C) $21\times {{10}^{3}}\pm \,10%$

D) $12\times {{10}^{3}}\pm \,5%$

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• question_answer76) A moving coil galvanometer has a resistance of $50\Omega$ and gives full scale deflection for 10 mA. How could it be converted into an ammeter with a full scale deflection for 1 A?

A) $50/99\,\Omega$ in series

B) $50/99\,\Omega$ in parallel

C) $0.01\,\Omega$ in series

D) $0.01\,\Omega$ in parallel

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• question_answer77) The moment of inertia of a body about a given axis is $2.4\,\,kg-{{m}^{2}}$. To produce a rotational kinetic energy of 750 J, an angular acceleration of $5\,rad/{{s}^{2}}$ must be applied about that axis for

A) 6 s

B) 5 s

C) 4 s

D) 3 s

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• question_answer78) A conducting sphere of radius R, and carrying a charge q is joined to a conducting sphere of radius 2R, and carrying a charge - 2q. The charge flowing between them will be

A) $-\frac{q}{3}$

B) $\frac{2q}{3}$

C) $q$

D) $\frac{4q}{3}$

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• question_answer79) The potential at a point due to an electron dipole will be maximum and minimum when the angles between the axis of the dipole and the line joining the point to the dipole are respectively

A) $90{}^\circ \text{ }and\text{ }180{}^\circ$

B) $0{}^\circ \text{ }and\text{ }90{}^\circ$

C) $90{}^\circ \text{ }and\text{ }0{}^\circ$

D) $0{}^\circ \text{ }and\text{ }180{}^\circ$

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• question_answer80) On all the six surfaces of a unit cube, equal tensile force of F is applied. The increase in length of each side will be (Y = Youngs modulus, $\rho$= Poissions ratio)

A) $\frac{F}{Y(1-\sigma )}$

B) $\frac{F}{Y(1+\sigma )}$

C) $\frac{F(1-2\sigma )}{Y}$

D) $\frac{F}{Y(1+2\sigma )}$

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• question_answer81) If the tension on a wire is removed at once, then

A) it will break

B) its temperature will reduce

C) there will be no change in its temperature

D) its temperature increases

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• question_answer82) The electric field due to an electric dipole at a distance r from its centre in axial position is E. If the dipole is rotated through an angle of $90{}^\circ$ about its perpendicular axis, the electric field at the same point will be

A) E

B) $\frac{E}{4}$

C) $\frac{E}{2}$

D) $2E$

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• question_answer83) Among the following properties describing diamagnetism, identify the property that is wrongly stated.

A) Diamagnetic materials do not have permanent magnetic moment

B) Diamagnetism is explained in terms of electromagnetic induction

C) Diamagnetic materials have a small positive susceptibility

D) The magnetic moment of individual electrons neutralize each other

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• question_answer84) Stars are not visible in the day time because

A) stars hide behind the sun

B) stars do not reflect sunrays during day

C) stars vanish during the day

D) atmosphere scatters sunlight into a blanket of extreme brightness through which faint stars cannot be visible

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• question_answer85) If pressure at half the depth of a lake is equal to 2/3 pressure at the bottom of the lake then what is the depth of the lake?

A) 10 m

B) 20 m

C) 60 m

D) 30 m

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• question_answer86) The mass of the moon is$\frac{1}{81}$ of the earth but its gravitational pull is$\frac{1}{6}$of the earth. It is due to the fact that

A) the radius of the moon is $\frac{81}{6}$of the earth

B) the radius of the earth is $\frac{9}{\sqrt{6}}$of the moon

C) moon is the satellite of the earth

D) None of the above

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• question_answer87) A moving coil galvanometer has 48 turns and area of coil is $4\times {{10}^{-2}}{{m}^{2}}$. If the magnetic field is 0.2 T, then to increase the current sensitivity by 25% without changing area (A) and field (B) the number of turns should become

A) 24

B) 36

C) 60

D) 54

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• question_answer88) A magnet is parallel to a uniform magnetic field. If it is rotated by $60{}^\circ$, the work done is 0.8 J. How much work is done in moving it $30{}^\circ$ further?

A) $\text{0}\text{.8 }\!\!\times\!\!\text{ 1}{{\text{0}}^{\text{7}}}\,\text{erg}$

B) 4.0 J

C) 8 J

D) 0.8 erg

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• question_answer89) An electric dipole is put in north-south direction in a sphere filled with water. Which of the following statements is correct?

A) Electric flux is coming towards sphere

B) Electric flux is coming out of sphere

C) Electric flux entering into sphere and leaving the sphere are same

D) Water does not permit electric flux to enter into sphere

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• question_answer90) The plates of parallel plate capacitor are charged upto 100V. A 2 mm thick plate is inserted between the plates. Then to maintain the same potential difference, the distance between the plates is increased by 1.6 mm. The dielectric constant of the plate is

A) 5

B) 1.25

C) 4

D) 2.5

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• question_answer91) The root mean square speed of hydrogen molecules of an ideal hydrogen gas kept in a gas chamber at $0{}^\circ C$ is 3180 m/s. The pressure on the hydrogen gas is (density of hydrogen gas is $8.99\,\times {{10}^{-2}}kg/{{m}^{3}},$ atmosphere $=1.01\,\times {{10}^{5}}\,N/{{m}^{2}}$)

A) 1.0 atm

B) 1.5 atm

C) 2.0 atm

D) 3.0 atm

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• question_answer92) Which of the following is the disadvantage of FM over AM?

A) Larger band width requirement

B) Larger noise

C) Higher modulation power

D) Low efficiency

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• question_answer93) In the adjoining figure, four capacitors are shown with their respective capacities and the PD applied. The charge and the PD across the $4\mu F$ capacitor will be A) $600\,\mu C;\,150\,V$

B) $300\,\mu C;\,75\,V$

C) $800\,\mu C;\,200V$

D) $580\,\mu C;\,145V$

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• question_answer94) What is the angle between the electric dipole moment and the electric field strength due to it on the equatorial line?

A) $0{}^\circ$

B) $90{}^\circ$

C) $180{}^\circ$

D) None of these

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• question_answer95) An electron microscope is superior to an optical microscope in

A) having better resolving power

B) being easy to handle

C) low cost

D) quickness of observation

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• question_answer96) An L-C-R series circuit with a resistance of 100 ft is connected to an AC source of 200 V and angular frequency 300 rad/s. When only the capacitor is removed, the current lags behind the voltage by $60{}^\circ$. When only the inductor is removed the current leads the voltage by $60{}^\circ$ The average power dissipated is

A) 50 W

B) 100 W

C) 200 W

D) 400 W

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• question_answer97) How much work must be done to pull apart the electron and the proton that make up the hydrogen atom, if the atom is initially in the state with n = 2?

A) $\text{13}\text{.6 }\!\!\times\!\!\text{ 1}\text{.6 }\!\!\times\!\!\text{ 1}{{\text{0}}^{\text{-19}}}\text{J}$

B) $\text{3}\text{.6 }\!\!\times\!\!\text{ 1}\text{.6 }\!\!\times\!\!\text{ 1}{{\text{0}}^{\text{-19}}}\text{J}$

C) $\text{1}\text{.51 }\!\!\times\!\!\text{ 1}\text{.6 }\!\!\times\!\!\text{ 1}{{\text{0}}^{\text{-19}}}\text{J}$

D) zero

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• question_answer98) If the current 3 A flowing in the primary coil ii made zero in 0.1 s. The emf induced in the secondary coil is 1.5 V. The mutual inductance between the coils is

A) 0.05 H

B) 1.05 H

C) 0.1 H

D) 0.2 H

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• question_answer99) Radius of the curved road on national highway is R. Width of the road is b. The outer edge of the road is raised by h with respect to inner edge so that a car with velocity v can pass safe over it. The value of h is

A) $\frac{{{v}^{2}}b}{Rg}$

B) $\frac{v}{Rgb}$

C) $\frac{{{v}^{2}}R}{g}$

D) $\frac{{{v}^{2}}b}{R}$

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• question_answer100) What is the (rms) value of an alternating current which when passed through a resistor produces heat which is thrice that of produced by a direct current of 2 A in the same resistor?

A) 6 A

B) 2 A

C) 3.46 A

D) 0.66 A

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• question_answer101) The monomer units of starch are

A) $\alpha -$glucose

B) $\beta -$glucose

C) pyranose

D) galactose

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• question_answer102) The only vitamin with metal atom in it, is

A) vitamin$-A$

B) vitamin$-K$

C) vitamin$-{{B}_{12}}$

D) vitamin$-E$

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• question_answer103) Which of the following is used to make non-stick cookware?

A) PVC

B) Polystyrene

C) Polyethylene terephthalate

D) Polytetrafluoro ethylene

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• question_answer104) Nylon-6 is made from

A) 1, 3-butadiene

B) chloroprene

C) adipic acid

D) carpolactum

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• question_answer105) The functional group which is found in amino acid is

A) $-COOH$

B) $-N{{H}_{2}}$

C) $-C{{H}_{3}}$

D) Both (a) and (b)

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• question_answer106) The units of conductivity are

A) $oh{{m}^{-1}}$

B) $oh{{m}^{-1}}c{{m}^{-1}}$

C) $oh{{m}^{-2}}c{{m}^{2}}equi{{v}^{-1}}$

D) $oh{{m}^{-1}}c{{m}^{2}}$

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• question_answer107) The colloidal system in which the disperse phase and dispersion medium are both liquids is known as

A) a gel

B) an aerosol

C) an emulsion

D) a foam

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• question_answer108) Which of the following is not an ore of magnesium?

A) Gypsum

B) Dolomite

C) Magnesite

D) Carnallite

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• question_answer109) An example of water soluble vitamin is

A) vitamin-D

B) vitamin-E

C) vitamin-A

D) vitamin-C

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• question_answer110) During smelting an additional substance is added which combines with impurities to form a fusible product which is known as

A) mud

B) slag

C) flux

D) gangue

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• question_answer111) Isotonic solutions are the solutions having the same

A) surface tension

B) vapour pressure

C) osmotic pressure

D) viscosity

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• question_answer112) Hydrogen bond is strongest in

A) $S-H\cdot \cdot \cdot \cdot \cdot O$

B) $O-H\cdot \cdot \cdot \cdot \cdot S$

C) $F-H\cdot \cdot \cdot \cdot \cdot F$

D) $O-H\cdot \cdot \cdot \cdot \cdot N$

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• question_answer113) Match List I and List II and pick out correct matching codes from the given choices.

 List I (Compound) List II (Structure) A $Cl{{F}_{3}}$ 1. Square planar B $PC{{l}_{5}}$ 2. Tetrahedral C $I{{F}_{5}}$ 3. Trigonal by pramidal D $CC{{l}_{4}}$ 4. Square pyradimal E $Xe{{F}_{4}}$ 5. T-Shaped

A) $A-5,\,\,B-4,\,\,C-3,\,\,D-2,\,\,E-1$

B) $A-5,\,\,B-3,\,\,C-4,\,\,D-2,\,\,E-1$

C) $A-5,\,\,B-3,\,\,C-4,\,\,D-1,\,\,E-2$

D) $A-4,\,\,B-3,\,\,C-5,\,\,D-2,\,\,E-1$

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• question_answer114) In which of the following pairs, the two species have identical bond order?

A) $N_{2}^{-},\,\,O_{2}^{2-}$

B) $N_{2}^{+},\,\,O_{2}^{-}$

C) $N_{2}^{-},\,\,O_{2}^{+}$

D) $O_{2}^{+},\,\,N_{2}^{2-}$

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• question_answer115) The mass of a photon with wavelength $3.6\,\,\overset{\text{o}}{\mathop{\text{A}}}\,$ is

A) $6.135\times {{10}^{-19}}$

B) $5.6135\times {{10}^{-29}}$

C) $6.100\times {{10}^{-19}}$

D) $6.135\times {{10}^{-29}}$

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• question_answer116) The following compound is used as A) an anti-inflammatory compound

B) analgesic

C) hypnotic

D) antiseptic

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• question_answer117) Presence of a nitro group in a benzene ring

A) renders the ring basic

B) deactivates the ring towards nucleophilic substitution

C) deactivates the ring towards electrophilic substitution

D) activates the ring towards electrophilic substitution

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• question_answer118) Polymer used in bullet proof glass is

A) PMMA

B) lexan

C) nomex

D) Kevlar

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• question_answer119) Which of the following is a pair of isobar?

A) $_{6}{{C}^{13}},\,{{\,}_{7}}{{N}^{13}}$

B) $_{6}{{C}^{13}},\,{{\,}_{7}}{{N}^{14}}$

C) $_{7}{{N}^{14}},\,{{\,}_{8}}{{O}^{16}}$

D) $_{7}{{N}^{13}},\,{{\,}_{8}}{{O}^{18}}$

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• question_answer120) The nitrogen atom has 7 protons and 7 electrons. The nitride ion will have

A) 7 protons and 10 electrons

B) 4 protons and 7 electrons

C) 4 protons and 10 electrons

D) 10 protons and 7 electrons

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• question_answer121) In which of the following the magnetic character is not correct?

A) $CuCl_{4}^{2}-1$unpaired electron

B) $[Fe{{({{H}_{2}}{{O}_{6}}]}^{2+}}-5$unpaired electrons

C) ${{[Zn{{(N{{H}_{3}})}_{2}}]}^{2+}}$Diamagnetic

D) ${{[Co{{F}_{6}}]}^{3-}}-4$unpaired electrons

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• question_answer122) The complex used as an anticancer agent is

A) $mer-[CoC{{l}_{3}}{{(N{{H}_{3}})}_{3}}]$

B) $cis-[PtC{{l}_{2}}{{(N{{H}_{3}})}_{2}}]$

C) $cis-{{K}_{2}}[PtB{{r}_{2}}C{{l}_{2}}]$

D) $N{{a}_{2}}[Co{{(Cl)}_{4}}]$

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• question_answer123) EDTA has coordination number

A) 3

B) 4

C) 5

D) 6

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• question_answer124) 3-pentanol is an example of

A) primary alcohol

B) secondary alcohol

C) tertiary alcohol

D) aromatic alcohol

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• question_answer125) The incorrect IUPAC name is

A) $\underset{\text{2-methyl-3-butanone}}{\mathop{C{{H}_{3}}\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,H-C{{H}_{3}}}}\,$

B) $\underset{2,\,\,3-\text{dimethylpentane}}{\mathop{C{{H}_{3}}\underset{\begin{smallmatrix} || \\ C{{H}_{2}} \end{smallmatrix}}{\mathop{C}}\,H-\underset{\begin{smallmatrix} | \\ C{{H}_{2}}C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,H-C{{H}_{3}}}}\,$

C) $\underset{\text{2-pentyne}}{\mathop{C{{H}_{3}}-C\equiv C-C{{H}_{2}}-C{{H}_{3}}}}\,$

D) $\underset{\text{2-bromo-3-chloro-butane}}{\mathop{C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ Cl \end{smallmatrix}}{\mathop{C}}\,H-\underset{\begin{smallmatrix} | \\ Br \end{smallmatrix}}{\mathop{C}}\,H-C{{H}_{3}}}}\,$

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• question_answer126) Which alkene on ozonolysis gives$C{{H}_{3}}C{{H}_{2}}CHO$ and$C{{H}_{3}}COC{{H}_{3}}$?

A) $C{{H}_{3}}C{{H}_{2}}CH=C{{(C{{H}_{3}})}_{2}}$

B) $C{{H}_{3}}C{{H}_{2}}CH=CHC{{H}_{2}}C{{H}_{3}}$

C) $C{{H}_{3}}C{{H}_{2}}CH=CHC{{H}_{3}}$

D) ${{(C{{H}_{3}})}_{2}}CH=CHC{{H}_{3}}$

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• question_answer127) Isopropyl bromide on Wurtz reaction gives

A) hexane

B) propane

C) 2, 3-dimethylbutane

D) neohexane

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• question_answer128) Which of the following represents the given mode of hybridization$s{{p}^{2}}-s{{p}^{2}}-sp-sp$ from left to right?

A) ${{H}_{2}}C=CH-C\equiv N$

B) $HC\equiv C-C\equiv CH$

C) ${{H}_{2}}C=C=C{{H}_{2}}$

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• question_answer129) $B{{F}_{3}}$is

A) electron-deficient compound

B) Lewis base

C) used as rocket fuel

D) ionic compound

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• question_answer130) $C{{H}_{2}}-\underset{\begin{smallmatrix} || \\ \underset{\centerdot \,\,\,\centerdot }{\mathop{O\,\,\mathbf{:}}}\, \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{3}}$and$C{{H}_{2}}=\underset{\begin{smallmatrix} | \\ \underset{\centerdot \,\,\,\centerdot }{\mathop{\mathbf{:}O\mathbf{:}}}\, \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{3}}$are

A) resonating structures

B) tautomers

C) geometrical isomers

D) optical isomers

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• question_answer131) Fluorobenzene can be synthesized in the laboratory

A) from aniline by diazotization followed by heating the diazonium salt with$HB{{F}_{4}}$

B) by direct fluorination of benzene with ${{F}_{2}}$ gas

C) by reacting bromobenzene with $NaF$ solution

D) by heating phenol with $HF$ and $KF$

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• question_answer132) Glucose reacts with X number of molecules of phenyl hydrazine to yield osazone. The value of$X$is

A) three

B) two

C) one

D) four

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• question_answer133) The wavelength of which series lie towards the ultraviolet

A) Lymann

B) Balmer

C) Paschen

D) None of these

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• question_answer134) A $p-$orbital accommodate maximum

A) 4 electrons

B) 6 electrons

C) 2 electrons with parallel spins

D) 2 electrons with opposite spins

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• question_answer135) Ease of formation of the cation is favoured by

A) lower value of ionization potential

B) lower value of electron affinity

C) higher value of electron affinity

D) lower value of electronegativity

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• question_answer136) What is the mole fraction of solute in $2.5\,\,m$aqueous solution?

A) $0.430$

B) $4.30$

C) $3.40$

D) $0.043$

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• question_answer137) Which of the following carbon atoms is likely to possess tetrahedral geometry? ${{H}_{2}}\overset{4}{\mathop{C}}\,=\overset{3}{\mathop{C}}\,H-\overset{2}{\mathop{C}}\,{{H}_{2}}-\overset{1}{\mathop{C}}\,OOH$

A) 1

B) 2

C) 3

D) 4

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• question_answer138) The compound with an isopropyl group is

A) 2, 2, 3, 3-tetramethylpentane

B) 2, 2-dimethylpentane

C) 2, 2, 3, trimethylpentane

D) 2-methylpentane

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• question_answer139) Borax is used as a cleansing agent because on dissolving in water, it gives

A) alkaline solution

B) acidic solution

C) bleaching solution

D) amphoteric solution

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• question_answer140) Which is strongest Lewis acid?

A) $B{{F}_{3}}$

B) $BC{{l}_{3}}$

C) $BB{{r}_{3}}$

D) $B{{I}_{3}}$

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• question_answer141) Which of the following has maximum unpaired $d-$electrons?

A) $Z{{n}^{2+}}$

B) $F{{e}^{2+}}$

C) $N{{i}^{2+}}$

D) $C{{u}^{+}}$

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• question_answer142) In the reaction $C{{H}_{3}}C{{H}_{2}}COOH\xrightarrow{C{{l}_{2}},\,\,P}X\xrightarrow{alc.\,\,KOH}Y,\,\,Y$is

A) $C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}OH$

B) $C{{H}_{2}}=CHCOOH$

C) $C{{H}_{3}}C{{H}_{2}}CN$

D) $\underset{\begin{smallmatrix} | \\ Cl \end{smallmatrix}}{\mathop{C}}\,{{H}_{2}}C=COOH$

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• question_answer143) Select the $_{p}{{K}_{a}}$ value of the strongest acid.

A) $1.0$

B) $3.0$

C) $2.0$

D) $4.5$

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• question_answer144) Hinsbergs reagent is

A) benzene sulphonyl chloride

B) benzene sulphonic acid

C) phenyl isocyanide

D) benzene sulphonamide

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• question_answer145) Which of the following will not give a primary amine?

A) $C{{H}_{3}}CO{{H}_{2}}\xrightarrow{B{{r}_{2}},\,\,KOH}$

B) $C{{H}_{3}}CN\xrightarrow{LiAl{{H}_{4}}}$

C) $C{{H}_{3}}NHC\xrightarrow{LiAl{{H}_{4}}}$

D) $C{{H}_{3}}CON{{H}_{2}}\xrightarrow{LiAl{{H}_{4}}}$

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• question_answer146) The product formed as a result of reaction of $C{{H}_{3}}MgBr$ and$C{{O}_{2}}$, on further hydrolysis gives

A) $C{{H}_{3}}COOH$

B) $HCOOH$

C) oxalic acid

D) acetic acid

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• question_answer147) The reaction $RC{{H}_{2}}C{{H}_{2}}COOH\xrightarrow[B{{r}_{2}}]{\text{Red}\,\,P}RC{{H}_{2}}\underset{\begin{smallmatrix} | \\ Br \end{smallmatrix}}{\mathop{C}}\,HCOOH$

A) Reimer-Tiemann reaction

B) Hell Volhard Zelinsky reaction

C) Cannizaros reaction

D) Sandmeyers reaction

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• question_answer148) Which of the following compound is most reactive towards nucleophilic addition reaction?

A) Ethanal

B) Propanal

C) Butanone

D) Propanone

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• question_answer149) For an equilibrium reaction, the rate constants for the forward and the backward reaction are $2.38\times {{10}^{-4}}$ and $8.15\times {{10}^{-5}}$ respectively. What will be the equilibrium constant for the reaction?

A) $92.2$

B) $29.2$

C) $20.2$

D) $2.92$

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• question_answer150) Which acid is present in vinegar?

A) Hydrochloric acid

B) Acetic acid

C) Citric acid

D) Tartaric acid

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• question_answer151) Which one of the following types of drugs reduces fever?

A) Analgesics

B) Antipyretics

C) Aspirin

D) Tranquillizers

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• question_answer152) In$HCO{{O}^{-}}$, the two carbon-oxygen bonds are found to be of equal length. What is the reason for this?

A) The anion is obtained by the removal of a proton from the acid molecule

B) Electronic orbitals of carbon atoms are hybridized

C) The $C=O$ bond is weaker than $C-O$ bond

D) The anion $HCO{{O}^{-}}$ has two resonating Structures

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• question_answer153) In a set of reactions, acetic acid yielded product $D.C{{H}_{3}}COOH\xrightarrow{SOC{{l}_{2}}}A\xrightarrow[Anhy.\,\,AlC{{l}_{3}}]{Benzene}$$B\xrightarrow{HCN}C\xrightarrow{HOH}D$. The structure of$D$would be

A) B) C) D) View Answer play_arrow
• question_answer154) How many bonds are there in A) $14\sigma ,\,\,8\pi$

B) $18\sigma ,\,\,8\pi$

C) $19\sigma ,\,\,4\pi$

D) $14\sigma ,\,\,2\pi$

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• question_answer155) Principal, azimuthal and magnetic quantum numbers are respectively related to

A) size, orientation and shape

B) size, shape and orientation

C) shape, size and orientation

D) None of the above

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• question_answer156) Paulis exclusion principle states that

A) the nucleus of an atom is negatively charged

B) electrons revolve around the nucleus in circular orbits

C) electrons enter into lowest energy orbitals

D) no two electrons in an atom can have all the four quantum numbers identical

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• question_answer157) The geometry of $XeO{{F}_{2}}$ is

A) pyramidal

B) T-shaped

C) octahedral

D) tetrahedral

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• question_answer158) The noble gas compound prepared by Harriett was

A) $Xe{{O}_{3}}$

B) $XePt{{F}_{6}}$

C) $Kr{{F}_{2}}$

D) $Xe{{F}_{2}}$

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• question_answer159) Which of the following has highest ionization enthalpy?

A) $P$

B) $N$

C) $As$

D) $Sb$

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• question_answer160) $X$ is heated with soda lime and gives ethane. $X$ is

A) ethanoic acid

B) methanoic acid

C) propanoic acid

D) Either (a) or (c)

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• question_answer161) The correct order regarding the electronegativity of hybrid orbitals of carbon is

A) $sp<s{{p}^{2}}>s{{p}^{3}}$

B) $sp<s{{p}^{2}}<s{{p}^{3}}$

C) $sp>s{{p}^{2}}<s{{p}^{3}}$

D) $sp>s{{p}^{2}}>s{{p}^{3}}$

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• question_answer162) Which of the following gas mixture is used by the divers inside the sea?

A) ${{O}_{2}}+He$

B) ${{O}_{2}}+Xe$

C) ${{O}_{2}}+Ar$

D) ${{O}_{2}}+{{N}_{2}}$

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• question_answer163) The laughing gas is

A) nitrogen oxide

B) nitric oxide

C) nitrogen trioxide

D) nitrogen pentoxide

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• question_answer164) The number of nodal plane $5\,\,d$ orbital has is

A) zero

B) one

C) two

D) three

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• question_answer165) The atomic number of $Ni$ and $Cu$ are $28$ and $29$ respectively. The electronic configuration$1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}3{{d}^{10}}$ represents

A) $Ni$

B) $N{{i}^{2+}}$

C) $C{{u}^{2+}}$

D) $C{{u}^{+}}$

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• question_answer166) How many ions are produced from$[Co{{(N{{H}_{3}})}_{6}}]C{{l}_{3}}$in solution?

A) $6$

B) $4$

C) $3$

D) $2$

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• question_answer167) Among the alkali metals, cesium is the most reactive because

A) its incomplete shell is nearest to the nucleus

B) its has a single electron in the valence shell

C) it is the heaviest alkali metal

D) the outermost electron is more loosely bound than the outermost electron of the other alkali metals

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• question_answer168) The ionic mobility of alkali metal ions in aqueous solution is maximum for

A) ${{K}^{+}}$

B) $R{{b}^{+}}$

C) $L{{i}^{+}}$

D) $N{{a}^{+}}$

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• question_answer169) Gypsum on heating to $390\,\,K$ gives

A) $CaS{{O}_{4}}\cdot 2{{H}_{2}}O$

B) $CaS{{O}_{4}}$

C) $CaS{{O}_{4}}\cdot \frac{1}{2}{{H}_{2}}O$

D) $S{{O}_{3}}$and$CaO$

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• question_answer170) Epsom salt is

A) $MgS{{O}_{4}}\cdot 7{{H}_{2}}O$

B) $CaS{{O}_{4}}\cdot {{H}_{2}}O$

C) $MgS{{O}_{4}}\cdot 2{{H}_{2}}O$

D) $BaS{{O}_{4}}\cdot 2{{H}_{2}}O$

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• question_answer171) The temperature at which $28\,\,g$ of ${{N}_{2}}$ will occupy a volume of $10.0\,\,L$ at$2.46\,\,atm$

A) $299.6\,\,K$

B) ${{0}^{o}}C$

C) $273\,\,K$

D) ${{10}^{o}}C$

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• question_answer172) Para and ortho hydrogen differ in

A) atomic number

B) atomic mass

C) spins of protons

D) number of neutrons

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• question_answer173) Atomic orbitals of carbon in carbon dioxide are

A) $sp-$hybridized

B) $s{{p}^{3}}d-$hybridized

C) $s{{p}^{2}}-$hybridized

D) $s{{p}^{3}}-$hybridized

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• question_answer174) The appearance of colour in solid alkali metal halides is generally due to

A) Schottky defect

B) Frenkel defect

C) Interstitial position

D) $F-$centres

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• question_answer175) Which among the following factors is most important in making fluorine the strongest oxidizing agent?

A) Electron gain enthalpy

B) Ionization enthalpy

C) Hydration enthalpy

D) Bond dissociation enthalpy

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• question_answer176) How many coulombs are required to deposit $50\,\,g$ of aluminium when the electrode reaction is $A{{l}^{3+}}+3{{e}^{-}}\xrightarrow{{}}Al$

A) $536111\,\,C$

B) $536.111\,\,C$

C) $96500\,\,C$

D) $38600\,\,C$

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• question_answer177) In$Cu\,\,(At.\,\,No.29)$

A) 13 electrons have spin in one direction and 16 electrons in other direction

B) 14 electrons have spin one direction and 15 electrons in other direction

C) one electron can have spin only in the clockwise direction

D) None of the above is correct

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• question_answer178) The boiling point of water is${{100}^{o}}C$. What will be the boiling point of an aqueous solution containing $0.6\,\,g$ of urea (molar mass$=60$) in $100\,\,g$ of water?(${{K}_{b}}$for water$=0.52\,\,K/m$)

A) ${{100.052}^{o}}C$

B) ${{101.052}^{o}}C$

C) ${{120.52}^{o}}C$

D) None of these

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• question_answer179) Sodium metal crystallizes in body centred cubic lattice with cell edge$4.29\overset{\text{o}}{\mathop{\text{A}}}\,$ . What is the radius of sodium atom?

A) $2.86\,\,\overset{\text{o}}{\mathop{\text{A}}}\,$

B) $6.81\,\,\overset{\text{o}}{\mathop{\text{A}}}\,$

C) $1.68\,\,\overset{\text{o}}{\mathop{\text{A}}}\,$

D) $1.86\,\,\overset{\text{o}}{\mathop{\text{A}}}\,$

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• question_answer180) Hydrogen sulphide is acidic while water is neutral. The reason is

A) molecular weight of ${{H}_{2}}S$ is more than ${{H}_{2}}O$

B) water molecules associate, while ${{H}_{2}}S$ molecules do not

C) $H-S$bond is weaker than $H-O$ bond due to the bigger size of $S-$atom

D) S-atoms has less affinity for hydrogen atom than $O$ atom has for it

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• question_answer181) Percentage of cation in ammonium dichromate ${{(N{{H}_{4}})}_{2}}C{{r}_{2}}{{O}_{7}}$ is

A) $41.29%$

B) $14.29%$

C) $20.29%$

D) None of these

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• question_answer182) Identify the compounds $A$ and $B$ in the following reaction sequence. $Ca{{C}_{2}}(s)+{{H}_{2}}O(l)\xrightarrow{{}}A(g)\xrightarrow[HgS{{O}_{4}}]{{{H}_{2}}S{{O}_{4}}}B(l)$

A) $A$is ethylene, $B$ is acetaldehyde

B) $A$is acetylene, $B$ is propionaldehyde

C) $A$is ethane, $B$ is ethanol

D) $A$is acetylene, $B$ is acetaldehyde

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• question_answer183) The compound formed in the positive test for nitrogen with the Lassaigne solution of an organic compound is

A) $F{{e}_{4}}{{[Fe(C{{N}_{6}})]}_{3}}$

B) $N{{a}_{3}}[Fe{{(CN)}_{6}}]$

C) $Fe{{(CN)}_{3}}$

D) $N{{a}_{4}}[Fe{{(CN)}_{5}}COS]$

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• question_answer184) The arrangement of${{(C{{H}_{3}})}_{3}}C-,\,\,{{(C{{H}_{3}})}_{2}}CH-,$$C{{H}_{3}}C{{H}_{2}}-$when attached to benzene or unsaturated group in increasing order of inductive effect is

A) ${{(C{{H}_{3}})}_{3}}C-<{{(C{{H}_{3}})}_{3}}CH-<C{{H}_{3}}C{{H}_{2}}-$

B) $C{{H}_{3}}C{{H}_{2}}-<{{(C{{H}_{3}})}_{2}}CH-<{{(C{{H}_{3}})}_{3}}C-$

C) ${{(C{{H}_{3}})}_{2}}CH-<{{(C{{H}_{3}})}_{3}}C-<C{{H}_{3}}C{{H}_{2}}-$

D) ${{(C{{H}_{3}})}_{3}}C-<C{{H}_{3}}C{{H}_{2}}-<{{(C{{H}_{3}})}_{2}}CH-$

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• question_answer185) Pieces of wood burn faster than a log of wood of the same mass because

A) surface area of log of wood is larger and needs more time to burn

B) pieces of wood have large surface area

C) all pieces of wood catch fire at the same time

D) block of wood has higher density than pieces of the same wood

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• question_answer186) Bravais lattices are of

A) 8 types

B) 9 types

C) 12 types

D) 14 types

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• question_answer187) In the following nuclear reaction, the other product is $_{52}T{{e}^{130}}{{+}_{1}}{{H}^{2}}{{\xrightarrow{{}}}_{53}}{{I}^{131}}+?$

A) positron

B) one neutron

C) proton

D) alpha particle

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• question_answer188) The number of a and p-particles emitted in the nuclear reaction $_{90}T{{h}^{228}}{{\xrightarrow{{}}}_{83}}B{{i}^{212}}$are

A) $4\alpha$and$1\beta$

B) $3\alpha$and$7\beta$

C) $8\alpha$and$1\beta$

D) $4\alpha$and$7\beta$

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• question_answer189) Schottky defect in crystals is observed when

A) density of crystal is increased

B) an ion leaves its normal site and occupies an interstitial site

C) equal number of cations and anions are missing from the lattice

D) unequal number of cations and anions are missing from the lattice

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• question_answer190) What happens when an egg is kept in saturated solution of $NaCl$ after removing its hard shell in$dil\,\,HCl$?

A) Egg will swell

B) Egg will shrink

C) Egg will remain same

D) Egg will first shrink and then swell

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• question_answer191) Which of the following is the expression of Raoults law? ($p=$vapour pressure of pure solvent, ${{p}_{s}}=$vapour pressure of the solution)

A) $\frac{p-{{p}_{s}}}{p}=\frac{n}{n+N}$

B) $\frac{{{p}_{s}}-p}{p}=\frac{N}{N+n}$

C) $\frac{p-{{p}_{s}}}{{{p}_{s}}}=\frac{N}{N-n}$

D) $\frac{{{p}_{s}}-p}{{{p}_{s}}}=\frac{N-n}{N}$

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• question_answer192) A catalyst alter the rate of reaction by

A) altering enthalpy

B) altering internal energy

C) altering energy of activation

D) All of the above

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• question_answer193) The noble gas which can diffuse through rubber and glass easily is

A) $Xe$

B) $Ne$

C) $Ar$

D) $He$

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• question_answer194) Among the following molecule

 (i) $Xe{{O}_{3}}$ (ii)$Xe{{O}_{4}}$ (iii)$Xe{{F}_{6}}$
those having same number of lone pairs on$Xe$ are

A) (i) and (iii) only

B) (i) and (ii) only

C) (ii) and (iii) only

D) (i), (ii) and (iii)

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• question_answer195) In the following halogen compounds, which compound undergoes fastest ${{S}_{N}}1$ reaction?

 (i) (ii) (iii) A) (i)

B) (ii)

C) (iii)

D) None of these

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• question_answer196) $UV$radiations brings about

A) skin cancer

B) mouth cancer

C) lung cancer

D) liver cancer

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• question_answer197) Sublimation is a process in which a solid

A) changes into vapour form

B) changes into another allotropic form

C) changes into liquid form

D) None of the above

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• question_answer198) Pollution is

A) removal of top soil

B) release of toxic/undesirable materials in environment

C) conservation of energy

D) All of the above

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• question_answer199) Gas released during Bhopal tragedy was

A) methyl isocyanate

B) potassium isothiocyanate

C) sodium isothiocyanate

D) ethyl isothiocyanate

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• question_answer200) In$AgBr$, these can occur

A) Only Schottky defect

B) Only Frenkel defect

C) Both (a) and (b)

D) None of the above

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• question_answer201) Plasmodesmata connections help in

A) cytoplasmic streaming

B) synchronous mitotic divisions

C) locomotion of unicellular organisms

D) movement of substances between cells

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• question_answer202) The quiescent centre in root meristem serves as

A) site for storage of food, which is utilized during maturation

B) reservoir of growth hormones

C) reserve for replenishment of damaged cells of the meristem

D) region for absorption of water

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• question_answer203) Azolla is used as a biofertilizer because it

A) multiplies very fast to produce massive biomass

B) has association of nitrogen-fixing Rhizobium

C) has association of nitrogen-fixing cyanobacteria

D) has association of mycorrhiza

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• question_answer204) A person is wearing spectacles with concave lenses for correcting vision. While not using the glasses, the image of a distant object in his case will be formed

A) on the blind spot

B) behind the retina

C) in front of the retina

D) on the yellow spot

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• question_answer205) Which one of the following codon codes for the same information as UGC?

A) UGU

B) UGA

C) UAG

D) UGG

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• question_answer206) People recovering from long illness are often advised to include the alga Spirulina in their diet because it

A) makes the food easy to digest

B) is rich in proteins

C) has antibiotic properties

D) restores the intestinal microflora

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• question_answer207) The phase of menstrual cycle in humans that lasts for 7-8 days is

A) follicular phase

B) ovulatory phase

C) luteal phase

D) menstruation

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• question_answer208) Restriction enzymes

A) are endonucleases, which cleave DNA at specific sites

B) make DNA complementary to an existing DNA or RNA

C) cut or join DNA fragments

D) are required in vector less direct gene transfer

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• question_answer209) Excessive stimulation of vagus nerve in humans may lead to

A) hoarse voice

B) peptic ulcers

C) efficient digestion of proteins

D) irregular contraction of diaphragm

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• question_answer210) An example of competitive inhibition of an enzyme is the inhibition of

A) succinic dehydrogenase by malonic acid

B) cytochrome oxidase by cyanide

C) hexokinase by glucose-6-phosphate

D) carbonic anhydrase by carbon dioxide

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• question_answer211) A person passes much urine and drinks much water but his blood glucose level is normal. This conditions may be the result of

A) a reduction in insulin secretion from pancreas

B) a reduction in vasopressin secretion from posterior pituitary

C) a fall in the glucose concentration in urine

D) an increase in secretion of glucagon

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• question_answer212) Biological Oxygen Demand (BOD) is a measure of

A) industrial wastes poured into water bodies

B) extent to which water is polluted with organic compound

C) amount of carbon monoxide inseparably combined with haemoglobin

D) amount of oxygen needed by green plants during night

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• question_answer213) Somaclonal variation is seen in

A) tissue culture grown plants

B) apomicts

C) polyploids

D) vegetatiely propagated plants

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• question_answer214) Among rust, smut and mushroom, all the three

A) are pathogens

B) are saprobes

C) bear ascocarps

D) bear basidiocarps

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• question_answer215) In prokaryotes, chromatophores are

A) specialized granules responsible for coloration of cells

B) structures responsible for organizing the shape of the organism

C) incusion bodies lying free inside the cells for carrying out various metabolic activities

D) internal membrane systems that may become extensive and complex in photosynthetic bacteria

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• question_answer216) A scion is grafted to a stock. The quality of fruits produced will be determined by the genotype of

A) stock

B) scion

C) Both (a) and (b)

D) Neither (a) nor (b)

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• question_answer217) The Montreal Protocol refers to

A) persistent organic pollutants

B) global warming and climate change

C) substances that deplete the ozone layer

D) biosafety of genetically modified organisms

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• question_answer218) Keystone species deserve protection because these

A) are capable of surviving in harsh environmental conditions

B) Indicate presence of certain minerals in the soil

C) have become rare due to over exploitation

D) play an important role in supporting other species

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• question_answer219) Grafting is successful in dicots but not in monocots because the dicots have

A) vascular bundles arranged in a ring

B) cambium for secondary growth

C) vessels with elements arranged end to end

D) cork cambium

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• question_answer220) In the sieve elements, which one of the following is the most likely function of P-proteins?

A) Deposition of callose on sieve plates

B) Providing energy for active translocation

C) Autolyric enzymes

D) Sealing off mechanism on wounding

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• question_answer221) A normal woman whose father was colurblind, is married to a normal man. The sons would be

A) 75% colourblind

B) 50% colourblind

C) all normal

D) all colourblind

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• question_answer222) Which one of the following precedes re-formation of the nuclear envelope during M phase of the cell cycle?

A) Decondensation from chromosomes and reassembly of the nuclear lamina

B) Transcription from chromosome and reassembly of the nuclear lamina

C) Formation of the contractile ring and formation of the phragmoplast

D) Formation of the contractile ring and transcription from chromosomes

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• question_answer223) The type of epithelial cells, which line the inner surface of Fallopian tubes, bronchioles and small bronchi, are known as

A) squamous epithelium

B) columnar epithelium

C) ciliated epithelium

D) cubical epithelium

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• question_answer224) Which one of the following pairs is correctly matched?

A) Rhizobium -Parasite in the roots of leguminous plants

B) Mycorrhizae - Mineral uptake from soil

C) Yeast - Production of biogas

D) Myxomycetes - The disease ringworm

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• question_answer225) A cricket player is fast chasing a ball in the field. Which one of the following groups of bones are directly contributing in this movement?

A) Femur, malleus, tibia, metatarsals

B) Pelvis, ulna, patella, tarsals

C) Sternum, femur, tibia, fibula

D) Tarsals, femur, metatarsals, tibia

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• question_answer226) Viruses that infect bacteria multiply and cause their lysis, are called

A) lysozymes

B) lipolytic

C) lyric

D) lysogenic

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• question_answer227) Pollution from animal excreta and organic waste from kitchen can be most profitably minimized by

A) storing them in underground storage tanks

B) using them for producing biogas

C) vermiculture

D) using them directly as bio-fertilizers

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• question_answer228) Mating of an organism to a double recessive in order to determine whether it is homozygous or heterozygous for a character under consideration is called

A) reciprocal cross

B) test cross

C) dihybrid cross

D) back cross

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• question_answer229) Which one of the following pairs of features is a good example of polygenic inheritance?

A) Human height and skin colour

B) ABO blood group in humans and flower colour of Mirabilis jalapa

C) Hair pigment of mouse and tongue rolling in humans

D) Human eye colour and sickle cell anaemia

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• question_answer230) A lizard-like member of Reptilia is string on a tree with its tail coiled around a twig. This animal could be

A) Hemidactylus showing sexual dimorphism

B) Varanus showing mimicry

C) Calotes (garden lizard) showing camouflage

D) Chamaeleon showing protective colouration

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• question_answer231) All mammals without any exception are characterised by

A) vivipariry and biconcave red blood cells extra

B) abdominal tests and a four-chambered heart

C) heterodont teeth and 12 pairs of cranial nerves

D) a muscular diaphragm and milk producing glands

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• question_answer232) During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric charge?

A) First negative, then positive and again back to negative

B) First positive, then negative and continue to be negative

C) First negative, then positive and continue to be positive

D) First positive, then negative and again back to positive

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• question_answer233) If you are asked to classify the various algae into distinct groups, which of the following characters you should choose?

A) Types of pigments present in the cell

B) Nature of stored food materials in the cell

C) Structure organization of thallus

D) Chemical composition of the cell wall

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• question_answer234) A plant require magnesium (Mg) for

A) holding cells together

B) protein synthesis

C) chlorophyll synthesis

D) cell wall development

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• question_answer235) Ultrasound of how much frequency is beamed into human body for sonography?

A) 30 to 45 MHz

B) 15 to 30 MHz

C) 1 to 5 MHz

D) 45 to 70 MHz

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• question_answer236) Which one of the following pairs of structures distinguished a nerve cell from other types of cell?

A) Perikaryon and dendrites

B) Vacuoles and fibres

C) Flagellum and medullary sheath

D) Nucleus and mitochondria

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• question_answer237) All enzymes of TCA cycle are located in the mitochondrial matrix except one, which is located in inner mitochondrial membranes in eukaryotes and in cytosol in prokaryotes. This enzyme is

A) lactate dehydrogenase

B) isocitrate dehydrogenase

C) malate dehydrogenase

D) succinate dehydrogenase

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• question_answer238) When two species of different genealogy come to resemble each other as a result of adaptation the phenomenon is termed as

A) divergent evolution

B) microevolution

C) co-evolution

D) convergent evolution

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• question_answer239) Which one of the following is a matching pair of a body feature and the animal possessing it?

A) Post-anal tail - Octopus

B) Ventral central nervous - Leech system

C) Pharyngeal gills slits absent - Chamaeleon m embryo

D) Ventral heart - Scorpion

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• question_answer240) Bowmans glands are located in the

A) proximal end of uriniferous tubules

B) anterior pituitary

C) female reproductive system of cockroach

D) olfactory epithelium of our nose

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• question_answer241) Which one of the following pairs, is not correctly matched?

A) Abscisic acid - Stomatal closure

B) Gibberellic acid - Leaf fall

C) Cytokinin - Cell division

D) IAA - Cell wall elongation

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• question_answer242) Which one of the following element is not an essential micronutrient for plant growth?

A) Manganese

B) Zinc

C) Copper

D) Calcium

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• question_answer243) Two cells A and B are contiguous. Cell A has osmotic pressure 10 at m, turgor pressure-7 at m and diffusion pressure deficit 3 at m. Cell B has osmotic pressure 8 at m, turgor pressure 3 at m and diffusion pressure deficit 5 atm. The result will be

A) movement of water from cell B to A

B) no movement of water

C) equilibrium between the two

D) movement of water from cell A to B

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• question_answer244) Which one of the following is surrounded by a callose wall?

A) Microspore mother cell

B) Male gemete

C) Egg

D) Pollen grain

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• question_answer245) Male gametes in angiosperms are formed by the division of

A) microspore

B) generative cell

C) vegetative cell

D) microspore mother cell

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• question_answer246) Which one of the following is not a bioindicator of water pollution?

A) Sludge-worm

B) Blood-worm

C) Stone fly

D) Sewage fungus

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• question_answer247) Differentiation of organs and tissues in a developing organism, is associated with

A) development mutations

B) differential expression of genes

C) lethal mutations

D) deletion of genes

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• question_answer248) Industrial melanism as observed in peppered moth proves that

A) the true black melanic form arise by a recurring random mutation

B) the melanic form of the moth has no selective advantage over lighter form in industrial area

C) the lighter-form moth has no selective advantage either in polluted industrial area or non-polluted area

D) melanism is a pollution-generated feature

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• question_answer249) A genetically engineered microorganism used successfully in bioremediation of oil spills is a species of

A) Pseudomonas

B) Trichoderma

C) Xanthomonas

D) Bacillus

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• question_answer250) About 96 per cent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen,

A) phosphorus and sulphur

B) sulphur and magnesium

C) magnesium and sodium

D) calcium and phosphorus

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• question_answer251) Which one of the following pairs is mismatched?

A) Pila globosa - Pearl

B) Apis indica - Honey

C) Kenia lacca - Lac

D) Bombyx mori - Silk

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• question_answer252) In which one of the following preparations, are you likely to come across cell junctions most frequently?

A) Ciliated epithelium

B) Thrombocytes

C) Tendon

D) Hyaline cartilage

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• question_answer253) A person who is on a long hunger strike and is surviving only on water, will have

A) more sodium in his urine

B) less amino acids in his urine

C) more glucose in his blood

D) less urea in his urine

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• question_answer254) Which pair of the following belongs to Basidiomycetes?

A) Birds nest fungi and puff balls

B) Puffballs and Claviceps

C) Peziza and stink horns

D) Morchella and mushrooms

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• question_answer255) Spore dissemination in some liverworts is aided by

A) elaters

B) indusium

C) calyptra

D) peristome teeth

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• question_answer256) Which one of the following human activities would cause least damage to the ecosystem?

A) Organic farming

B) Shirting agriculture

C) Urban expansion

D) Cultivation of gentically engineered plants

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• question_answer257) The Okazaki fragments in DNA chain growth

A) result in transcription

B) polymerize in the 3 to 5 direction and forms replication fork

C) prove semi-conservative nature of DNA replication

D) polymerize in the 5 to 3 direction and explain 3 to 5 DNA replication

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• question_answer258) Opening of floral buds into flowers is a type of

A) autonomic movement of locomotion

B) autonomic movement of variation

C) paratonic movement of growth

D) autonomic movement of growth

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• question_answer259) One gene-one enzyme relationship was established for the first time in

A) Neurospora crassa

B) Salmonella typhimurium

C) Escherichia coli

D) Diplococcus pneumonia

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• question_answer260) One of the important consequences of geographical isolation is

A) no change in the isolated fauna

B) preventing speciation

C) speciation through reproductive isolation

D) random creation of new species

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• question_answer261) The first acceptor of electrons from an excited chlorophyll molecule of photosystem-II is

A) cytochrome

B) iron-sulphur protein

C) ferredoxin

D) quinine

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• question_answer262) Which of the following ecosystem type has the highest annual net primary productivity?

A) Tropical rainforest

B) Tropical deciduous forest

C) Temperate evergreen forest

D) Temperate deciduous forest

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• question_answer263) Lysozyme that is present in perspiration, saliva and tears, destroys

A) certain fungi

B) certain types of bacteria

C) all viruses

D) most virus-infected cells

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• question_answer264) Inheritance of skin colour in humans is an example of

A) chromosomal aberration

B) point mutation

C) polygenic inheritance

D) codominance

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• question_answer265) In the leaves of ${{C}_{4}}$-plants, malic acid formation during $C{{O}_{2}}$ fixation occurs in the cells of

A) mesophyll

B) bundle sheath

C) phloem

D) epidermis

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• question_answer266) Which of the following is a slime mould?

A) Rhizopus

B) Physarum

C) Thiobadllus

D) Anabaena

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• question_answer267) Which one of the following is not a constituent of cell membrane?

A) Cholesterol

B) Glycolipids

C) Proline

D) Phospholipids

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• question_answer268) The concept of chemical evolution is based on

A) crystallization of chemicals

B) interaction of water, air and clay under intense heat

C) effect of solar radiation on chemicals

D) possible origin of life by combination of chemicals under suitable environmental conditions

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• question_answer269) Which part of ovary in mammals acts as an endocrine gland after ovulation?

A) Graafian follicle

B) Stroma

C) Germinal epithelium

D) Vitelline membrane

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• question_answer270) If you suspect major deficiency of antibodies in a person, to which of the following would you look for confirmatory evidence?

A) Serum albumins

B) Serum globulins

C) Fibrinogen in the plasma

D) Haemocytes

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• question_answer271) In the prothallus of a vascular cryptogam, the antherozoids and eggs mature at different times. As a result

A) there is no change in success rate of fertilization

B) there is high degree of sterility

C) one can conclude that the plant is apomictic

D) Self-fertilization is prevented

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• question_answer272) In gymnosperms, the pollen chamber represents

A) a cell in the pollen grain in which the sperms are formed

B) a cavity in the ovule in which pollen grains are stored after pollination

C) an opening in the megagametophyte through which the pollen tube approaches the egg

D) the microsporangium in which pollen grains develop

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• question_answer273) One of endangered species of Indian medicinal plants is that of

A) Podophyllum

B) Ocimum

C) Garlic

D) Nepenthes

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• question_answer274) In the hexaploid wheat, the haploid (n) and basic (x) numbers of chromosomes are

A) n = 7 and x = 21

B) n = 21 and x = 21

C) n = 21 and x = 14

D) n = 21 and x = 7

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• question_answer275) Which one of the following is a viral disease of poultry?

A) Salmonellosis

B) Coryza

C) New castle disease

D) Pasteurellosis

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• question_answer276) During transcription, RNA polymerase holoenzyme binds to a gene promoter and assumes a saddle-like structure. What is its DNA-binding sequence?

A) TTAA

B) AATT

C) CACC

D) TATA

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• question_answer277) In maize, hybrid vigour is exploited by

A) bombarding the seeds with DNA

B) crossing of two inbred parental lines

C) harvesting seeds from the most productive plants

D) inducing mutations

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• question_answer278) What is true about Nereis, scorpion, cockroach and silver fish?

A) They all have jointed paired appendages

B) They all possess dorsal heart

C) None of them is aquatic

D) They all belong to the same phylum

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• question_answer279) Ergot of rye is caused by a species of

A) Phycophthora

B) Uncinula

C) Ustilago

D) Claviceps

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• question_answer280) Among the human ancestors, the brain size was more than 1000 cc in

A) Homo neanderthalensis

B) Homo erectus

C) Ramapichecus

D) Homo habilis

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• question_answer281) The wavelength of light absorbed by ${{P}_{r}}$ form of phytochrome is

A) 640 nm

B) 680 nm

C) 720 nm

D) 620 nm

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• question_answer282) A person is having problems with calcium and phosphorus metabolism in his body. Which one of the following glands may not be functioning properly?

A) Parathyroid

B) Parotid

C) Pancreas

D) Thyroid

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• question_answer283) Which one of the following is being utilized as a source of bio-diesel in the Indian countryside?

A) Euphorbia

B) Beetroot

C) Sugarcane

D) Pongamia

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• question_answer284) Foolish seedling disease of rice led to the discovery of

A) GA

B) ABA

C) 2, 4-D

D) IAA

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• question_answer285) Consider the following four statements (I-IV) about certain desert animals such as kangaroo rat.

 I. They have dark colour high rate of reproduction and excrete solid urine. II. They do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hairs. III. They feed on dry seeds and do not require drinking water. IV. They excrete very concentrated urine and do not use water to regulate body temperature
Which two of the above statements for such animals are true?

A) III and IV

B) II and III

C) III and I

D) I and II

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• question_answer286) In DNA molecule

A) the total amount of purine nucleotides and pyrimidine nucleotides is not always equal

B) there are two strands, which run parallel in the $5\to 3$ direction

C) the proportion of adenine in relation to thymine varies with the organism

D) there are two strands, which run antiparallel-one in $5\to 3$ direction and other in $3\to 5$

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• question_answer287) Which one of the following is incorrect about the characteristics of protobionts (coacervates and microspheres) as envisaged in the abiogenic origin of life?

A) They were able to reproduce

B) They could separate combinations of molecules from the surroundings

C) They were partially isolated from the surroundings

D) They could maintain an internal environment

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• question_answer288) Which one of the following pair of items correctly belongs to the category of organs mentioned against it?

A) Thorns of-Analogous organs Bougainvillea and tendrils of Cucurbita

B) Nictitating-Vestigial organs membrane and blind spot in human eye

C) Nephridia of- Excretory organs earthworm and Malpighian tubules of cockroach

D) Wings of honey bee-Homologous organs and wings of crow

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• question_answer289) Which one of the following phyla is correctly matched with its two general characteristics?

A) Arthropoda-Body divided into head, thorax and abdomen and respiration by tracheae

B) Chordata-Notochord at some stage and separate anal and urinary openings to the outside

C) Echinoder-Pentamerous radial mata symmetry and mostly internal fertilization

D) Mollusca - Normally oviparous and development through a trochophore or veliger larva

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• question_answer290) Wobble nypothesis was given by

A) FHC Crick

B) Nirenberg

C) Holley

D) Khurana

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• question_answer291) Ascaris is characterized by

A) absence of true coelom but presence of metamerism

B) presence of neither true coelom nor metamerism

C) presence of true coelom but absence of metamerism

D) presence of true coelom and metamerism (metamerisation)

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• question_answer292) A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this.

 I. Lots of urea and phosphate fertilizer were used in the crops in the vicinity. II. The area was sprayed with DDT by an aircraft. III. The lake water turned green and stinky. IV. Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis.
Which two of the above were the main causes of fish mortality in the lake?

A) II, III

B) III, IV

C) I, III

D) I, II

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• question_answer293) Trichoderma harzianum has proved a useful microorganism for

A) bioremediation of contaminated soils

B) reclamation of wastelands

C) gene transfer in higher plants

D) biological control of soil-borne plant pathogens

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• question_answer294) Quercus species are the dominant component in

A) temperate deciduous forests

B) alpine forests

C) scrub forests

D) tropical rain forests

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• question_answer295) A transgenic food crop, which may help in solving the problem of night blindness in developing countries is

A) Flavr savr tomatoes

B) Starlink maize

C) Bt soybean

D) golden rice

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• question_answer296) Which one of the following pairs of plants structures has haploid number of chromosomes?

A) Megaspore mother cell and antipodal cells

B) Egg cell and antipodal cells

C) Nucellus and antipodal cells

D) Egg nucleus and secondary nucleus

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• question_answer297) Gel electrophoresis is used for

A) cutting of DNA into fragments

B) separation of DNA fragments according to their size

C) construction of recornbinant DNA by joining with cloning vectors

D) isolation of DNA molecule

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• question_answer298) Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in

A) vessels and tracheid differentiation

B) leaf abscission

C) annual plants

D) floral parts

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• question_answer299) What will happen if the secretion of parietal cells of gastric gland is blocked with an inhibitor?

A) Gastric juice will be deficient in chymosin

B) Gastric juice will be deficient in pepsinogen

C) In the absence of HCl secretion, inactive pepsinogen is not converted into the active enzyme pepsin

D) Enter kinase will not be released from the duodenal mucosa and so trypsinogen is not converted to trypsin

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• question_answer300) The length of different internodes in a culm of sugarcane is variable because of

A) shoot apical meristem

B) position of axillary buds

C) size of leaf lamina at the node below each internode

D) intercalary meristem

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