# Solved papers for RAJASTHAN PMT Rajasthan - PMT Solved Paper-2008

### done Rajasthan - PMT Solved Paper-2008

• question_answer1) A ball is thrown from a point with a speed ${{v}_{0}}$ at an angle of projection$\theta$. From the same point and at the same instant, a person starts running with a constant speed$\frac{{{v}_{0}}}{2}$ to catch the ball. Will the person be able to catch the ball If yes, what should be the angle of projection?

A) Yes, $60{}^\circ$

B) Yes, $30{}^\circ$

C) No

D) Yes, $45{}^\circ$

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• question_answer2) Spherical balls of radius R are falling in a viscous fluid of viscosity n with a velocity v. The retarding viscous force acting on the spherical ball is

A) directly proportional to R but inversely proportional to v

B) directly proportional to both radius R and velocity v

C) inversely proportional to both radius R and velocity v

D) inversely proportional to R but directly proportional to velocity v

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• question_answer3) Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show

A) paramagnetism

B) anti-ferromagnetism

C) no magnetic property

D) diamagnetism

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• question_answer4) In radioactive decay process, the negatively charged emitted $\text{-}$particles are

A) the electrons present inside the nucleus

B) the electrons produced as a result of the decay of neutrons inside the nucleus

C) the electrons produced as a result of collisions between atoms

D) the electrons orbiting around the nucleus

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• question_answer5) What is the value of inductance L for which the current is a maximum in a series LCR circuit with $C=10\,\mu F$ and $\omega =1000\,{{s}^{-1}}$?

A) 100 mH

B) 1 mH

C) Cannot be calculated unless R is known

D) 10 mH

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• question_answer6) Three point charges $+q,-2q$ and $+q$ are placed at points $(x=0,y=a,x=0),$$(x=0,y=0,z=0)$ and $(x=a,y=0,z=0),$ respectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are

A) $\sqrt{2}\,qa$ along $+y$ direction

B) $\sqrt{2}\,qa$along the line joining points $(x=0,y=0,z=0)$ and $(x=a,y=a,z=0)$

C) $qa$ along the line joining points $(x=0,y=0,z=0)$ and $(x=a,y=a,z=0)$

D) $\sqrt{2}\,qa$ along $+x$ direction

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• question_answer7) The maximum number of possible interference maxima for slit-separation equal to twice the wavelength in Youngs double-slit experiment, is

A) infinite

B) five

C) three

D) zero

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• question_answer8) Two spherical conductors B and C having equal radii and carrying equal charges in them repel each other with a force F when kept apart at some distance. A third spherical conductor having same radius as that of B but uncharged, is brought in contact with B, then brought in contact with C and finally removed away from both. The new force of repulsion between B and C is

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

B) $\frac{3F}{4}$

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

D) $\frac{3F}{8}$

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• question_answer9) In gamma ray emission from a nucleus

A) both the neutron number and the proton number change

B) there is no change in the proton number and the neutron number

C) only the neutron number changes

D) only the proton number changes

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• question_answer10) A particle starting from the origin$(0,0)$moves in a straight line in the$(x,y)$plane. Its coordinates at a later time are$(\sqrt{3},y).$The path of the particle makes with the $x$-axis an angle of

A) $30{}^\circ$

B) $45{}^\circ$

C) $60{}^\circ$

D) $0{}^\circ$

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• question_answer11) 11. A wheel has angular acceleration of $3.0\,rad\,/{{s}^{2}}$ and an initial angular speed of 2.00 rad/s. In a time of 2 s it has rotated through an angle (in radian) of

A) 6

B) 10

C) 12

D) 4

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• question_answer12) The resistance of an ammeter is $13\,\Omega$ and its scale is graduated for a current up to 100 A. After an additional shunt has been connected to this ammeter it becomes possible to measure currents up to 750 A by this meter. The value of shunt resistance is

A) $20\,\Omega$

B) $2\,\Omega$

C) $0.2\,\Omega$

D) $2k\,\Omega$

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• question_answer13) Under the influence of a uniform magnetic field a charged particle is moving in a circle of radius R with constant speed v. The time period of the motion

A) depends on v and not on R

B) depends on both R and v

C) is independent of both R and v

D) depends on R and not on v

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• question_answer14) The primary and secondary coils of a transformer have 50 and 1500 turns respectively. If the magnetic flux $\phi$ linked with the primary coil is given by$\phi ={{\phi }_{0}}$$+4t,$ where $\phi$ is in weber, t is time in second and ${{\phi }_{0}}$ is a constant, the output voltage across the secondary coil is

A) 90 V

B) 120 V

C) 220 V

D) 30 V

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• question_answer15) Two condensers, one of capacity C and the other of capacity$\frac{C}{2}$are connected to a V volt battery, as shown. The work done in charging fully both the condensers is

A) $2C{{V}^{2}}$

B) $\frac{1}{4}C{{V}^{2}}$

C) $\frac{3}{4}C{{V}^{2}}$

D) $\frac{1}{2}C{{V}^{2}}$

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• question_answer16) A uniform rod AS of length and mass m is free to rotate about point A. The rod is released from rest in the horizontal position. Given that the moment of inertia of the rod about A is $\frac{m{{l}^{2}}}{3},$ the initial angular acceleration of the rod will be A) $\frac{2g}{3l}$

B) $mg\frac{l}{2}$

C) $\frac{3}{2}gl$

D) $\frac{3g}{2l}$

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• question_answer17) The frequency of a light wave in a material is $2\times {{10}^{14}}Hz$ and wavelength is $5000\overset{\text{o}}{\mathop{\text{A}}}\,$. The refractive index of material will be

A) 1.40

B) 1.50

C) 3.00

D) 1.33

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• question_answer18) A car moves from $X$to $Y$ with a uniform speed ${{v}_{u}}$and returns to Y with a uniform speed${{v}_{d.}}$ The average speed for this round trip is

A) $\frac{2{{v}_{d}}{{v}_{u}}}{{{v}_{d}}{{v}_{u}}}$

B) $\sqrt{{{v}_{u}}{{v}_{d}}}$

C) $\frac{{{v}_{d}}{{v}_{u}}}{{{v}_{d}}+{{v}_{u}}}$

D) $\frac{{{v}_{u}}+{{v}_{d}}}{2}$

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• question_answer19) A particle executes simple harmonic oscillation with an amplitude a. The period of oscillation is T. The minimum time taken by the particle to travel half of the amplitude from the equilibrium position is

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

B) $\frac{T}{8}$

C) $\frac{T}{12}$

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

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• question_answer20) A block B is pushed momentarily along a horizontal surface with an initial velocity v. If $\mu$ is the coefficient of sliding friction between B and the surface, block B will come to rest after a time A) $\frac{v}{gu}$

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

C) $\frac{g}{v}$

D) $\frac{v}{g}$

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• question_answer21) Two radioactive substances A and B have decay constants $5\lambda$ and $\lambda$ respectively. At c = 0 they have the same number of nuclei. The ratio of number of nuclei of A to those of B will be ${{\left( \frac{1}{e} \right)}^{2}}$ after a time interval

A) $\frac{1}{4\lambda }$

B) $4\lambda$

C) $2\lambda$

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

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• question_answer22) A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 A, the efficiency of the transformer is approximately

A) 30%

B) 50%

C) 90%

D) 10%

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• question_answer23) A charged particle (charge q) is moving in a circle of radius R with uniform speed v. The associated magnetic moment u. is given by

A) $\frac{qvR}{2}$

B) $qv{{R}^{2}}$

C) $\frac{qv{{R}^{2}}}{2}$

D) $qvR$

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• question_answer24) A steady current of 1.5 A flows through a copper voltameter for 10 min. If the electrochemical equivalent of copper is $30\times {{10}^{-5}}\,g\,{{C}^{-1}},$ the mass of copper deposited on the electrode will be

A) 0.40 g

B) 0.50 g

C) 0.67 g

D) 0.27 g

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• question_answer25) In a mass spectrometer used for measuring the masses of ions, the ions are initially accelerated by an electric potential V and then made to describe semicircular paths of radius R using a magnetic field B. If V and B are kept constant, the ratio$\left( \frac{\text{charge}\,\text{on}\,\text{the}\,\text{ion}}{\text{mass}\,\text{of}\,\text{the}\,\text{ion}\,} \right)$will be proportional to

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

B) $\frac{1}{{{R}^{2}}}$

C) ${{R}^{2}}$

D) $R$

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• question_answer26) Three resistances P, Q, R each of $2\,\Omega$ and an unknown resistance S form the four arms of a Wheat stones bridge circuit. When a resistance of $6\,\Omega$ is connected in parallel to S the bridge gets balanced. What is the value of S?

A) $2\,\Omega$

B) $3\,\Omega$

C) $6\,\Omega$

D) $1\,\Omega$

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• question_answer27) Two satellites of earth, ${{S}_{1}}$ and ${{S}_{2,}}$ are moving in the same orbit. The mass of ${{S}_{1}}$ is four times the mass of ${{S}_{2}}$. Which one of the following statements is true?

A) The time period of ${{S}_{1}}$ is four times that of ${{S}_{2}}$

B) The potential energies of earth and satellite in the two cases are equal

C) ${{S}_{1}}$ and ${{S}_{2}}$ are moving with the same speed

D) The kinetic energies of the two satellites are equal

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• question_answer28) An observer moves towards a stationary source of sound, with a velocity one-fifth of the velocity of sound. What is the percentage increase in the apparent frequency?

A) Zero

B) 0.5%

C) 5%

D) 20%

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• question_answer29) A coil of inductance 300 mH and resistance$2\,\Omega$ is connected to a source of voltage 2 V. The current reaches half of its steady state value in

A) 0.05 s

B) 0.1 s

C) 0.15 s

D) 0.3 s

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• question_answer30) The refractive index of glass is 1.520 for red light and 1.525 for blue light. Let ${{D}_{1}}$ and ${{D}_{2}}$ be angles of minimum deviation for red and blue light respectively in a prism of this glass, then,

A) ${{D}_{1}}<{{D}_{2}}$

B) ${{D}_{1}}={{D}_{2}}$

C) ${{D}_{1}}$ can be less than or greater than${{D}_{2}}$ depending upon the angle of prism

D) ${{D}_{1}}>{{D}_{2}}$

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• question_answer31) A particle of mass 100 g is thrown vertically upwards with a speed of 5 m/s. The work done by the force of gravity during the time the particle goes up is

A) -0.5 J

B) -1.25 J

C) 1.25 J

D) 0.5 J

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• question_answer32) A mass of M kg is suspended by a weightless string. The horizontal force that is required to displace it until the string makes an angle of $45{}^\circ$ with the initial vertical direction is

A) $Mg(\sqrt{2}+1)$

B) $Mg\sqrt{2}$

C) $\frac{Mg}{\sqrt{2}}$

D) $Mg\sqrt{2}-1)$

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• question_answer33) A force of -F $\mathbf{\hat{k}}$ acts on 0, the origin of the coordinate system. The torque about the point (1,-1) is A) $F(\mathbf{\hat{i}-\hat{j}})$

B) $-F(\mathbf{\hat{i}}+\mathbf{\hat{j}})$

C) $F(\mathbf{\hat{i}}+\mathbf{\hat{j}})$

D) $-F(\mathbf{\hat{i}}-\mathbf{\hat{j}})$

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• question_answer34) If ${{M}_{O}}$ is the mass of an oxygen isotope $_{8}{{O}^{17}}$${{M}_{p}}$ and ${{M}_{n}}$ are the masses of a proton and a neutron, respectively, the nuclear binding energy of the isotope is

A) $({{M}_{0}}-8{{M}_{p}}){{c}^{2}}$

B) $({{M}_{0}}-8{{M}_{p}}-9{{M}_{n}}){{c}^{2}}$

C) ${{M}_{0}}{{c}^{2}}$

D) $({{M}_{0}}-17{{M}_{n}}){{c}^{2}}$

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• question_answer35) A sound absorber attenuates the sound level by 20 dB. The intensity decreases by a factor of

A) 1000

B) 10000

C) 10

D) 100

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• question_answer36) Which of the following parameters does not characterize the thermodynamic state of matter?

A) Temperature

B) Pressure

C) Work

D) Volume

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• question_answer37) A charged oil drop is suspended in uniform field of $3\times {{10}^{4}}\,V/m$ so that it neither falls nor rises. The charge on the drop will be (Take the mass of the charge $=9.9\,\times {{10}^{-15}}kg$ and $g=10\,m/{{s}^{2}}$)

A) $3.3\times {{10}^{-18}}C$

B) $3.2\times {{10}^{-18}}C$

C) $1.6\times {{10}^{-18}}C$

D) $4.8\times {{10}^{-18}}C$

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• question_answer38) A vertical spring with force constant k is fixed on a table. A ball of mass m at a height h above the free upper end of the spring falls vertically on the spring, so that the spring is compressed by a distance d. The net work done in the process is

A) $mg(h+d)\,+\frac{1}{2}k{{d}^{2}}$

B) $mg(h+d)\,-\frac{1}{2}k{{d}^{2}}$

C) $mg(h-d)\,-\frac{1}{2}k{{d}^{2}}$

D) $mg(h-d)\,+\frac{1}{2}k{{d}^{2}}$

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• question_answer39) Dimensions of resistance in an electrical circuit, in terms of dimension of mass M, of length L, of time T and of current $I,$ would be

A) $\text{ }\!\![\!\!\text{ M}{{\text{L}}^{\text{2}}}{{\text{T}}^{\text{-3}}}{{\text{I}}^{\text{-1}}}\text{ }\!\!]\!\!\text{ }$

B) $\text{ }\!\![\!\!\text{ M}{{\text{L}}^{\text{2}}}{{\text{T}}^{\text{-2}}}\text{ }\!\!]\!\!\text{ }$

C) $\text{ }\!\![\!\!\text{ M}{{\text{L}}^{\text{2}}}{{\text{T}}^{\text{-2}}}{{\text{I}}^{-1}}\text{ }\!\!]\!\!\text{ }$

D) $\text{ }\!\![\!\!\text{ M}{{\text{L}}^{\text{2}}}{{\text{T}}^{\text{-3}}}{{\text{I}}^{-1}}\text{ }\!\!]\!\!\text{ }$

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• question_answer40) An alpha nucleus of energy$\frac{1}{2}m{{v}^{2}}$ bombards a heavy nuclear target of charge $Ze$. Then the distance of closest approach for the alpha nucleus will be proportional to

A) ${{v}^{2}}$

B) $1/m$

C) $1/{{v}^{4}}$

D) $1/Ze$

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• question_answer41) The work of 146 kJ is performed in order to compress one kilo mole of a gas adiabatically and in this process the temperature of the gas increases by $7{}^\circ C$. The gas is $(R=8.3\,J\,mo{{l}^{-1}}\,{{K}^{-1}})$

A) diatomic

B) triatomic

C) a mixture of monoatomic and diatomic

D) monoatomic

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• question_answer42) If ${{g}_{E}}$ and ${{g}_{M}}$ are the accelerations due to gravity on the surfaces of the earth and the moon respectively and if Millikans oil drop experiment could be performed on the two surfaces, one will find the ratio$\frac{\text{electronic}\,\text{charge}\,\text{on}\,\text{the}\,\text{moon}}{\text{electronic}\,\text{charge}\,\text{on}\,\text{the}\,\text{earth}}$ to be

A) $1$

B) zero

C) $\frac{{{g}_{E}}}{{{g}_{M}}}$

D) $\frac{{{g}_{M}}}{{{g}_{E}}}$

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• question_answer43) Diwali rocket is ejecting 50 g of gases/s at a velocity of 400 m/s. The accelerating force on the rocket will be

A) 22 dyne

B) 20 N

C) 20 dyne

D) 100 N

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• question_answer44) A frame made of metallic wire enclosing a surface area A is covered with a soap film. If the area of the frame of metallic wire is reduced by 50%, the energy of the soap film will be changed by

A) 100%

B) 75%

C) 50%

D) 25%

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• question_answer45) Mercury boils at $367{}^\circ C$. However, mercury thermometers are made such that they can measure temperature up to $500{}^\circ C$. This is done by

A) maintaining vacuum above mercury column in the stem of the thermometer

B) filling nitrogen gas at high pressure above the mercury column

C) filling oxygen gas at high pressure above the mercury column

D) filling nitrogen gas at low pressure above the mercury column

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• question_answer46) In a laboratory four convex lenses${{L}_{1}},\,{{L}_{2}},{{L}_{3}}$ and ${{L}_{4}}$ of focal lengths 2, 4, 6 and 8 cm, respectively are available. Two of these lenses form a telescope of length 10 cm and magnifying power 4. The objective and eye lenses are respectively

A) $\,{{L}_{2}},{{L}_{3}}$

B) $\,{{L}_{1}},{{L}_{4}}$

C) $\,{{L}_{1}},{{L}_{2}}$

D) $\,{{L}_{4}},{{L}_{1}}$

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• question_answer47) A symmetric double convex lens is cut in two equal parts by a plane perpendicular to the principal axis. If the power of the original lens is 4D, the power of a cut lens will be

A) 2D

B) 3D

C) 4D

D) 5D

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• question_answer48) Two non-ideal batteries are connected in parallel. Consider the following statements. (i) The equivalent emf is smaller than either of the two emfs. (ii) The equivalent internal resistance is smaller than either of the two internal resistances.

A) Both (i) and (ii) are correct

B) (i) is correct but (ii) is wrong

C) (ii) is correct but (i) is wrong

D) Both (i) and (ii) are wrong

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• question_answer49) For a metallic wire, the ratio$\frac{V}{i}$ ( V = applied potential difference and $i=$current flowing) is

A) independent of temperature

B) increases as the temperature rises

C) decreases as the temperature rises

D) increases or decreases as temperature rises depending upon the metal

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• question_answer50) The potential energy of a molecule on the surface of a liquid compared to one inside the liquid is

A) zero

B) lesser

C) equal

D) greater

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• question_answer51) A particle of mass M and charge Q moving with velocity $\mathbf{\vec{V}}$describes a circular path of radius R when subjected to a uniform transverse magnetic field of induction B. The work done by the field when the particle completes one full circle is

A) $\left( \frac{M{{v}^{2}}}{R} \right)2\pi R$

B) zero

C) $BQ.\,2\pi R$

D) $BQv\,.\,\,2\pi R$

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• question_answer52) A thin rectangular magnet suspended freely has a period of oscillation equal to T. Now it is broken into two equal halves (each having half of the original length) and one piece is made to oscillate freely in the same field. If its period of oscillation is T, the ratio T/T is

A) $\frac{1}{2\sqrt{2}}$

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

C) 2

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

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• question_answer53) The magnetic lines of force inside a bar magnet

A) are from north-pole to south-pole of the magnet

B) do not exist

C) depend upon the area of cross-section of the bar magnet

D) are from south-pole to north-pole of the magnet

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• question_answer54) A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads 49 N, when the lift is stationary. If the lift moves downward with an acceleration of $5\,m/{{s}^{2}},$ the reading of the spring balance will be

A) 24 N

B) 74 N

C) 15 N

D) 49 N

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• question_answer55) The length of a wire of a potentiometer is 100 cm, and the emf of its stand and cell is E volt. It is employed to measure the emf of a battery whose internal resistance is$0.5\,\Omega$ If the balance point is obtained at $l=30$ cm from the positive end, the emf of the battery is

A) $\frac{30E}{100.5}$

B) $\frac{30E}{100-0.5}$

C) $\frac{30(E-0.5i)}{100},$where $i$is the current in the potentiometer wire

D) $\frac{30E}{100}$

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• question_answer56) Consider telecommunication through optical fibres. Which of the following statements is not true?

A) Optical fibres can be of graded refractive index

B) Optical fibres are subjected to electro- magnetic interference from outside

C) Optical fibres have extremely low transmission loss

D) Optical fibres may have homogeneous core with a suitable cladding

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• question_answer57) The thermo-emf of a thermocouple is $25\mu V{{/}^{\text{o}}}C$ at room temperature. A galvanometer of$40\,\Omega$ resistance, capable of detecting current as low as ${{10}^{-5}}A,$ is connected with the thermocouple. The smallest temperature difference that can be detected by this system is

A) $16{}^\circ C$

B) $12{}^\circ C$

C) $8{}^\circ C$

D) $20{}^\circ C$

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• question_answer58) The negative Zn pole of Daniell cell, sending a constant current through a circuit, decreases in mass by 0.13 gin 30 min. If the electrochemical equivalent of Zn and Cu are 32.5 and 31.5 respectively, the increase in the mass of the positive Cu pole in this time is

A) 0.180 g

B) 0.141 g

C) 0.126 g

D) 0.242 g

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• question_answer59) Dimensions of$\frac{1}{\mu {{ & }_{0}}{{\varepsilon }_{0}}},$where symbols have their usual meaning, are

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

B) $\text{ }\!\![\!\!\text{ }{{\text{L}}^{\text{2}}}{{\text{T}}^{2}}\text{ }\!\!]\!\!\text{ }$

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

D) $\text{ }\!\![\!\!\text{ L}{{\text{T}}^{-1}}\text{ }\!\!]\!\!\text{ }$

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• question_answer60) The time period of a satellite of earth is 5 h. If the separation between the earth and the satellite is increased to 4 times the previous value, the new time period will become

A) 10 h

B) 80 h

C) 40 h

D) 20 h

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• question_answer61) A particle performing uniform circular motion has angular momentum L. If its angular frequency is doubled and its kinetic energy is halved, then the new angular momentum is

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

B) $2L$

C) $4L$

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

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• question_answer62) Two spherical bodies of mass M and 5M and radii R and 2R respectively are released in free space with initial separation between their centres equal to 12.R. If they attract each other due to gravitational force only, then the distance covered by the smaller body just before collision is

A) 2.5R

B) 4.5R

C) 7.5R

D) 1.5R

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• question_answer63) The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the

A) crystal structure

B) variation of the number of charge carriers with temperature

C) type of bonding

D) variation of scattering mechanism with temperature

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• question_answer64) A car moving with a speed of 50 km/h, can be stopped by brakes after at least 6 m. If the same car is moving at a speed of 100 km/h, the minimum stopping distance is

A) 12 m

B) 18 m

C) 24 m

D) 6 m

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• question_answer65) A boy playing on the roof of a 10 m high building throws a ball with a speed of 10 m/s at an angle of $30{}^\circ$ with the horizontal. How far from the throwing point will the ball be at the height of 10 m from the ground? $(g=10\,m/{{s}^{2}},\,\sin {{30}^{o}}=1/2,\,\cos {{30}^{o}}=\sqrt{3}/2)$

A) 5.20m

B) 4.33m

C) 2.60m

D) 8.66m

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• question_answer66) An ammeter reads up to 1A. Its internal resistance is 0.81$\Omega$ To increase the range to 10 A the value of the required shunt is

A) $0.03\,\Omega$

B) $0.3\,\Omega$

C) $0.9\,\Omega$

D) $0.09\,\Omega$

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• question_answer67) The physical quantities not having same dimensions are

A) torque and work

B) momentum and Plancks constant

C) stress and Youngs modulus

D) speed and ${{({{\mu }_{0}}{{\varepsilon }_{0}})}^{-1/2}}$

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• question_answer68) Three forces start acting simultaneously on a particle moving with velocity$\mathbf{\vec{v}}.$These forces are represented in magnitude and direction by the three sides of a triangle ABC (as shown). The particle will now move with velocity A) less than$\mathbf{\vec{v}}$

B) greater than$\mathbf{\vec{v}}$

C) $v$ in the direction of largest force BC

D) $\mathbf{\vec{v}}$remaining unchanged

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• question_answer69) If the electric flux entering and leaving an enclosed surface respectively is${{\phi }_{1}}$ and${{\phi }_{2}}$ the electric charge inside the surface will be

A) $({{\phi }_{2}}-{{\phi }_{1}}){{\varepsilon }_{0}}$

B) $({{\phi }_{1}}+{{\phi }_{2}})/{{\varepsilon }_{0}}$

C) $({{\phi }_{2}}-{{\phi }_{1}})/{{\varepsilon }_{0}}$

D) $({{\phi }_{1}}+{{\phi }_{2}}){{\varepsilon }_{0}}$

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• question_answer70) A marble block of mass 2 kg lying on ice when given a velocity of 6 m/s is stopped by friction in 10 s. Then the coefficient of friction is

A) 0.02

B) 0.03

C) 0.06

D) 0.01

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• question_answer71) Two coils are placed close to each other. The mutual inductance of the pair of coils depends upon

A) the rates at which currents are changing in the two coils

B) relative position and orientation of the two coils

C) the materials of the wires of the coils

D) the currents in the two coils

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• question_answer72) A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. If a force P is applied at the free end of the rope, the force exerted by the rope on the block is

A) $\frac{Pm}{M+m}$

B) $\frac{Pm}{M-m}$

C) $P$

D) $\frac{PM}{M+m}$

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• question_answer73) A light spring balance hangs from the hook of the other light spring balance and a block of mass M kg hangs from the former one. Then the true statement about the scale reading is

A) both the scales read M kg each

B) the scale of the lower one reads M kg and of the upper one zero

C) the reading of the two scales can be anything but the sum of the readings will be M kg

D) both the scales read M / 2 kg

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• question_answer74) A wire suspended vertically from one of its ends is stretched by attaching a weight of 200 N to the lower end. The weight stretches the wire by 1 mm. Then the elastic energy stored in the wire is

A) 0.2 J

B) 10 J

C) 20 J

D) 0.1 J

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• question_answer75) A mass M is suspended from a spring of negligible mass. The spring is pulled a little and then released so that the mass executes SHM of time period T. If the mass is increased by m, the time period becomes $\text{5T/3,}$then the ratio of$\frac{m}{M}$is

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

B) $\frac{25}{9}$

C) $\frac{16}{9}$

D) $\frac{5}{3}$

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• question_answer76) Heat cannot be itself flow from a body at lower temperature to a body at higher temperature is a statement or consequence of

A) second law of thermodynamics

B) conservation of momentum

C) conservation of mass

D) first law of thermodynamics

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• question_answer77) The length of a simple pendulum executing simple harmonic motion is increased by 21%. The percentage increase in the time period of the pendulum of increased length is

A) 11%

B) 21%

C) 42%

D) 10.5%

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• question_answer78) The displacement y of wave travelling in the x-direction is given by $y={{10}^{-4}}\sin \left( 600t-2x+\frac{\pi }{3} \right)metre,$ where, x is expressed in metres and t in seconds. The speed of the wave motion, in Ms-1 is

A) 300

B) 600

C) 1200

D) 200

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• question_answer79) When the current changes from +2A to - 2A in 0.05 s, an emf of 8V is induced in a coil. The coefficient of self-induction of the coil is

A) 0.2 H

B) 0.4 H

C) 0.8 H

D) 0.1 H

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• question_answer80) In an oscillating LC circuit the maximum charge on the capacitor is$Q.$The charge on the capacitor when the energy is stored equally between the electric and magnetic fields is

A) $Q/2$

B) $Q/\sqrt{3}$

C) $Q/\sqrt{2}$

D) $Q$

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• question_answer81) A radioactive sample at any instant has its disintegration rate 5000 disintegrations per minute. After 5 min, the rate is 1250 disintegrations per min. Then, the decay constant (per minute) is

A) 0.4 In 2

B) 0.2 In 2

C) 0.1 In 2

D) 0.8 In 2

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• question_answer82) A nucleus with Z=92 emits the following in a sequence: $\alpha ,\,\alpha ,\,{{\beta }^{-}},\,{{\beta }^{-}},\,\alpha ,\,\alpha ,\,\alpha ,\,\alpha ,\,{{\beta }^{-}},\,{{\beta }^{-}},\,\alpha ,\,{{\beta }^{+}},\,{{\beta }^{+}},\,\alpha$. The Z of the resulting nucleus is

A) 76

B) 78

C) 82

D) 74

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• question_answer83) Which of the following cannot be emitted by radioactive substances during their decay?

A) Protons

B) Neutrinos

C) Helium nuclei

D) Electrons

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• question_answer84) A. sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

A) decreases

B) remains unchanged

C) becomes infinite

D) increases

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• question_answer85) The displacement of a particle varies according to the relation$x=4(\cos \,\pi t+\sin \,\pi t).$ The amplitude of the particle is

A) -4

B) 4

C) $4\sqrt{2}$

D) 8

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• question_answer86) The work done in placing a charge of $8\times {{10}^{-18}}C$ on a condenser of capacity 100 micro-farad is

A) $16\times {{10}^{-32}}\text{J}$

B) $3.1\times {{10}^{-26}}\text{J}$

C) $4\times {{10}^{-10}}\text{J}$

D) $32\times {{10}^{-32}}\text{J}$

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• question_answer87) The coordinates of a moving particle at any time t are given by $x=\alpha {{t}^{3}}$ and$y={{t}^{3}}.$ The speed of the particle at time t is given by

A) $3t\sqrt{{{\alpha }^{2}}+{{\beta }^{2}}}$

B) $3{{t}^{2}}\sqrt{{{\alpha }^{2}}+{{\beta }^{2}}}$

C) ${{t}^{2}}\sqrt{{{\alpha }^{2}}+{{\beta }^{2}}}$

D) $\sqrt{{{\alpha }^{2}}+{{\beta }^{2}}}$

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• question_answer88) During the adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio ${{\text{C}}_{\text{p}}}\text{/}{{\text{C}}_{\text{v}}}$ for the gas is

A) 4/3

B) 2

C) 5/3

D) 3/2

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• question_answer89) Which of the following parameters does not characterize the thermodynamic state of matter?

A) Temperature

B) Pressure

C) Work

D) Volume

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• question_answer90) A spring of spring constant $5\times {{10}^{3}}\,N/m$ is stretched initially by 5 cm from the unstretched position. Then the work required to stretch it further by another 5 cm is

A) 12.50 N-m

B) 18.75 N-m

C) 25.00 N-m

D) 6.25 N-m

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• question_answer91) A metal wire of linear mass density of 9.8 g/m is stretched with a tension of 10 kg-wt between two rigid supports 1 m apart. The wire passes at its middle point between the poles of a permanent magnet and it vibrates in resonance when carrying an alternating current of frequency n. The frequency n of the alternating source is

A) 50 Hz

B) 100 Hz

C) 200 Hz

D) 25 Hz

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• question_answer92) A body executes simple harmonic motion. The potential energy (PE), the kinetic energy (KE) and total energy (TE) are measured as function of displacement x. Which of the following statements is true?

A) KE is maximum when x = 0

B) TE is zero when x = 0

C) KE is maximum when x is maximum

D) PE is maximum when x = 0

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• question_answer93) In the middle of the depletion layer of reverse biased p- n junction, the

A) electric field is zero

B) potential is maximum

C) electric field is maximum

D) potential is zero

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• question_answer94) If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron from the first excited state of $L{{i}^{2+}}$ is

A) 30.6 eV

B) 13.6 eV

C) 3.4 eV

D) 122.4 eV

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• question_answer95) A rocket with a lift-off mass $3.5\,\times {{10}^{4}}\,kg$ is blasted upwards with an initial acceleration of $10\,m/{{s}^{2}}$. Then the initial thrust of the blast is

A) $3.5\times {{10}^{5}}\,N$

B) $7.0\,\times {{10}^{5}}\,N$

C) $14.0\,\times {{10}^{5}}\,N$

D) $1.75\,\times {{10}^{5}}\,N$

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• question_answer96) To demonstrate the phenomenon of interference we require two sources which emit radiations of

A) nearly the same frequency

B) the same frequency

C) different wavelength

D) the same frequency and having a definite phase relationship

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• question_answer97) The earth radiates in the infra-red region of the spectrum. The spectrum is correctly given by

A) Rayleigh Jeans law

B) Plancks law of radiation

C) Stefans law of radiation

D) Wiens law

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• question_answer98) To get three images of a single object, one should have two plane mirrors at an angle of

A) $60{}^\circ$

B) $90{}^\circ$

C) $120{}^\circ$

D) $30{}^\circ$

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• question_answer99) According to Newtons law of cooling, the rate of cooling of a body is proportional to${{(\Delta )}^{n}},$ where$\Delta$ is the difference of the temperature of the body and the surroundings, and n is equal to

A) two

B) three

C) four

D) one

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• question_answer100) The length of a given cylindrical wire is increased by 100%. Due to the consequent decrease in diameter the change in the resistance of the wire will be

A) 200%

B) 100%

C) 50%

D) 300%

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• question_answer101) Which of the following is not correct?

A) Hydrolysis of $NC{{l}_{3}}$ gives $N{{H}_{3}}$ and $HOCl$

B) $N{{H}_{3}}$ is less stable than$P{{H}_{3}}$

C) $N{{H}_{3}}$ is a weak reducing reagent compared to$P{{H}_{3}}$

D) Nitric oxide in solid state exhibits diamagnetic property

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• question_answer102) $Si{{O}_{2}}$is reacted with sodium carbonate. What is the gas liberated?

A) $CO$

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

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

D) ${{O}_{3}}$

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• question_answer103) The compounds formed at anode in the electrolysis of an aqueous solution of potassium acetate, are

A) ${{C}_{2}}{{H}_{6}}$and$C{{O}_{2}}$

B) ${{C}_{2}}{{H}_{4}}$and$C{{O}_{2}}$

C) $C{{H}_{4}}$and${{H}_{2}}$

D) $C{{H}_{4}}$and$C{{O}_{2}}$

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• question_answer104) Which of the following is not correct regarding the elecolytic preparation of${{H}_{2}}{{O}_{2}}$?

A) Lead is used as cathode

B) $50%\,\,{{H}_{2}}S{{O}_{4}}$ is used

C) Hydrogen is liberated at anode

D) Sulphuric acid undergoes oxidation

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• question_answer105) Which of the following is correct?

A) The $pH$ of one litre solution containing$0.49\,\,g$of${{H}_{2}}S{{O}_{4}}$is$2.0$

B) The conjugate base of${{H}_{2}}S$is${{S}^{2-}}$

C) $B{{F}_{3}}$ is a Lewis base

D) Phenolphthalein is colourless in basic medium

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• question_answer106) Which of the following is correct?

A) Catalyst undergoes permanent chemical change

B) Particle size of solute in true solution is${{10}^{-3}}m$

C) Starch solution is a hydrosol

D) Hydrolysis of liquid ester in the presence of mineral acid is an example of heterogeneous catalysis reactions

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• question_answer107) In an oxidation-reduction reaction, $MnO_{4}^{-}$ ion is converted to$M{{n}^{2+}}$. What is the number of equivalents of$KMn{{O}_{4}}$ (mol. wt. =158) present in $250\,\,mL$ of $0.04\,\,M\,\,KMn{{O}_{4}}$ solution?

A) $0.02$

B) $0.05$

C) $0.04$

D) $0.07$

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• question_answer108) Which of the following reagents converts both acetaldehyde and acetone to alkanes?

A) $Ni/{{H}_{2}}$

B) $LiAl{{H}_{4}}$

C) ${{I}_{2}}/NaOH$

D) $Zn\text{-}Hg/conc.HCl$

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• question_answer109) The heat of formation of $CO(g)$ and $C{{O}_{2}}(g)$ are $\Delta H=-110$ and $\Delta H=-393\,\,kJ\,\,mo{{l}^{-1}}$ respectively. What is the heat of reaction$(\Delta H)$ (in$kJ\,\,mo{{l}^{-1}})$ for the following reaction? $CO(g)+\frac{1}{2}{{O}_{2}}(g)\xrightarrow{{}}C{{O}_{2}}(g)$

A) $-504$

B) $-142.5$

C) $-283$

D) $504$

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• question_answer110) What is the wavelength (in$m$) of a particle of mass $6.62\times {{10}^{-29}}g$ moving with a velocity of${{10}^{3}}\,\,m{{s}^{-1}}$?

A) $6.62\times {{10}^{-4}}$

B) $6.62\times {{10}^{-3}}$

C) ${{10}^{-5}}$

D) ${{10}^{5}}$

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• question_answer111) What is the electrode potential (in$V$) of the following electrode at${{25}^{o}}C$? $N{{i}^{2+}}(0.1\,\,M)|Ni(s)$ (Standard reaction potential of $N{{i}^{2+}}|Ni$ is $-0.25\,\,V,\,\,\frac{2.303RT}{F}=0.06)$

A) $-0.28\,\,V$

B) $-0.34\,\,V$

C) $-0.82\,\,V$

D) $-0.22\,\,V$

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• question_answer112) What is the equation for the equilibrium constant $({{K}_{c}})$ for the following reaction? $\frac{1}{2}A(g)+\frac{1}{3}B(g)\frac{2}{3}C(g)$

A) ${{K}_{c}}=\frac{{{[A]}^{1/2}}{{[B]}^{1/3}}}{{{[C]}^{3/2}}}$

B) ${{K}_{c}}=\frac{{{[C]}^{3/2}}}{{{[A]}^{2}}{{[B]}^{3}}}$

C) ${{K}_{c}}=\frac{{{[C]}^{2/3}}}{{{[A]}^{1/2}}{{[B]}^{1/3}}}$

D) ${{K}_{c}}=\frac{{{[C]}^{2/3}}}{{{[A]}^{1/2}}+{{[B]}^{1/3}}}$

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• question_answer113) Which of the following can give a Grignard reagent when reacted with magnesium in dry ether?

A) ${{C}_{2}}{{H}_{6}}$

B) ${{C}_{2}}{{H}_{5}}Cl$

C) ${{C}_{2}}{{H}_{5}}OH$

D) ${{C}_{2}}{{H}_{5}}CN$

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• question_answer114) Which of the following is not correct?

A) $Al$ reacts with $NaOH$ and liberate${{H}_{2}}$

B) $AlC{{l}_{3}}$ is a Lewis acid

C) $Al$ is used in the manufacture of electrical cables

D) $NaOH$ is used during Halls process of purification of bauxite

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• question_answer115) $A\,\,0.5\,\,g/L$ solution of glucose is found to be isotonic with a $2.5\,\,g/L$ solution of an organic compound. What will be the molecular weight of that organic compound?

A) $300$

B) $600$

C) $900$

D) $200$

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• question_answer116) $t-$butyl chloride preferably undergo hydrolysis by

A) ${{S}_{N}}1$ mechanism

B) ${{S}_{N}}2$mechanism

C) Any of (a) and (b)

D) None of the above

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• question_answer117) Adipic acid on heating form

A) B) C) D) View Answer play_arrow
• question_answer118) To dissolve argentite ore which of the following is used?

A) $Na[Ag{{(CN)}_{2}}]$

B) $NaCN$

C) $NaCl$

D) $HCl$

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• question_answer119) If $50%$ of a radioactive substance dissociates in$15\,\,\min$, then the time taken by substance to dissociate $99%$ will be

A) $50\min$

B) $100\min$

C) $99\min$

D) $150\min$

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• question_answer120) $H-O-H$ bond angle in ${{H}_{2}}O$ is ${{104.5}^{o}}$ and not ${{109.28}^{o}}$ because of

A) lone pair-lone pair repulsion

B) lone pair-bond pair repulsion

C) bond pair-bond pair repulsion

D) high electronegativity of oxygen

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• question_answer121) The reaction, ${{C}_{6}}{{H}_{5}}CHO+C{{H}_{3}}COO{{C}_{2}}{{H}_{5}}\xrightarrow{{}}$ ${{C}_{6}}{{H}_{5}}CH=CHCOO{{C}_{2}}{{H}_{5}}$, is called

A) Benzoin condensation

B) Claisen condensation

C) Cannizaros reaction

D) Perkin reaction

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• question_answer122) The best method to separate the mixture of ortho and para nitrophenol $(1:1)$ is

A) vaporization

B) colour spectrum

C) distillation

D) crystallization

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• question_answer123) Iodoform gives a precipitate with $AgN{{O}_{3}}$ on heating but chloroform does not because

A) $C-I$ bond in iodoform is weak and $C-Cl$ bond in chloroform is strong

B) chloroform is covalent

C) iodoform is ionic

D) None of the above

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• question_answer124) What are the values of ${{n}_{1}}$ and ${{n}_{2}}$ respectively for ${{H}_{\beta }}$ line in the Lyman series of hydrogen atomic spectrum?

A) 3 and 5

B) 2 and 3

C) 1 and 3

D) 2 and 4

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• question_answer125) The homologue of ethyne is

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

B) ${{C}_{2}}{{H}_{6}}$

C) ${{C}_{3}}{{H}_{8}}$

D) ${{C}_{3}}{{H}_{4}}$

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• question_answer126) $A\,\,0.1$ aqueous solution of a weak acid is$2%$ ionized. If the ionic product of water is $1\times {{10}^{-4}},$ the $[O{{H}^{-}}]$ is

A) $5\times {{10}^{-12}}M$

B) $2\times {{10}^{-3}}M$

C) $1\times {{10}^{-4}}M$

D) None of these

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• question_answer127) Which of the following does not have coordinate bond?

A) $S{{O}_{2}}$

B) $HN{{O}_{3}}$

C) ${{H}_{2}}S{{O}_{3}}$

D) $HN{{O}_{2}}$

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• question_answer128) The total number of orbitals in the fifth energy level is

A) 5

B) 10

C) 18

D) 25

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• question_answer129) The most probable velocity (in$cm/s)$ of hydrogen molecule at ${{27}^{o}}C$ will be

A) $19.3\times {{10}^{4}}$

B) $17.8\times {{10}^{4}}$

C) $24.93\times {{10}^{9}}$

D) $17.8\times {{10}^{8}}$

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• question_answer130) Element with atomic number 38, belongs to

A) $IIA$group and 5th period

B) $II\,\,A$ group and 2nd period

C) $V\,\,A$group and 2nd period

D) $III\,\,A$ group and 5th period

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• question_answer131) In an oxidation reduction reaction, dichromate $(C{{r}_{2}}O_{7}^{2-})$ ion is reduced to $C{{r}^{3+}}$ ion. The equivalent weight of ${{K}_{2}}C{{r}_{2}}{{O}_{7}}$ in this reaction is molecular weight

A) $\frac{molecular\,\,weight}{3}$

B) $\frac{molecular\,\,weight}{6}$

C) $\frac{molecular\,\,weight}{1}$

D) $\frac{molecular\,\,weight}{2}$

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• question_answer132) What is the wave number of 4th line in Balmer series of hydrogen spectrum? $(R=1,09,677\text{ }c{{m}^{-1}})$

A) $24,630\,\,c{{m}^{-1}}$

B) $23,360\,\,c{{m}^{-1}}$

C) $24,730\,\,c{{m}^{-1}}$

D) $24,372\,\,c{{m}^{-1}}$

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• question_answer133) $9.2\,\,g\,\,{{N}_{2}}{{O}_{4}}$is heated in a $1\,\,L$ vessel till equilibrium state is established ${{N}_{2}}{{O}_{4}}(g)2N{{O}_{2}}(g)$ In equilibrium state 50% N^4 was dissociated, equilibrium constant will be $(\text{mol}.\text{wt}\text{.}\,\,\text{of}\,\,{{N}_{2}}{{O}_{4}}=92)$

A) $0.1$

B) $0.4$

C) $0.3$

D) $0.2$

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• question_answer134) Disperse phase and dispersion medium in butter are respectively

A) solid and liquid

B) liquid and solid

C) liquid and liquid

D) solid and solid

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• question_answer135) Which of the following carbonates decomposes readily at low temperatures?

A) $N{{a}_{2}}C{{O}_{3}}$

B) ${{K}_{2}}C{{O}_{3}}$

C) $L{{i}_{2}}C{{O}_{3}}$

D) $R{{b}_{2}}C{{O}_{3}}$

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• question_answer136) The atomic number of an element $M$ is 26. How many electrons are present in the $M-$shell of the element in its ${{M}^{3+}}$ state?

A) $11$

B) $15$

C) $14$

D) $13$

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• question_answer137) In which of the following pairs, both molecules possess dipole moment?

A) $C{{O}_{2}},\,\,S{{O}_{2}}$

B) $BC{{l}_{3}},\,\,PC{{l}_{3}}$

C) ${{H}_{2}}O,\,\,S{{O}_{2}}$

D) $C{{O}_{2}},\,\,C{{S}_{2}}$

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• question_answer138) Match the following

 Set-I Set-II (A) $10\,\,vol\,\,{{H}_{2}}{{O}_{2}}$ 1. perhydrol (B) $20\,\,vol\,\,{{H}_{2}}{{O}_{2}}$ 2. $5.358\,\,N$ (C) $30\,\,vol\,\,{{H}_{2}}{{O}_{2}}$ 3. $1.785\,\,M$ (D) $100\,\,vol\,\,{{H}_{2}}{{O}_{2}}$ 4. $3.03%$
The correct match is

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

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

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

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

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• question_answer139) During, acetylation of amines, what is replaced by acetyl group?

A) Hydrogen atom attached to nitrogen atom

B) One or more hydrogen atoms attached to carbon atom

C) One or more hydrogen atoms attached to nitrogen atom

D) Hydrogen atoms attached to either carbon atom or nitrogen atom

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• question_answer140) Which is used in alcoholic beverages?

A) Methanol

B) Ethanol

C) Phenol

D) Glycerol

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• question_answer141) Oxidation state of oxygen in ${{F}_{2}}O$ is

A) $+1$

B) $-1$

C) $+2$

D) $-2$

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• question_answer142) In $III$ group precipitation, $N{{H}_{4}}Cl$ is added before adding $N{{H}_{4}}OH$ to

A) decrease conc. of$O{{H}^{-}}$

B) prevent interference of$PO_{4}^{3-}$

C) increase conc. of$C{{l}^{-}}$

D) increase conc. of$O{{H}^{-}}$ion

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• question_answer143) Steel is heated to below red heat and then, cooled slowly. The process refers to

A) hardening

B) annealing

C) tempering

D) nitriding

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• question_answer144) Which one of the following reactions is called Rosenmund reaction?

A) Aldehydes are reduced to alcohols

B) Acids are converted to acid chlorides

C) Alcohols are reduced to hydrocarbons

D) Acid chlorides are reduced to aldehydes

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• question_answer145) $IUPAC$ name of C{{H}_{3}}-C{{H}_{2}}-\underset{\begin{align} & | \\ & C{{H}_{2}} \\ & | \\ & C{{H}_{3}} \\ \end{align}}{\mathop{C}}\,H-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,=C{{H}_{2}} is

A) 2-methyl-3-ethyl-1-pentene

B) 3-ethyl-4-methyl-4-pentene

C) 3-ethyl-2-methyl-1-pentene

D) 3-methyl-2-ethyl-1-pentene

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• question_answer146) Which of the following dissolves in water but does not give any oxyacid solution?

A) $S{{O}_{2}}$

B) $O{{F}_{2}}$

C) $SC{{l}_{4}}$

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

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• question_answer147) The formula of Calgon, used for water softening is

A) $N{{a}_{2}}[N{{a}_{4}}{{(P{{O}_{3}})}_{6}}]$

B) $N{{a}_{4}}[N{{a}_{2}}{{(P{{O}_{3}})}_{6}}]$

C) $N{{a}_{2}}[N{{a}_{4}}{{(P{{O}_{4}})}_{5}}]$

D) $N{{a}_{4}}[N{{a}_{4}}{{(P{{O}_{4}})}_{6}}]$

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• question_answer148) A mixture of amylose and amylopectin is called

A) lactose

B) starch

C) cellulose

D) sucrose

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• question_answer149) Methyl alcohol when reacted with carbon monoxide using cobalt or rhodium as catalyst, compound $A$ is formed. On heating $A$ with $HI$ in the presence of red phosphorus as catalyst $B$ is formed. Identify$B$.

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

B) $C{{H}_{3}}\cdot CHO$

C) $C{{H}_{3}}\cdot C{{H}_{2}}\cdot I$

D) $C{{H}_{3}}\cdot C{{H}_{3}}$

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• question_answer150) One gas bleaches the colour of flowers by reduction and another gas by oxidation. The gases respectively are

A) $S{{O}_{2}}$and$C{{l}_{2}}$

B) $CO$and$C{{l}_{2}}$

C) $N{{H}_{3}}$and$S{{O}_{2}}$

D) ${{H}_{2}}S$and$B{{r}_{2}}$

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• question_answer151) The de-Broglie wavelength of a tennis ball of mass $60\,\,g$ moving with a velocity of $10\,\,m/s$ is approximately (Plancks constant, $h=6.63\times {{10}^{-34}}\,\,Js)$

A) ${{10}^{-33}}m$

B) ${{10}^{-31}}m$

C) ${{10}^{-16}}m$

D) ${{10}^{-25}}m$

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• question_answer152) How many unit cells are present in a cube shaped ideal crystal of $NaCl$ of mass$1.00\,\,g$? [Atomic masses:$Na=23,\,\,Cl=35.5]$

A) $2.57\times {{10}^{21}}$

B) $5.14\times {{10}^{21}}$

C) $1.28\times {{10}^{21}}$

D) $1.71\times {{10}^{21}}$

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• question_answer153) Glass is a

A) micro-crystalline solid

B) super-cooled liquid

C) gel

D) polymeric mixture

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• question_answer154) Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite

A) is a non-crystalline substance

B) is an allotropic form of diamond

C) has molecules of variable molecular masses like polymers

D) has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds

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• question_answer155) The $IUPAC$ name of$C{{H}_{3}}COCH{{(C{{H}_{3}})}_{2}}$is

A) isopropylmethyl ketone

B) 2-methyl-3-butanone

C) 4-methylisopropyl ketone

D) 3-methyl-2-butanone

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• question_answer156) When $C{{H}_{2}}=CH-COOH$ is reduced with $LiAl{{H}_{4}}$, the compound obtained will be

A) $C{{H}_{3}}-C{{H}_{2}}-COOH$

B) $C{{H}_{2}}=CH-C{{H}_{2}}OH$

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

D) $C{{H}_{3}}-C{{H}_{2}}-CHO$

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• question_answer157) Which of the following group of transition metals is railed coinage metals?

A) $Cu,\,\,Ag,\,\,Au$

B) $Ru,\,\,Rh,\,\,Pd$

C) $Fe,\,\,Co,\,\,Ni$

D) $Os,\,\,Ir,\,\,Pt$

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• question_answer158) An ether is more volatile than an alcohol having the same molecular formula. This is due to

A) dipolar character of ethers

B) alcohols having resonance structures

C) inter-molecular hydrogen bonding in ethers

D) inter-molecular hydrogen bonding in alcohols

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• question_answer159) Among the following four structures $I$ to$IV$: $\underset{(I)}{\mathop{{{C}_{2}}{{H}_{5}}-\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}\,H-{{C}_{3}}{{H}_{7}}}}\,$$\underset{(II)}{\mathop{C{{H}_{3}}-\overset{\begin{smallmatrix} O \\ |\,\,| \end{smallmatrix}}{\mathop{C}}\,-\overset{\begin{smallmatrix} C{{H}_{3}} \\ |\,\,| \end{smallmatrix}}{\mathop{C}}\,H-{{C}_{2}}{{H}_{5}}}}\,$ $\underset{\,\,\,\,\,\,\,\,\,\,\,\,(III)}{\mathop{H-{{\underset{\begin{smallmatrix} | \\ H \end{smallmatrix}}{\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{C}}}\,}^{\oplus }}}}\,$ $\underset{(IV)}{\mathop{{{C}_{2}}{{H}_{5}}-\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}\,H-{{C}_{2}}{{H}_{5}}}}\,$ it is true that

A) all four are chiral compounds

B) only I and II are chiral compounds

C) only III is a chiral compound

D) only II and IV are chiral compounds

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• question_answer160) Which one of the following processes will produce hard water?

A) Saturation of water with$CaC{{O}_{3}}$

B) Saturation of water with$MgC{{O}_{3}}$

C) Saturation of water with$CaS{{O}_{4}}$

D) Addition of$N{{a}_{2}}S{{O}_{4}}$to water

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• question_answer161) The pair of species having identical shapes for molecules of both species is

A) $C{{F}_{4}},\,\,S{{F}_{4}}$

B) $Xe{{F}_{2}},\,\,C{{O}_{2}}$

C) $B{{F}_{3}},\,\,PC{{l}_{3}}$

D) $P{{F}_{5}},\,\,I{{F}_{5}}$

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• question_answer162) The atomic numbers of vanadium$(V)$, chromium$(Cr)$, manganese $(Mn)$ and iron $(Fe)$ are respectively $23,\,\,24,\,\,25$ and$26$. Which one of these may be expected to have the highest second ionisation enthalpy?

A) $V$

B) $Cr$

C) $Mn$

D) $Fe$

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• question_answer163) Consider the reaction equilibrium: $2S{{O}_{2}}(g)+{{O}_{2}}(g)2S{{O}_{3}}(g);$ $\Delta {{H}^{o}}=-198\,kJ$ On the basis of Le-Chateliers principle, the condition favourable for the forward reaction is

A) lowering of temperature as well as pressure

B) increasing temperature as well as pressure

C) lowering the temperature and increasing the pressure

D) any value of temperature and pressure

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• question_answer164) For the reaction equilibrium, ${{N}_{2}}{{O}_{4}}(g)2NO(g)$ the concentrations of ${{N}_{2}}{{O}_{4}}$ and $N{{O}_{2}}$ at equilibrium are $4.8\times {{10}^{-2}}$ and $1.2\times {{10}^{-2}}mol\,\,{{L}^{-1}}$respectively. The value of ${{K}_{c}}$ for the reaction is

A) $3.3\times {{10}^{2}}mol\,\,{{L}^{-1}}$

B) $3\times {{10}^{-1}}mol\,\,{{L}^{-1}}$

C) $3\times {{10}^{-3}}mol\,\,{{L}^{-1}}$

D) $3\times {{10}^{3}}mol\,\,{{L}^{-1}}$

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• question_answer165) The solubility in water of a sparingly soluble salt $A{{B}_{2}}$ is$1.0\times {{10}^{-5}}mol\,\,{{L}^{-1}}$. Its solubility product number will be

A) $4\times {{10}^{-15}}$

B) $4\times {{10}^{-10}}$

C) $1\times {{10}^{-15}}$

D) $1\times {{10}^{-10}}$

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• question_answer166) When during electrolysis of a solution of $AgN{{O}_{3}},\,\,9650$coulombs of charge pass through the electroplating bath, the mass of silver deposited on the cathode will be

A) $1.08\,\,g$

B) $10.8\,\,g$

C) $21.6\,\,g$

D) $108\,\,g$

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• question_answer167) For the redox reaction $Zn(s)+C{{u}^{2+}}(0.1\,\,M)\to Z{{n}^{2+}}(1M)+Cu(s)$taking place in a cell, $E_{cell}^{\text{o}}$is$1.10\,\,volt$. ${{E}_{cell}}$for the cell will be:$\left( 2.303\frac{RT}{F}=0.0591 \right)$

A) $2.14\,\,V$

B) $1.80\,\,V$

C) $1.07\,\,V$

D) $0.82\,\,V$

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• question_answer168) In a $0.2$ molal aqueous solution of a weak acid$H\,\,X$, the degree of ionization is$0.3$. Taking ${{k}_{f}}$ for water as$1.85$, the freezing point of the solution will be nearest to

A) $-{{0.480}^{o}}C$

B) $-{{0.360}^{o}}C$

C) $-{{0.260}^{o}}C$

D) $+{{0.480}^{o}}C$

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• question_answer169) $25\,\,mL$ of a solution of barium hydroxide on titration with $0.1$ molar solution of hydrochloric acid gave a titre value of $35\,\,mL$. The molarity of barium hydroxide solution was

A) $0.07$

B) $0.14$

C) $0.28$

D) $0.35$

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• question_answer170) The correct relationship between free energy change in a reaction and the corresponding equilibrium constant ${{K}_{c}}$ is

A) $\Delta G=RT\ln {{K}_{c}}$

B) $-\Delta G=RT\ln {{K}_{c}}$

C) $\Delta {{G}^{o}}=RT\ln {{K}_{c}}$

D) $-\Delta {{G}^{o}}=RT\ln {{K}_{c}}$

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• question_answer171) If at $298\,\,K$ the bond energies of $C-H,\,\,C-C,$$C=C$ and $H-H$ bonds are respectively $414,\,\,347,\,\,615$ and $435\,\,kJ\,\,mo{{l}^{-1}}$, the value of enthalpy change for the reaction ${{H}_{2}}C=C{{H}_{2}}(g)+{{H}_{2}}(g)\xrightarrow{{}}{{H}_{2}}C-C{{H}_{2}}(g)$ at $298\,\,K$ will be

A) $+250\,\,kJ$

B) $-250\,\,kJ$

C) $+125\,\,kJ$

D) $-125\,\,kJ$

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• question_answer172) A pressure cooker reduces cooking time for food because

A) heat is more evenly distributed in the cooking space

B) boiling point of water involved in cooking is increased

C) the higher pressure inside the cooker crushes the food material

D) cooking involves chemical changes helped by a rise in temperature

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• question_answer173) In an irreversible process taking place at constant $T$ and $P$ and in which only pressure-volume work is being done, the change in Gibbs free energy $(dG)$ and change in entropy$(dS)$, satisfy the criteria

A) ${{(dS)}_{V,\,\,E}}<0,\,\,{{(dG)}_{T,\,\,P}}<0$

B) ${{(dS)}_{V,\,\,E}}>0,\,\,{{(dG)}_{T,\,\,P}}<0$

C) ${{(dS)}_{V,\,\,E}}=0,\,\,{{(dG)}_{T,\,\,P}}=0$

D) ${{(dS)}_{V,\,\,E}}=0,\,\,{{(dG)}_{T,\,\,P}}>0$

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• question_answer174) Which one of the following characteristics is not correct for physical adsorption?

A) Adsorption on solids is reversible

B) Adsorption increases with increase in temperature

C) Adsorption is spontaneous

D) Both enthalpy and entropy of adsorption are negative

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• question_answer175) In the respect of the equation$k=A{{e}^{-{{E}_{a}}/RT}}$ in chemical kinetics, which one of the following statements is correct?

A) $k$is equilibrium constant

B) $A$is adsorption factor

C) ${{E}_{a}}$is energy of activation

D) $R$is Rydberg constant

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• question_answer176) Standard reduction electrode potentials of three metals $A,\,\,B$ and $C$are$+0.5\,\,V,\,\,3.0\,\,V$and $-1.2\,\,V$ respectively. The reducing power of these metals are

A) $B>C>A$

B) $A>B>C$

C) $C>B>A$

D) $A>C>B$

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• question_answer177) Which one of the following substances has the highest proton affinity?

A) ${{H}_{2}}O$

B) ${{H}_{2}}S$

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

D) $P{{H}_{3}}$

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• question_answer178) Which one of the following is an amphoteric oxide?

A) $ZnO$

B) $N{{a}_{2}}O$

C) $S{{O}_{2}}$

D) ${{B}_{2}}{{O}_{3}}$

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• question_answer179) The substance used in Holmes signals of the ship is a mixture of

A) $Ca{{C}_{2}}+C{{a}_{3}}{{P}_{2}}$

B) $C{{a}_{3}}{{(P{{O}_{4}})}_{2}}+P{{b}_{3}}{{O}_{4}}$

C) ${{H}_{3}}P{{O}_{4}}+CaC{{l}_{2}}$

D) $N{{H}_{3}}+HOCl$

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• question_answer180) The number of $d-$electrons retained in $(At.\,no.\,\,Fe=26)$ions is

A) $3$

B) $4$

C) $5$

D) $6$

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• question_answer181) In the coordination compound,${{K}_{4}}[Ni{{(CN)}_{4}}]$, the oxidation state of nickel is

A) $-1$

B) $0$

C) $+1$

D) $+2$

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• question_answer182) Ammonia forms the complex ion${{[Cu{{(N{{H}_{3}})}_{4}}]}^{2+}}$ with copper ions in the alkaline solutions but not in acidic solutions. What is the reason for it?

A) In acidic solutions hydration protects copper ions

B) In acidic solutions protons coordinate with ammonia molecules forming $NH_{4}^{+}$ ions and $N{{H}_{3}}$ molecules are not available

C) In alkaline solutions insoluble $Cu{{(OH)}_{2}}$ is precipitated which is soluble in excess of any alkali

D) Copper hydroxide is an amphoteric substance

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• question_answer183) The radionuclide $_{90}^{234}Th$ undergoes two successive $\beta -$decays followed by one$\alpha -$decay. The atomic number and the mass number respectively of the resulting radionuclide are

A) 92 and 234

B) 94 and 230

C) 90 and 230

D) 92 and 230

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• question_answer184) The half-life of a radioactive isotope is$3\,\,h$. If the initial mass of the isotope were $256\,\,g$, the mass of it remaining undecayed after $18\,\,h$ would be

A) $4.0\,\,g$

B) $8.0\,\,g$

C) $12.0\,\,g$

D) $16.0\,\,g$

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• question_answer185) Several blocks of magnesium are fixed to the bottom of a ship to

A) keep away the sharks

B) make the ship lighter

C) prevent action of water and salt

D) prevent puncturing by under-sea rocks

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• question_answer186) In curing cement plasters water is sprinkled from time to time. This helps in

A) keeping it cool

B) developing interlocking needle-like crystals of hydrated silicates

C) hydrating sand and gravel mixed with cement

D) converting sand into silicic acid

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• question_answer187) The correct order of increasing basic nature for the bases$N{{H}_{3}},\,\,C{{H}_{3}}N{{H}_{2}}$and${{(C{{H}_{3}})}_{2}}NH$is

A) $C{{H}_{3}}N{{H}_{2}}<N{{H}_{3}}<{{(C{{H}_{3}})}_{2}}NH$

B) ${{(C{{H}_{3}})}_{2}}NH<N{{H}_{3}}<C{{H}_{3}}N{{H}_{2}}$

C) $N{{H}_{3}}<C{{H}_{3}}N{{H}_{2}}<{{(C{{H}_{3}})}_{2}}NH$

D) $C{{H}_{3}}N{{H}_{2}}<{{(C{{H}_{3}})}_{2}}NH<N{{H}_{3}}$

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• question_answer188) Butene-1 may be converted to butane by reaction with

A) $Zn-HCl$

B) $Sn-HCl$

C) $Zn-Hg$

D) $Pd/{{H}_{2}}$

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• question_answer189) The solubilities of carbonates decrease down the magnesium group due to a decrease in

A) lattice energies of solids

B) hydration energies of cations

C) inter-ionic attraction

D) entropy of solution formation

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• question_answer190) During dehydration of alcohols to alkenes by heating with concentrated ${{H}_{2}}S{{O}_{4}}$ the initiation step is

A) protonation of alcohol molecule

B) formation of carbocation

C) elimination of water

D) formation of an ester

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• question_answer191) Which one of the following nitrates will leave behind a metal on strong heating?

A) Ferric nitrate

B) Copper nitrate

C) Manganese nitrate

D) Silver nitrate

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• question_answer192) When rain is accompanied by a thunderstorm, the collected rain water will have a pH value

A) slightly lower than that of rain water without thunderstorm

B) slightly higher than that when the thunderstorm is not there

C) uninfluenced by occurrence of thunderstorm

D) which depends on the amount of dust in air

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• question_answer193) Complete hydrolysis of cellulose gives

A) D-fructose

B) D-ribose

C) D-glucose

D) L-glucose

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• question_answer194) The substance not likely to contain$CaC{{O}_{3}}$is

A) a marble statue

B) calcined gypsum

C) sea shells

D) dolomite

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• question_answer195) The reason for double helical structure of DNA is operation of

A) van der Waals forces

B) dipole-dipole interaction

C) hydrogen bonding

D) electrostatic attractions

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• question_answer196) Ethyl isocyanide on hydrolysis in acidic medium generates

A) ethylamine salt and methanoic acid

B) propanoic acid and ammonium salt

C) ethanoic acid and ammonium salt

D) methylamine salt and ethanoic acid

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• question_answer197) The internal energy change when a system goes from state $A$ to $B$ is$40\,\,kJ/mol$. If the system goes from $A$ to $B$ by a reversible path and returns to state $A$ by an irreversible path, what would be the net change in internal energy?

A) $40\,\,kJ$

B) $40\,\,kJ$

C) $<40\,\,kJ$

D) $Zero$

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• question_answer198) The reaction of chloroform with alcoholic $KOH$ and $p-$toluidine form

A) B) C) D) View Answer play_arrow
• question_answer199) Nylon threads are made of

A) polyvinyl polymer

B) polyester polymer

C) polyamide polymer

D) polyethylene polymer

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• question_answer200) Which of the following could act as a propellant for rockets?

A) Liquid hydrogen + liquid nitrogen

B) Liquid oxygen + liquid argon

C) Liquid hydrogen + liquid oxygen

D) Liquid nitrogen + liquid oxygen

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• question_answer201) The trisomy for 21st chromosome is called

A) Downs syndrome

B) Turners syndrome

C) Sickle cell anaemia

D) Klinefelters syndrome

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• question_answer202) Mammalian thymus is mainly concerned with

A) regulation of body temperature

B) regulation of body growth

C) immunological functions

D) secretion of thyrotropin

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• question_answer203) Which of the following is the largest gland in an adult man?

A) Thymus

B) Liver

C) Thyroid

D) Pancreas

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• question_answer204) In Pheretima, septa are absent between which segments?

A) 3/4 and 9/10

B) 4/5 and 8/9

C) 5/6 and 7/8

D) 7/8 and 6/7

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• question_answer205) During emergency which of the following hormone is secreted?

A) Aldosterone

B) Thyroxir

C) Adrenaline

D) Calcitoni

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• question_answer206) In which of the following animals, respiration occurs without any respiratory organ?

A) Frog

B) Fish

C) Cockroach

D) Earthworm

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• question_answer207) In cockroach, larval and nymphal characters are maintained by

A) ecdysone

B) salivary glands

C) parotid gland

D) juvenile hormone

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• question_answer208) Which of the following is a transparent tissue?

A) Tendon

B) Fibrous cartilage

C) Hyaline cartilage

D) All of these

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• question_answer209) Rh factor is present in

A) all vertebrates

B) all mammals

C) all reptiles

D) man and rhesus monkey only

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• question_answer210) In rabbit, end of a long bone is connected in another by

A) tendon

B) ligaments

C) muscle

D) cartilage

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• question_answer211) Which of the following cell type is capable of giving rise to other cell types in sponges?

A) Thesocytes

B) Pinacocytes

C) Cnidocytes

D) Archaeocytes

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• question_answer212) Thigmotaxis is not shown by

A) Paramecium

B) Amoeba

C) Ascaris

D) Hydra

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• question_answer213) Which is correctly matched?

A) Apiculture - Honey bee

B) Pisciculture - Silk moth

C) Sericulture - Fish

D) Aquaculture - Mosquito

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• question_answer214) Changes that allow the conversion of larva into adult, is called

A) metagenesis

B) alternation

C) metamorphosis

D) metastasis

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• question_answer215) Animals having a built in thermostat to maintain constant body temperature are known as

A) biothermic

B) poikilothermic

C) oligothermic

D) homeothermic

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• question_answer216) The intermediate host of Schistosoma is

A) snail

B) mosquito

C) housefly

D) sheep

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• question_answer217) The islets of Langerhans are found in

A) pancreas

B) stomach

C) liver

D) alimentary canal

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• question_answer218) The vitamin which is essential for blood clotting is

A) vitamin-A

B) vitamin-B

C) vitamin-C

D) vitamin-K

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• question_answer219) The female genital pore of Pheretima posthuma located upon the segment

A) 14th

B) 16th

C) 18th

D) 15th

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• question_answer220) Polyp phase is absent in

A) Hydra

B) Aurelia

C) Physalia

D) Obelia

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• question_answer221) In frog heart, there are cardiac muscles which consists of fibres called

A) Purkinje fibres

B) myonemes

C) telodendria

D) columnae camae

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• question_answer222) Malpighian tubules are

A) excretory organs of insects

B) excretory organs of frog

C) respiratory organs of insects

D) endocrine glands of insects

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• question_answer223) LH and FSH are collectively called

A) oxytocin

B) somatotropins

C) luteotropic

D) gonadotropins

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• question_answer224) Who is known as father of Endocrinology?

A) RH Whittaker

B) Pasteur

C) Einthoven

D) Thomas Addison

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• question_answer225) Which of the following provides most evident proof of evolution?

A) Fossils

B) Morphology

C) Embryo

D) Vestigial organs

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• question_answer226) In Mollusca, eye is present over a stalk, called

A) ostracum

B) operculum

C) ommatophores

D) osphradium

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• question_answer227) Among the following, colonial insects are

A) locusts

B) mosquitoes

C) white ants

D) bed bug

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• question_answer228) In Ascaris, the coelom is

A) schizocoelom

B) pseudocoelom

C) true coelom

D) haemocoelom

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• question_answer229) Turbellarians are free living

A) nematodes

B) cestodes

C) flat worms

D) trematodes

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• question_answer230) The characteristic larva of phylum- Coelenterata is

A) planula

B) cysticercus

C) rhabdiform

D) wriggler

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• question_answer231) In rabbit, head of epididymis present at the head of the testis is called

A) vas deferens

B) cauda epididymis

C) gubemaculum

D) caput epididymis

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• question_answer232) Tendons and ligaments are specialized types of

A) nervous tissue

B) muscular tissue

C) epithelial tissue

D) connective tissue

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• question_answer233) In blood, $C{{O}_{2}}$ in transported majorly as sodium

A) carbonate

B) carboxy haemoglobin

C) bicarbonate

D) $C{{O}_{2}}$ as such

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• question_answer234) Animals undergoes inactive stage during winter, is known as

A) aestivation

B) hibernation

C) adaptation

D) acclimatization

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• question_answer235) Kupffer cells are present in

A) liver

B) small intestine

C) pancreas

D) thyroid gland

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• question_answer236) The embryo at 16 celled stage is known as

A) morula

B) gastrula

C) blastula

D) blastomere

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• question_answer237) Contractile vacuole in protozoan Amoeba is meant for

A) respiration

B) excretion

C) locomotion

D) smoregulation

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• question_answer238) Jumping genes in maize were discovered by

A) Hugo de Vries

B) Barbara Me Clintock

C) TH Morgan

D) Mendel

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• question_answer239) Streptomycin is obtained from

A) Streptomyces griseus

B) S. aureofaciens

C) S. venezuelae

D) S. ramosus

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• question_answer240) Binomial system of nomenclature was given by

A) Julian Huxley

B) Bentham and Hooker

C) Linnaeus

D) Casper Bauhin

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• question_answer241) Indusium is found in

A) algae

B) ferns

C) moss

D) Cycas

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• question_answer242) The vacuole is lined by a membrane called

A) tonoplast

B) jacket

C) cell membrane

D) tonoplasm

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• question_answer243) Agar-agar is obtained from

A) Chlorella

B) Spirogyra

C) Ulothrix

D) Gelidium

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• question_answer244) DNA element with ability to change position is called

A) cistron

B) transposon

C) intron

D) recon

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• question_answer245) Initiation codon is

A) UUU

B) UGA

C) AUG

D) UAG

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• question_answer246) DNA multiplication is called

A) translation

B) replication

C) transduction

D) transcription

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• question_answer247) Duramen is present in

A) inner region of secondary wood

B) part of sap wood

C) outer region of secondary wood

D) region of pericycle

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• question_answer248) In plants, water supply is due to

A) osmosis

B) imbibition

C) guttation

D) adhesion force

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• question_answer249) Programmed cell death is scientifically termed as

A) autotomy

B) cell lysis

C) apoptosis

D) None of these

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• question_answer250) Paraffin wax is

A) ester

B) acid

C) monohydric alcohol

D) cholesterol

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• question_answer251) Which is always present in photochemical smog?

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

B) $C{{O}_{2}}$

C) $S{{O}_{2}}$

D) $C{{H}_{4}}$

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• question_answer252) In cell cycle, during which phase, chromosomes are arranged in equatorial plate?

A) Metaphase

B) Anaphase

C) Telophase

D) Prophase

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• question_answer253) The soil which is transported by wind is known as

A) colluvial

B) eolian

C) aluvial

D) galcial soil

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• question_answer254) Spindle fibre is made up of

A) tubulin

B) humulin

C) intermediate filament

D) flagellin

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• question_answer255) Lichen is the pioneer vegetation on which succession?

A) Hydrosere

B) Lithosere

C) Psammosere

D) Xerosere

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• question_answer256) Law of limiting factors was given by

A) Leibig

B) Blackman

C) Calvin

D) Arnon

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• question_answer257) In Pinus, male cone bears a large number of

A) ligules

B) anthers

C) micro-sporophylls

D) mega-sporophylls

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• question_answer258) Induction of flowering by low temperature treatment is

A) vernalization

B) cryobiology

C) photoperiodism

D) pruning

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• question_answer259) Decomposers are

A) autotrophs

B) autoheterotrophs

C) organotrophs

D) heterotrophs

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• question_answer260) Cleavage polyembryony occurs in

A) Pinus

B) Mini Cycas

C) Cycas

D) Ephedra

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• question_answer261) Edible part of mushroom is

A) basidiocarp

B) secondary mycelium

C) primary mycelium

D) tertiary mycelium

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• question_answer262) Which of the following plant product is the hardest?

A) Lignin

B) Cutin

C) Suberin

D) Sporopollenin

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• question_answer263) Calyptra is derived from

A) archegonia

B) capsule

C) antheridia

D) columella

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• question_answer264) Clamp connections are observed in

A) Basidiomycetes

B) Zygomycetes

C) Ascomycetes

D) Oomycetes

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• question_answer265) Leaf abscission is caused by

A) ABA

B) cytokinin

C) auxin

D) giberellin

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• question_answer266) What is the main cause for the extinction of some species in tropical forest?

A) Deforestation

B) Afforestation

C) Pollution

D) Soil erosin

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• question_answer267) Most accepted theory for ascent of sap is

A) capillarity theory

B) root pressure theory

C) pulsation theory

D) transpiration pull

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• question_answer268) Which enzyme converts glucose into alcohol?

A) Zymase

B) Diastase

C) Invertase

D) Lipase

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• question_answer269) Which of the following is not the feature of gymnosperms?

A) Parallel ventation

B) Perennial plants

C) Distinct branches (long and short branches)

D) Xylem with vessels

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• question_answer270) Which of the following is important for muscle contraction and nerve impulse transmission?

A) $C{{a}^{2+}}$ ions

B) $M{{g}^{2+}}$ ions

C) Both (a) and (b)

D) $F{{e}^{2+}}$ ions

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• question_answer271) The presence of diversity at the junction of territories of two different habitats is known as

A) bottle neck effect

B) edge effect

C) junction effect

D) Pasteur Effect

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• question_answer272) In which form does the food transported in plants?

A) Sucrose

B) Fructose

C) Glucose

D) Lactose

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• question_answer273) Lady finger belongs to family

A) Malvaceae

B) Cucurbitaceae

C) Liliaceae

D) Brassicaceae

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• question_answer274) In Cycas, pollination takes place in

A) 3 celled stage

B) 4 celled stage

C) 2 celled stage

D) 1 celled stage

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• question_answer275) The bioassay of auxin is

A) avena curvature test

B) callus formation

C) culture of fungus

D) seed dormancy

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• question_answer276) Which of these statements about Huntingtons disease is true?

A) Genetic tests to detect the presence of the allele responsible for Huntingtons disease do not exist at this time

B) The onset of Huntingtons disease is typically between birth and three year of age

C) There is currently no effective treatment of Huntingtons disease

D) Huntingtons disease is caused by the expression of a recessive allele

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• question_answer277) Which one is component of Ornithine cycle?

A) Ornithine, citrulline and alanine

B) Ornithine, citrulline and arginine

C) Amino acid are not used

D) Ornithine, cnitrulline and fumaric acid

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• question_answer278) Chromosome complement with 2n - 1 is called

A) monosomy

B) nullisomy

C) trisomy

D) tetrasomy

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• question_answer279) Energy transferred from one trophic level to another is

A) 5%

B) 10%

C) 15%

D) 20%

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• question_answer280) Small fish get stuck near the bottom of a shark and derives its nutrition from it. This kind of association is called as

A) antibiosis

B) commensalism

C) predation

D) parasitism

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• question_answer281) Which of the following is not vestigial in man?

A) Tail vertebrae

B) Nails

C) Nictitating membrane

D) Vermiform appendix

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• question_answer282) A eukaryotic gene contains two kinds of base sequences. Which of these plays an important role in protein synthesis?

A) Introns

B) Exons

C) Both (a) and (b)

D) None of these

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• question_answer283) The number of hydrogen bonds between adenine and thymine in a DNA molecule is

A) two

B) three

C) Four

D) eight

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• question_answer284) The group of Anamniota includes

A) Reptiles and birds

B) Birds and mammals

C) Fishes an amphibians

D) Reptiles and mammals

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• question_answer285) The excretory material of bony fish is

A) urea

B) protein

C) ammonia

D) amino acid

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• question_answer286) The leucocytes contain which of the following in large quantity?

A) Basophils

B) Neutrophils

C) Eosinophils

D) Monocytes

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• question_answer287) During inspiration, the diaphragm

A) expands

B) shows no change

C) contracts and flattens

D) relaxes to become dome-shaped

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• question_answer288) The function of pineal body is to

A) lighten the skin colours

B) control sexual behavior

C) regulates the period of puberty

D) All of the above

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• question_answer289) Synsacrum of fowl consists of about

A) 29 vertebrae

B) 3 vertebrae

C) 16 vertebrae

D) single vertebrae

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• question_answer290) Which of the following was formed in S Millers experiment?

A) Amino acids

B) Nucleic acids

C) UV radiations

D) Microspheres

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• question_answer291) Which of the following variations are temporary and have nothing to do with the last or next generation?

A) Hereditary variations

B) Discontinuous variations

C) Environmental variations

D) None of the above

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• question_answer292) The highest cranial capacity is was present in

A) Java man

B) Peking man

C) Handy man

D) Modem man

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• question_answer293) A marriage between normal visioned man and colourblind woman will produce which of the following types of offspring?

A) Normal sons and carrier daughters

B) Colourblind sons and carrier daughters

C) Colourblind sons and 50% carrier daughters

D) 50% colourblind sons and 50% carrier daughters

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• question_answer294) L-shaped chromosomes are also called

A) acrocentric

B) telocentric

C) sub-metacentric

D) None of the above

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• question_answer295) Which of the following is are grouped under phanerogams?

A) Angiosperms

B) Gymnosperms

C) Pteridophytes

D) Both (a) and (b)

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• question_answer296) A bacterium divides after every 35 min., if a culture containing ${{10}^{5}}$ cells per ml is grown, then cell concentration per ml after 175 min. will be

A) $175\times {{10}^{5}}$

B) $125\times {{10}^{5}}$

C) $48\times {{10}^{5}}$

D) $32\times {{10}^{5}}$

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• question_answer297) Double fertilization occurs among

A) algae

B) bryophytes

C) angiosperms

D) gymnosperms

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• question_answer298) Which of the following theory gives the latest explanation for the closure of stomata?

A) ABA theory

B) Munch theory

C) Starch glucose theory

D) Active ${{K}^{+}}$ transport theory

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• question_answer299) Biological concept of species is mainly based on

A) reproductive isolation

B) morphological features only

C) methods of reproduction only

D) morphology and methods of reproduction

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• question_answer300) In the treatment of waste water discharge, which treatment stage involves biological treatment?

A) Primary treatment

B) Secondary treatment

C) Tertiary treatment

D) Reverse osmosis stage

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