Solved papers for RAJASTHAN ­ PMT Rajasthan - PMT Solved Paper-2007

done Rajasthan - PMT Solved Paper-2007

  • question_answer1) In refraction, light waves are bent on passing from one medium to the second medium, because in the second medium

    A) the frequency is different

    B) the coefficient of elasticity is different

    C) the speed is different

    D) the amplitude is smaller

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  • question_answer2) An engine pumps up 100 kg of water through a height of 10 m in 5 s. Given that, the efficiency of engine is 60% If \[g=10\,m{{s}^{-2}}\] the power of this engine is

    A) 3.3 kW

    B) 0.33 kW

    C) 0.033 kW

    D) 33 kW

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  • question_answer3) The angular amplitude of a simple pendulum is \[{{}_{0.}}\]The maximum-tension in its string will be

    A) \[\text{mg(1-}{{}_{0.}})\]

    B) \[\text{mg}\,\text{(1+}{{}_{0.}})\]

    C) \[\text{mg}\,\text{(1-}_{0}^{2})\]

    D) \[\text{mg}\,\text{(1+}_{0}^{2})\]

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  • question_answer4) During the melting of a slab of ice at 273 K at atmospheric pressure

    A) positive work is done by the ice-water system on the atmosphere

    B) positive work is done on the ice-water system by the atmosphere

    C) internal energy of ice-water system decreases

    D) none of the above

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  • question_answer5) A solid sphere rolls down on two different inclined planes of same height, but of different inclinations. In both cases

    A) speed and time of descent will be same

    B) speed will be same, but time of descent will be different

    C) speed will be different, but time of descent will be same

    D) speed and time of descent both are different

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  • question_answer6) For inelastic collision between two spherical rigid bodies

    A) the total kinetic energy is conserved

    B) the linear momentum is not conserved

    C) the total mechanical energy is not conserved

    D) the linear momentum is conserved

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  • question_answer7) An object is kept on a smooth inclined plane of 1 in \[l.\] The horizontal acceleration to be imparted to the inclined plane so that the object is stationary relative to incline is

    A) \[g\sqrt{{{l}^{2}}-1}\]

    B) \[g({{l}^{2}}-1)\]

    C) \[\frac{g}{\sqrt{{{l}^{2}}-1}}\]

    D) \[\frac{g}{{{l}^{2}}-1}\]

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  • question_answer8) A point initially at rest moves along x-axis. Its acceleration varies with time as \[a=(6t+5)\,m/{{s}^{2}}\]. If it starts from origin, the distance covered in 2 s is

    A) 20 m

    B) 18 m

    C) 16 m

    D) 25 m

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  • question_answer9) A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distances of 2 m and 3 m respectively from the source. The ratio of the intensities of the waves at P and Q is

    A) 9 : 4

    B) 2 : 3

    C) 3 : 2

    D) 4 : 9

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  • question_answer10) Which of the following expressions is that of a simple harmonic progressive wave?

    A) \[a\,\sin \,\omega t\]

    B) \[a\,\sin \,(\omega t)\,\cos \,kx\]

    C) \[a\,\sin \,(\omega t-kx)\,\]

    D) \[a\cos kx\]

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  • question_answer11) If \[E=\] energy, \[G=\] gravitational constant, \[I=\] impulse and \[M=\]mass, then dimensions of \[{{\frac{G\operatorname{I}M}{{{E}^{2}}}}^{2}}\]are same as that of

    A) time

    B) mass

    C) length

    D) force

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  • question_answer12) At what speed, the velocity head of water is equal to pressure head of 40 cm of Hg?

    A) 10.3 m/s

    B) 2.8 m/s

    C) 5.6 m/s

    D) 8.4 m/s

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  • question_answer13) An electric fan is switched on in a closed room. The air in the room is

    A) cooled

    B) heated

    C) maintains its temperature

    D) heated or cooled depending on the atmospheric pressure

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  • question_answer14) If the electric flux entering and leaving an enclosed surface respectively are \[{{\phi }_{1}}\] and \[{{\phi }_{2,}}\] the electric charge inside the surface will be

    A) \[\frac{{{\phi }_{2}}-{{\phi }_{1}}}{{{\varepsilon }_{0}}}\]

    B) \[\frac{{{\phi }_{2}}+{{\phi }_{1}}}{{{\varepsilon }_{0}}}\]

    C) \[\frac{{{\phi }_{1}}-{{\phi }_{2}}}{{{\varepsilon }_{0}}}\]

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

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  • question_answer15) In the propagation of light waves, the angle between the direction of vibration and plane of polarization is

    A) \[0{}^\circ \]

    B) \[90{}^\circ \]

    C) \[45{}^\circ \]

    D) \[80{}^\circ \]

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  • question_answer16) How should people wearing spectacles work with a microscope?

    A) They should keep on wearing their spectacles

    B) They should take off their spectacles

    C) They may keep on wearing or take off their spectacles, it makes no difference

    D) They cannot use a microscope at all

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  • question_answer17) The root mean square and most probable speed of the molecules in a gas are

    A) same

    B) different

    C) cannot say

    D) depends on nature of the gas

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  • question_answer18) When you make ice cubes, the entropy of water

    A) does not change

    B) increases

    C) decreases

    D) may either increase or decrease depending on the process used

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  • question_answer19) An electron and proton enter a magnetic Held perpendicularly. Both have same kinetic energy. Which of the following is true?

    A) Trajectory of electron is less curved

    B) Trajectory of proton is less curved

    C) Both trajectories are equally curved

    D) Both move on straight line path

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  • question_answer20) In an L-R circuit, time constant is that time in which current grows from zero to the value where \[{{I}_{0}}\] is 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_answer21) The distance between two successive atomic planes of a calcite crystal is 0.3 nm. The minimum angle for Bragg scattering of \[0.3\,\overset{\text{o}}{\mathop{\text{A}}}\,\] X-rays will be

    A) \[1.43{}^\circ \]

    B) \[1.56{}^\circ \]

    C) \[2.86{}^\circ \]

    D) \[30{}^\circ \]

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  • question_answer22) A light emitting diode (I.ED) has a voltage drop of 2 V across it and passes a current of 10 n-I A. When it operates with a 6 V battery through a limiting resistor R, the value of R is

    A) 40 \[k\,\Omega \]

    B) \[4\,k\,\Omega \]

    C) 200 \[\,\Omega \]

    D) 400 \[\,\Omega \]

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  • question_answer23) The minimum potential difference between the base and emitter required to switch a silicon transistor ON is approximately?

    A) 1 V

    B) 3 V

    C) 5 V

    D) 4.2 V

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  • question_answer24) Two balloons are filled, one with pure He gas and the other by air, respectively. If the pressure and temperature of these balloons are same then the number of molecules per unit volume is

    A) more in the He filled balloon

    B) same in both balloons

    C) more in air filled balloon

    D) in the ratio of 1 : 4

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  • question_answer25) A spaceman in training is rotated in a seat at the end of a horizontal arm of length 5 m- If he can with is and acceleration up to 9g. then what is the maximum number of revolutions per second permissible ? (Take g =10 m/s )

    A) 13.5 rev/s

    B) 1.35 rev/s

    C) 0.675 rev/s

    D) 6.75 rev/s

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  • question_answer26) Two stones are projected with the same speed but making different angles with the horizontal. Their horizontal ranges are equal. The angle of projection of one is \[\frac{\pi }{3}\]and the maximum height reached by it is 102 m. Then the maximum height reached by the other in metre is

    A) 336

    B) 224

    C) 56

    D) 34

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  • question_answer27) A cosmonaut is orbiting earth in a spacecraft at an altitude h = 630 km with a speed of 8 km/s. If the radius of the earth is 6400 km, the acceleration of the cosmonaut is

    A) \[9.10\,m/{{s}^{2}}\]

    B) \[9.80\,m/{{s}^{2}}\]

    C) \[10.0\,m/{{s}^{2}}\]

    D) \[9.88\,m/{{s}^{2}}\]

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  • question_answer28) For two resistance wires joined in parallel, the resultant resistance is \[\frac{6}{5}\Omega .\] When one of the resistance wires breaks the effective resistance becomes \[2\,\Omega \] The resistance of the broken wire is

    A) \[\frac{3}{5}\,\Omega \]

    B) \[2\,\Omega \]

    C) \[\frac{6}{5}\,\Omega \]

    D) \[3\,\Omega \]

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  • question_answer29) When a p-n junction diode is reverse biased, then

    A) no current flows

    B) the depletion region is increased

    C) the depletion region is reduced

    D) the height of the potential barrier is reduced

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  • question_answer30) The operation of a nuclear reactor is said to be critical, if the multiplication factor (k) has a value

    A) 1

    B) 1.5

    C) 2.1

    D) 2.5

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  • question_answer31) Which one of the following is a possible nuclear reaction?

    A) \[_{5}^{10}B+_{2}^{4}He\xrightarrow{{}}_{7}^{13}N+_{1}^{1}H\]

    B) \[_{11}^{23}Na+_{1}^{1}H\xrightarrow{{}}_{10}^{20}Ne+_{2}^{4}He\]

    C) \[_{93}^{239}Np\xrightarrow{{}}_{94}^{239}Pu+\text{-+}\overset{-}{\mathop{v}}\,\]

    D) \[_{7}^{11}N_{1}^{1}H\xrightarrow{{}}_{6}^{12}C+\,{{}^{-}}+v\]

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  • question_answer32) Given below is a circuit diagram of an AM demodulator. For good demodulation of AM signal of carrier frequency\[f,\]the value of RC should be

    A) \[RC=\frac{1}{f}\]

    B) \[RC<\frac{1}{f}\]

    C) \[RC\ge \frac{1}{f}\]

    D) \[RC>>\frac{1}{f}\]

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  • question_answer33) The ionization energy of 10 times ionized sodium atom is

    A) \[\frac{13.6}{11}eV\]

    B) \[\frac{13.6}{{{(11)}^{2}}}eV\]

    C) \[13.6\times {{(11)}^{2}}eV\]

    D) \[13.6\,eV\]

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  • question_answer34) \[n\,\text{-}\]particles per second are being emitted by N atoms of a radioactive element. The half-life of element will be

    A) \[\left( \frac{n}{N}s \right)\]

    B) \[\left( \frac{N}{n} \right)s\]

    C) \[\frac{0.693N}{n}s\]

    D) \[\frac{0.693n}{N}s\]

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  • question_answer35) Two circular discs A and B with equal radii are blackened. They are heated to same temperature and are cooled under identical conditions. What inference do you draw from their cooling curves?

    A) A and B have .same specific heats

    B) Specific heat of A is less

    C) Specific heat of B is less

    D) Nothing can be said

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  • question_answer36) During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio\[\frac{{{C}_{p}}}{{{C}_{V}}}\] for the gas is

    A) \[\frac{4}{3}\]

    B) \[2\]

    C) \[\frac{3}{2}\]

    D) \[\frac{3}{2}\]

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  • question_answer37) A microscope is of cussed on a mark on a piece of paper and then a slab of glass of thickness 3 cm and refractive index 1.5 is placed over the mark. How should the microscope be moved to get the mark again in focus?

    A) 2 cm upward

    B) 1 cm upward

    C) 45 cm downward

    D) 1 cm downward

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  • question_answer38) The sum of two vectors \[\mathbf{\vec{A}}\] and \[\mathbf{\vec{B}}\] is at right angle to their difference. Then

    A) A = B

    B) A = 2B

    C) B = 2A

    D) \[\mathbf{\vec{A}}\]and \[\mathbf{\vec{B}}\] have the same direction

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  • question_answer39) The height \[y\] and the distance \[x\] along the horizontal plane of a projectile on a certain planet (with no surrounding atmosphere) are given by y = (8t - 5t) metre and x =- 6t metre where r is in seconds. The velocity of projection is

    A) 8 m/s

    B) 6 m/s

    C) 10 m/s

    D) Not obtained from the data

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  • question_answer40) A ball is thrown up at an angle with the horizontal. Then the total change of momentum by the instant it returns to ground is

    A) acceleration due to gravity x total time of night

    B) weight of the ball x half the time of flight

    C) weight of the ball x total time of flight

    D) weight of the ball x horizontal range

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  • question_answer41) When a spring is stretched by a distance x, it exerts a force, given by \[F=(5x-16{{x}^{3}})N\]The work done, when the spring is stretched from 0.1 m to 0.2 m is

    A) \[8.7\times {{10}^{-2}}\text{J}\]

    B) \[12.2\times {{10}^{-2}}\text{J}\]

    C) \[8.7\times {{10}^{-4}}\text{J}\]

    D) \[12.2\times {{10}^{-1}}\text{J}\]

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  • question_answer42) A hole is in the bottom of the tank having water. If total pressure at the bottom is 3 atm \[(1\,\text{atm=1}{{\text{0}}^{5}}\,N{{m}^{-2}}),\] then velocity of water flowing from hole is

    A) \[\sqrt{400}\,m{{s}^{-1}}\]

    B) \[\sqrt{600}\,m{{s}^{-1}}\]

    C) \[\sqrt{60}\,m{{s}^{-1}}\]

    D) None of these

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  • question_answer43) Time period of a simple pendulum of length (is \[{{T}_{1}}\]and time period of a uniform rod of the same length \[l\] pivoted about one end and oscillating in a vertical plane is \[{{T}_{2.}}\] Amplitude of oscillations in both the cases is small. Then \[\frac{{{T}_{1}}}{{{T}_{2}}}\] is

    A) \[\frac{1}{\sqrt{3}}\]

    B) \[1\]

    C) \[\sqrt{\frac{4}{3}}\]

    D) \[\sqrt{\frac{3}{2}}\]

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  • question_answer44) An insulator plate is passed between the plates of a capacitor. Then current

    A) first flows from A to Band then from B to A

    B) first flows from B to A and then from A to B

    C) always flows from B to A

    D) always flows from A to B

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  • question_answer45) Two parallel large thin metal sheets have equal surface charge densities \[(\sigma =26.4\times {{10}^{-12}}\,c/{{m}^{2}})\] of opposite signs. The electric field between these sheets is

    A) \[\text{1}\text{.5}\,\text{N/C}\]

    B) \[\text{1}\text{.5 }\!\!\times\!\!\text{ }\,\text{1}{{\text{0}}^{\text{-10}}}\,\text{N/C}\]

    C) \[3\,\text{N/C}\]

    D) \[\text{3 }\!\!\times\!\!\text{ }\,\text{1}{{\text{0}}^{\text{-10}}}\text{N/C}\]

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  • question_answer46) A circuit consists of five identical conductors as shown in figure. The two similar conductors are added as indicated by dotted lines. The ratio of resistances before and after addition will be

    A) \[\frac{7}{5}\]

    B) \[\frac{3}{5}\]

    C) \[\frac{5}{3}\]

    D) \[\frac{6}{5}\]

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  • question_answer47) The electric current passes through a metallic wire produces heat because of

    A) collisions of conduction electrons with each other

    B) collisions of the atoms of the metal with each other

    C) the energy released in the ionization of the atoms of the metal

    D) collisions of the conduction electrons with the atoms of the metallic wire

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  • question_answer48) Two concentric circular coils of ten turns each are situated in the same plane. Their radii are 20 cm and 40 cm and they carry respectively 0.2A and 0.3A currents in opposite direction. The magnetic field in tesla at the centre is

    A) \[\text{35}{{}_{\text{0}}}\text{/4}\]

    B) \[{{}_{\text{0}}}\text{/80}\]

    C) \[\text{7}{{}_{\text{0}}}\text{/80}\]

    D) \[\text{5}{{}_{\text{0}}}\text{/4}\]

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  • question_answer49) Electromagnetic waves with frequencies greater than the critical frequency of ionosphere cannot be used for communication using sky wave propagation, because

    A) the refractive index of the ionosphere becomes very high for \[f>{{f}_{c}}\]

    B) the refractive index of the ionosphere becomes very low for \[f>{{f}_{c}}\]

    C) the refractive index of the ionosphere becomes very high for \[f<{{f}_{c}}\]

    D) none of the above

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  • question_answer50) In a choke coil, the reactance\[{{X}_{L}}\]and resistance R are such that

    A) \[{{X}_{L}}=R\]

    B) \[{{X}_{L}}>>R\]

    C) \[{{X}_{L}}<<R\]

    D) \[{{X}_{L}}\infty \]

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  • question_answer51) If C and R denote capacity and resistance, the dimensions of CR are

    A) \[[{{M}^{0}}{{L}^{0}}T]\]

    B) \[[M{{L}^{0}}T]\]

    C) \[[{{M}^{0}}{{L}^{0}}{{T}^{2}}]\]

    D) not expressible in terms of M, L and T

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  • question_answer52) An arrow is shot into air. Its range is 200 m and its time of flight is 5 s. If \[g=10\,m/{{s}^{2}},\] then the horizontal component of velocity of the arrow is

    A) 12.5 m/s

    B) 25 m/s

    C) 31.25 m/s

    D) 40 m/s

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  • question_answer53) A force of 49 N is just able to move a block of wood weighing 10 kg on a rough horizontal surface. Its coefficient of friction is

    A) \[1\]

    B) 0.7

    C) 0.5

    D) zero

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  • question_answer54) Two bodies of masses m and 2m have equal kinetic energies. The ratio of their linear momenta is

    A) \[1\]

    B) \[\frac{1}{2}\]

    C) \[\frac{1}{\sqrt{2}}\]

    D) 2

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  • question_answer55) A ball of mass m elastically collides with a wall with velocity v, the n change in its momentum is equal to

    A) 2m

    B) 2mv

    C) 8 mv

    D) zero

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  • question_answer56) A solid sphere is rotating about a diameter at an angular velocity \[\omega .\] If it coots so that its radius reduces to \[\frac{1}{n}\] of its original value, its angular velocity becomes

    A) \[\frac{\omega }{n}\]

    B) \[\frac{\omega }{{{n}^{2}}}\]

    C) \[n\omega \]

    D) \[{{n}^{2}}\omega \]

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  • question_answer57) Two satellites A and B go around a planet P in circular orbits having radius 4R and R respectively. If the speed of satellite A is 3v, then the speed of satellite B will be

    A) 6 v

    B) 9 v

    C) 3 v

    D) none of these

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  • question_answer58) When a drop splits up into a number of drops, then

    A) area decreases

    B) volume increases

    C) energy is absorbed

    D) energy is liberated

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  • question_answer59) A 5 m aluminium wire \[\text{(Y=7 }\!\!\times\!\!\text{ 1}{{\text{0}}^{\text{10}}}\text{N/}{{\text{m}}^{\text{2}}}\text{)}\] of diameter 3 mm supports a 40 kg mass. In order to have the same elongation in a copper wire \[\text{(Y=12 }\!\!\times\!\!\text{ 1}{{\text{0}}^{\text{10}}}\text{N/}{{\text{m}}^{\text{2}}}\text{)}\] of the same length under the same weight, the diameter should be in mm

    A) 1.75

    B) 2.0

    C) 2.3

    D) 5.0

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  • question_answer60) At which of the following temperatures, the value of surface tension of water is minimum?

    A) \[4{}^\circ C\]

    B) \[25{}^\circ C\]

    C) \[50{}^\circ C\]

    D) \[75{}^\circ C\]

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  • question_answer61) In isochoric process

    A) \[\Delta W=0\]

    B) \[\Delta U=0\]

    C) \[\Delta Q=0\]

    D) \[\Delta T=0\]

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  • question_answer62) If the temperature difference on the two sides of a wall increases from \[100{}^\circ C\] to \[200{}^\circ C\], its thermal conductivity

    A) remains unchanged

    B) is doubled

    C) is halved

    D) becomes four times

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  • question_answer63) Let there be four articles having colors blue, red, black and white. When they are heated together and allowed to cool, which article will cool at the earliest?

    A) Blue

    B) Red

    C) Black

    D) White

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  • question_answer64) An ideal gas is taken through the cycle \[A\to B\to C\to A,\] as shown in figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process. \[C\to A\] is

    A) - 5 J

    B) - 10 J

    C) -15 J

    D) -20 J

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  • question_answer65) A piece of red glass when heated in dark to red hot state will appear to be

    A) white

    B) red

    C) green

    D) invisible

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  • question_answer66) The period of oscillation of a simple pendulum of constant length al surface of the earth is T. Its time period inside a mine will be

    A) cannot be compared

    B) equal to T

    C) less than T

    D) more than T

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  • question_answer67) A particle executing simple harmonic motion has a time period of 4s. After how much interval of time from t = 0 will its displacement be half of its amplitude ?

    A) \[\frac{1}{3}s\]

    B) \[\frac{1}{2}s\]

    C) \[\frac{2}{3}s\]

    D) \[\frac{1}{6}s\]

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  • question_answer68) A train approaches a stationary observer, the velocity of train being \[\frac{1}{20}\] of the velocity of sound. A sharp blast is blown with the whistle of the engine at equal intervals of a second. The interval between the successive blasts as heard by the observer is

    A) \[\frac{1}{20}s\]

    B) \[\frac{1}{20}\min \]

    C) \[\frac{19}{20}s\]

    D) \[\frac{19}{20}\min \]

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  • question_answer69) Which of the following equations represents a wave travelling along y-axis ?

    A) \[y=A\,\sin \,(kx-\omega t)\]

    B) \[x=A\,\sin \,(ky-\omega t)\]

    C) \[y=A\,\sin \,(ky\cos \omega t\]

    D) \[y=A\,\,\cos ky\sin \omega t\]

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  • question_answer70) The difference between soft and hard X-rays is of

    A) velocity

    B) intensity

    C) frequency

    D) polarization

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  • question_answer71) The capacity of an isolated conducting sphere of radius R is proportional to

    A) \[{{R}^{2}}\]

    B) \[\frac{1}{{{R}^{2}}}\]

    C) \[\frac{1}{R}\]

    D) \[R\]

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  • question_answer72) Two spheres of radii \[{{R}_{1}}\] and \[{{R}_{2}}\] respectively are charged and joined by a wire. The ratio of electric fields of spheres is

    A) \[\frac{R\,_{2}^{2}}{R_{1}^{2}}\]

    B) \[\frac{R\,_{1}^{2}}{R_{2}^{2}}\]

    C) \[\frac{R{{\,}_{2}}}{{{R}_{1}}}\]

    D) \[\frac{R{{\,}_{1}}}{{{R}_{2}}}\]

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  • question_answer73) If a positive charge is shifted from a low potential region to a high potential region, then electric potential energy

    A) decreases

    B) increases

    C) remains the same

    D) may increase or decrease

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  • question_answer74) The equivalent resistance between A and B is

    A) \[10\,\Omega \]

    B) \[20\,\Omega \]

    C) \[30\,\Omega \]

    D) \[40\,\Omega \]

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  • question_answer75) An electrical cable of copper has just one wire of radius 9 mm. Its resistance is \[5\,\Omega \] The single, wire of the cable is replaced by 6 different well insulated copper wires each of radius 3 mm. The total resistance of the cable will now be equal to

    A) \[270\,\Omega \]

    B) \[90\,\Omega \]

    C) \[45\,\Omega \]

    D) \[7.5\,\Omega \]

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  • question_answer76) A current of 2 A flowing through a conductor produces 80 Jot heat in 10s. The resistances of the conductor is

    A) \[0.5\,\Omega \]

    B) \[2\,\Omega \]

    C) \[4\,\Omega \]

    D) \[20\,\Omega \]

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  • question_answer77) A thermoelectric refrigerator works on

    A) Joule effect

    B) Seebeck effect

    C) Peltier effect

    D) Thermionic effect

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  • question_answer78) A small circular flexible loop of wire of radius. \[r\] carries a current\[I.\]It is placed in a uniform magnetic field B. The tension in the loop will be doubled if

    A) \[I\] is halved

    B) B is halved

    C) r is doubled

    D) both B and \[I\] are doubled

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  • question_answer79) Two parallel wires carrying currents in the same direction attract each other because of

    A) potential difference between them

    B) mutual inductance between them

    C) electric force between them

    D) magnetic force between them

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  • question_answer80) A hydrogen atom is paramagnetic. A hydrogen molecule is

    A) diamagnetic

    B) paramagnetic

    C) ferromagnetic

    D) none of these

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  • question_answer81) A galvanometer has resistance of \[400\,\Omega \] am deflects full scale for current of 0.2mA through it. The shunt resistance required to convert into 3 A ammeter is

    A) \[0.027\,\Omega \]

    B) \[0.054\,\Omega \]

    C) \[0.0135\,\Omega \]

    D) none of these

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  • question_answer82) the power factor of a series L-C-R circuit when at resonance is

    A) zero

    B) 0.5

    C) 1.0

    D) depends on values of L, C and R

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  • question_answer83) For high frequency, capacitor offers

    A) more resistance

    B) less resistance

    C) zero resistance

    D) none of these

    View Answer play_arrow
  • question_answer84) In an oscillating L-C 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 field is

    A) \[\frac{Q}{2}\]

    B) \[\frac{Q}{\sqrt{2}}\]

    C) \[\frac{Q}{\sqrt{3}}\]

    D) \[\frac{Q}{3}\]

    View Answer play_arrow
  • question_answer85) If\[{{v}_{g,}}\] \[{{v}_{x,}}\] and \[{{v}_{m,}}\] are the speeds of gamma rays, X-rays and microwaves respectively in vacuum then

    A) \[{{v}_{g,}}>{{v}_{m}}>{{v}_{x}}\]

    B) \[{{v}_{g}}>{{v}_{x}}>{{v}_{m}}\]

    C) \[{{v}_{g}}={{v}_{x}}={{v}_{m}}\]

    D) none of these

    View Answer play_arrow
  • question_answer86) A person standing in front of a mirror finds his image larger than himself. This implies that the mirror is

    A) convex

    B) parabolic

    C) plane

    D) concave

    View Answer play_arrow
  • question_answer87) For a telescope, larger the diameter of the objective lens

    A) greater is the resolving power

    B) smaller is the resolving power

    C) greater is the magnifying power

    D) smaller is the magnifying power

    View Answer play_arrow
  • question_answer88) If [he critical angle for total internal reflection from medium to vacuum is \[30{}^\circ \], the velocity of light in medium is

    A) \[3\times {{10}^{8}}\,m/s\]

    B) \[1.5\times {{10}^{8}}\,m/s\]

    C) \[6\times {{10}^{8}}\,m/s\]

    D) \[\sqrt{3}\,\times {{10}^{8}}\,m/s\]

    View Answer play_arrow
  • question_answer89) The deviation is maximum for which colour?

    A) Violet

    B) Red

    C) Blue

    D) Green

    View Answer play_arrow
  • question_answer90) In single slit diffraction pattern

    A) central fringe has negligible width than others

    B) all fringes are of same width

    C) central fringe does not exist

    D) none of the above

    View Answer play_arrow
  • question_answer91) The relation between amplification factor \[(\mu ),\] plate resistance \[({{r}_{p}})\]and mutual conductance \[({{g}_{m}})\]of a triode valve is given by

    A) \[\mu ={{r}_{p}}\times {{g}_{m}}\]

    B) \[{{r}_{p}}=\mu \times {{g}_{m}}\]

    C) \[{{g}_{m}}=\mu \times {{r}_{p}}\]

    D) none of these

    View Answer play_arrow
  • question_answer92) A light of wavelength \[5000\overset{\text{o}}{\mathop{\text{A}}}\,\] falls on a sensitive plate with photoelectric work function 1.90 eV. Kinetic energy of the emitted photoelectrons will be (Given, \[(\text{Give}\,\text{n,}\,\text{h=6}\text{.62}\times \text{1}{{\text{0}}^{-34}}\text{J-s})\]

    A) 0.1 eV

    B) 2 eV

    C) 0 58 eV

    D) 1.581 eV

    View Answer play_arrow
  • question_answer93) An electron with kinetic energy 5 eV is incident on an H-atom in its ground state. The collision

    A) must be elastic

    B) may be partially elastic

    C) may be completely elastic

    D) may be completely inelastic

    View Answer play_arrow
  • question_answer94) The emission of electrons is possible by

    A) photoelectric effect

    B) thermionic effect

    C) both (a) and (b)

    D) none of the above

    View Answer play_arrow
  • question_answer95) An electron and a proton are possessing same amount of kinetic energies. The de-Broglie wavelength is greater for

    A) electron

    B) proton

    C) both (a) and (b)

    D) none of these

    View Answer play_arrow
  • question_answer96) In a sample of radioactive -material, what percentage of the initial number of active nuclei will decay during one mean life?

    A) 37%

    B) 50%

    C) 63%

    D) 69.3%

    View Answer play_arrow
  • question_answer97) For the stability of any nucleus

    A) binding energy per nucleon will he more

    B) binding energy per nucleon wilt be less

    C) number of electrons will be more

    D) none of the above

    View Answer play_arrow
  • question_answer98) If the half-life of any sample of radioactive substance is 4 days, then the fraction of sample will remain undecayed after 2 days, will be?

    A) \[\sqrt{2}\]

    B) \[\frac{1}{\sqrt{2}}\]

    C) \[\frac{\sqrt{2}-1}{\sqrt{2}}\]

    D) \[\frac{1}{2}\]

    View Answer play_arrow
  • question_answer99) A sensitive magnetic instrument can be shielded very effectively from outside fields by placing it inside a box of

    A) teak wood

    B) plastic material

    C) soft iron of high permeability

    D) a metal of high conductivity

    View Answer play_arrow
  • question_answer100) An n-type semiconductor is

    A) negatively charged

    B) positively charged

    C) neutral

    D) None of the above

    View Answer play_arrow
  • question_answer101) The compound in which underlined carbon uses only its \[s{{p}^{3}}\] hybrid orbitals for bond formation is

    A) \[C{{H}_{3}}\underline{C}OOH\]

    B) \[C{{H}_{3}}\underline{C}ON{{H}_{2}}\]

    C) \[C{{H}_{3}}\underline{C}{{H}_{2}}OH\]

    D) \[C{{H}_{3}}\underline{C}H=C{{H}_{2}}\]

    View Answer play_arrow
  • question_answer102) \[t-\]butyl alcohol is

    A) 2-methyl-propan-2-ol

    B) 2-methyl-propan-1-ol

    C) 3-methyt-buian-1-ol

    D) 3-methyl-butan-2-ol

    View Answer play_arrow
  • question_answer103) Optical isomerism is shown by

    A) propanol-2

    B) butanol-2

    C) ethanol

    D) methanol

    View Answer play_arrow
  • question_answer104) When\[{{C}_{2}}{{H}_{2}},\,\,C{{H}_{4}}\]and \[{{C}_{2}}{{H}_{4}}\] passes through a test tube which have ammoniacal \[C{{u}_{2}}C{{l}_{2}}\], find out which gas comes out unaffected from test tube?

    A) \[{{C}_{2}}{{H}_{2}}\]and\[C{{H}_{4}}\]

    B) \[{{C}_{2}}{{H}_{2}}\]and\[{{C}_{2}}{{H}_{4}}\]

    C) \[{{C}_{2}}{{H}_{4}}\]and\[C{{H}_{4}}\]

    D) \[{{C}_{2}}{{H}_{2}}\]

    View Answer play_arrow
  • question_answer105) If a mixture of \[CO\] and \[{{N}_{3}}\] in equal amount have total \[1\,\,atm\] pressure, find out partial pressure of \[{{N}_{3}}\] in mixture

    A) \[1\,\,atm\]

    B) \[0.50\,\,atm\]

    C) \[2\,\,atm\]

    D) \[3\,\,atm\]

    View Answer play_arrow
  • question_answer106) Which does not reacts with Fehling solution?

    A) \[C{{H}_{3}}CHO\]

    B) \[{{C}_{6}}{{H}_{5}}CHO\]

    C) \[C{{H}_{3}}COC{{H}_{3}}\]

    D) Glucose

    View Answer play_arrow
  • question_answer107) When hydrogen molecules decomposed into its atoms which conditions gives maximum yields of \[H\] atoms?

    A) High temperature and low pressure

    B) Low temperature and high pressure

    C) High temperature and high pressure

    D) Low temperature and low pressure

    View Answer play_arrow
  • question_answer108) Lithopone is

    A) \[ZnS{{O}_{4}}+PbS\]

    B) \[BaS{{O}_{4}}+ZnS\]

    C) \[Pb{{O}_{2}}\]

    D) \[ZnS{{O}_{4}}\]

    View Answer play_arrow
  • question_answer109) Natural rubber is a polymer of

    A) styrene

    B) chloroprene

    C) \[C{{H}_{2}}=\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,-CH=C{{H}_{2}}\]or isopropene

    D) 1, 3-butadiene

    View Answer play_arrow
  • question_answer110) \[PC{{l}_{3}}\] is possible but \[NC{{l}_{5}}\] does not exist

    A) in \[N,\,\,d-\]sub-shell is absent

    B) ionization energy of \[N\] is very high

    C) it does not like\[Cl\]

    D) none of the above

    View Answer play_arrow
  • question_answer111) \[_{11}N{{a}^{23}}\] is formed from \[_{11}N{{a}^{24}}\] by the

    A) \[_{0}{{n}^{1}}\] emission

    B) \[\beta -\]emission

    C) \[K-\]electron capture

    D) \[\alpha -\]emission

    View Answer play_arrow
  • question_answer112) Glucose reacts with excess of phenyl hydrazine and forms

    A) glucosazone

    B) glucose phenyl hydrazine

    C) glucose oxime

    D) sorbitol

    View Answer play_arrow
  • question_answer113) Which is purified by steam distillation?

    A) Aniline

    B) Benzoic Acid

    C) Petroleum

    D) Naphthalene

    View Answer play_arrow
  • question_answer114) Which compound is aromatic?

    A)

    B)

    C)

    D)

    View Answer play_arrow
  • question_answer115) Which does not replace hydrogen from\[HCl\]?

    A) \[Cu\]

    B) \[Mg\]

    C) \[Na\]

    D) \[Al\]

    View Answer play_arrow
  • question_answer116) For prevention of rusting to iron, paints of which is used?

    A) \[PbO\]

    B) \[Pb{{O}_{2}}\]

    C) \[P{{b}_{3}}{{O}_{4}}\]

    D) \[PbS{{O}_{4}}\]

    View Answer play_arrow
  • question_answer117) A violet colour compound is formed in detection of \[S\] in a compound

    A) \[N{{a}_{4}}[Fe{{(CN)}_{5}}NOS]\]

    B) \[N{{a}_{3}}[Fe{{(CN)}_{5}}NOS]\]

    C) \[N{{a}_{2}}[Fe{{(CN)}_{5}}NOS]\]

    D) \[N{{a}_{2}}[Fe{{(CN)}_{5}}NO]\]

    View Answer play_arrow
  • question_answer118) Find out emf of cell, \[Zn;Z{{n}^{2+}}(1M)|\,|\,\,C{{u}^{2+}}(1M);\,\,Cu\,\,E{}^\circ \]for \[Z{{n}^{2+}}/Zn=-0.76;\,\,E{}^\circ for\,\,C{{u}^{2+}}/Cu=+0.34\]

    A) \[+1.10\,\,V\]

    B) \[-1.10\,\,V\]

    C) \[-0.76\]

    D) \[-0.42\]

    View Answer play_arrow
  • question_answer119) Radius of \[Ga\] is less than \[Al\] because of

    A) lanthenoid contraction

    B) greater screening effect

    C) inert pair effect

    D) none of the above

    View Answer play_arrow
  • question_answer120) Number of atoms of \[He\] in \[100\,\,amu\] of \[He\] (atomic\[\text{wt}\text{.}\] of\[He\] is 4) are

    A) \[25\]

    B) \[100\]

    C) \[50\]

    D) \[100\times 6\times {{10}^{-23}}\]

    View Answer play_arrow
  • question_answer121) . Which inert gas show abnormal behaviour on liquidation?

    A) \[Xe\]

    B) \[He\]

    C) \[Ar\]

    D) \[Kr\]

    View Answer play_arrow
  • question_answer122) Which has least gold number?

    A) Gelatin

    B) Starch

    C) Albumin

    D) Blood

    View Answer play_arrow
  • question_answer123) In a compound \[C,\,\,H\] and \[N\] are present in \[9:13.5\] by weight. If molecular weight of the compound is\[108\], then the molecular formula on the compound is

    A) \[{{C}_{2}}{{H}_{6}}{{N}_{2}}\]

    B) \[{{C}_{3}}{{H}_{4}}N\]

    C) \[{{C}_{6}}{{H}_{8}}{{N}_{2}}\]

    D) \[{{C}_{9}}{{H}_{12}}N\]

    View Answer play_arrow
  • question_answer124) In the following reaction, \[{{C}_{2}}{{H}_{2}}\xrightarrow[HgS{{O}_{4}}/{{H}_{2}}S{{O}_{4}}]{{{H}_{2}}O}XC{{H}_{3}}CHO\] What is\[X\]?

    A) \[C{{H}_{3}}C{{H}_{2}}OH\]

    B) \[C{{H}_{3}}-O-C{{H}_{3}}\]

    C) \[C{{H}_{3}}C{{H}_{2}}CHO\]

    D) \[C{{H}_{2}}=CHOH\]

    View Answer play_arrow
  • question_answer125) Which one of the following will most readily be dehydrated in acidic conditions?

    A)

    B)

    C)

    D)

    View Answer play_arrow
  • question_answer126) Indane is

    A) commercial butane, isobutane and propane mixture

    B) butane, ethane mixture

    C) commercial propane

    D) methane, propane mixture

    View Answer play_arrow
  • question_answer127) Which of the following is not Lewis acid?

    A) \[AlC{{l}_{3}}\cdot 6{{H}_{2}}O\]

    B) \[AlC{{l}_{3}}\]

    C) \[SnC{{l}_{4}}\]

    D) \[FeC{{l}_{3}}\]

    View Answer play_arrow
  • question_answer128) Blue vitriol is

    A) \[MgS{{O}_{4}}\cdot 5{{H}_{2}}O\]

    B) \[CuS{{O}_{4}}\cdot 5{{H}_{2}}O\]

    C) \[CaS{{O}_{4}}\cdot 5{{H}_{2}}O\]

    D) \[ZnS{{O}_{4}}\cdot 5{{H}_{2}}O\]

    View Answer play_arrow
  • question_answer129) Bleaching action of\[CaOC{{l}_{2}}\]is due to

    A) nascent oxygen

    B) chlorine

    C) \[HClO\]

    D) \[HCl\]

    View Answer play_arrow
  • question_answer130) Which of the following is act as pickling agent?

    A) \[HN{{O}_{3}}\]

    B) \[HCl\]

    C) \[{{H}_{2}}S{{O}_{4}}\]

    D) \[HN{{O}_{2}}\]

    View Answer play_arrow
  • question_answer131) In a closed insulated container, a liquid is stirred with a paddle to increase the temperature. Which of the following is true?

    A) \[\Delta E=W\ne 0,\,\,q=0\]

    B) \[\Delta E=W=q\ne 0\]

    C) \[\Delta E=W=q\ne 0\]

    D) \[W=0,\,\,\Delta E=q\ne 0\]

    View Answer play_arrow
  • question_answer132) The following data are for the decomposition of ammonium nitrite in aqueous solution

    Vol. of N2 in cc Time (min.)
    6.25 10
    9.00 15
    11.40 20
    13.65 25
    35.65 \[\infty \]
    The order of reaction is

    A) zero

    B) one

    C) two

    D) three

    View Answer play_arrow
  • question_answer133) In Arrhenius plot, intercepts is equal to

    A) \[\frac{-{{E}_{a}}}{R}\]

    B) \[\ln A\]

    C) \[\ln k\]

    D) \[{{\log }_{10}}a\]

    View Answer play_arrow
  • question_answer134) The total number of possible isomeric trimethyl benzene is

    A) 2

    B) 3

    C) 4

    D) 6

    View Answer play_arrow
  • question_answer135) An alkyl halide by formation of its Grignard reagent and heating with water yields propane. What is the original alkyl halide?

    A) Methyl iodide

    B) Ethyl iodide

    C) Ethyl bromide

    D) Propyl bromide

    View Answer play_arrow
  • question_answer136) The following reaction is known as

    A) Perkin reaction

    B) Gattermann reaction

    C) Kolbe reaction

    D) Gattermann-aldehyde reaction

    View Answer play_arrow
  • question_answer137) Acetone on distillation with conc.\[{{H}_{2}}S{{O}_{4}}\] forms

    A) phorone

    B) acrolein

    C) mesitylene

    D) mesityl oxide

    View Answer play_arrow
  • question_answer138) On treatment with ninhydrin which of the following give blue colour?

    A) Proteins

    B) Peptides

    C) \[\alpha -\]amino acids

    D) All of these

    View Answer play_arrow
  • question_answer139) Aldehyde with \[N{{H}_{2}}\cdot N{{H}_{2}}\] forms

    A) hydrazones

    B) aniline

    C) nitrobenzene

    D) none of these

    View Answer play_arrow
  • question_answer140) Allyl isocyanide contains \[\sigma \] and \[\pi \] bonds

    A) \[9\sigma ,\,\,3\pi \]

    B) \[9\sigma ,\,\,9\pi \]

    C) \[3\sigma ,\,\,4\pi \]

    D) \[5\sigma ,\,\,7\pi \]

    View Answer play_arrow
  • question_answer141) vant Hoff factor of \[Ca{{(N{{O}_{3}})}_{2}}\] is

    A) one

    B) two

    C) three

    D) four

    View Answer play_arrow
  • question_answer142) 1 mole of \[{{H}_{2}}\] and 2 moles of \[{{I}_{2}}\]are taken initially in \[a\,\,2\,\,I\]vessel. The number of moles of \[{{H}_{2}}\] at equilibrium is\[0.2\]. Then the number of moles of \[{{I}_{2}}\] and \[HI\] at equilibrium are

    A) \[1.2,\,\,1.6\]

    B) \[1.8,\,\,1.0\]

    C) \[0.4,\,\,2.4\]

    D) \[0.8,\,\,2.0\]

    View Answer play_arrow
  • question_answer143) Degree of dissociation of\[0.1\,\,N\,\,C{{H}_{3}}COOH\], is\[({{K}_{acid}}=1\times {{10}^{-5}})\]

    A) \[{{10}^{-5}}\]

    B) \[{{10}^{-4}}\]

    C) \[{{10}^{-3}}\]

    D) \[{{10}^{-2}}\]

    View Answer play_arrow
  • question_answer144) \[3A\to 2B\]rate of reaction\[\frac{+d[B]}{dt}\]is equal to

    A) \[-\frac{3}{2}\frac{d[A]}{dt}\]

    B) \[-\frac{2}{3}\frac{d[A]}{dt}\]

    C) \[-\frac{1}{3}\frac{d[A]}{dt}\]

    D) \[+2\frac{d[A]}{dt}\]

    View Answer play_arrow
  • question_answer145) The volume of water to be added to \[100\,\,c{{m}^{3}}\] of \[0.5\,\,N\,\,{{H}_{2}}S{{O}_{4}}\] to get decinormal concentration is

    A) \[400\,\,c{{m}^{3}}\]

    B) \[450\,\,c{{m}^{3}}\]

    C) \[500\,\,c{{m}^{3}}\]

    D) \[100\,\,c{{m}^{3}}\]

    View Answer play_arrow
  • question_answer146) The compressibility of a gas is less than unity at\[STP\]. Therefore,

    A) \[{{V}_{m}}>22.4\,\,L\]

    B) \[{{V}_{m}}<22.4\,\,L\]

    C) \[{{V}_{m}}=22.4\,\,L\]

    D) \[{{V}_{m}}=44.8\,\,L\]

    View Answer play_arrow
  • question_answer147) \[1.520\,\,g\] of hydroxide of a metal on ignition gave \[0.995\,\,g\] of oxide. The equivalent weight of metal is

    A) \[1.52\]

    B) \[0.995\]

    C) \[190\]

    D) \[9\]

    View Answer play_arrow
  • question_answer148) Which of the following oxide of nitrogen is most thermally stable?

    A) \[{{N}_{2}}{{O}_{5}}\]

    B) \[{{N}_{2}}O\]

    C) \[NO\]

    D) \[{{N}_{2}}{{O}_{3}}\]

    View Answer play_arrow
  • question_answer149) Which of the following gas is used in artificial respiration?

    A) \[{{O}_{2}}\]

    B) \[C{{O}_{2}}\]

    C) Helium

    D) All of these

    View Answer play_arrow
  • question_answer150) Which of the following gas is used in warfare?

    A) \[{{N}_{2}}O\]

    B) \[CC{{l}_{3}}\cdot N{{O}_{2}}\]

    C) \[C{{O}_{2}}\]

    D) \[{{O}_{2}}\]

    View Answer play_arrow
  • question_answer151) Essential compound to manufacture acrolein is

    A) glycerol

    B) benzene

    C) phenol

    D) ammonia

    View Answer play_arrow
  • question_answer152) Hybridization present in \[Cl{{F}_{3}}\] is

    A) \[s{{p}^{2}}\]

    B) \[s{{p}^{3}}\]

    C) \[ds{{p}^{2}}\]

    D) \[s{{p}^{3}}d\]

    View Answer play_arrow
  • question_answer153) Oxidation number of sulphur in \[{{H}_{2}}{{S}_{2}}{{O}_{8}}\] is

    A) \[+6\]

    B) \[+8\]

    C) \[+21\]

    D) \[+7\]

    View Answer play_arrow
  • question_answer154) Number of electrons surrounding \[Kr\] in\[Kr{{F}_{2}}\]is

    A) \[10\]

    B) \[6\]

    C) \[4\]

    D) \[8\]

    View Answer play_arrow
  • question_answer155) Reason of passivity of iron is

    A) \[F{{e}_{2}}{{O}_{3}}\]

    B) \[F{{e}_{3}}{{O}_{4}}\]

    C) \[FeO\]

    D) \[F{{e}_{2}}{{O}_{4}}\cdot 3{{H}_{2}}O\]

    View Answer play_arrow
  • question_answer156) Half-life of radioactive substance is 4 days. Amount of the substance decayed in two day is

    A) \[\frac{1}{\sqrt{2}}\]

    B) \[\left( 1-\frac{1}{\sqrt{2}} \right){{N}_{0}}\]

    C) \[20%\]

    D) \[\frac{1}{8}\]

    View Answer play_arrow
  • question_answer157) \[{{K}_{2}}Hg{{l}_{4}}\] is used to lest the following

    A) \[NH_{4}^{+}\]

    B) \[Cl\]

    C) \[Br\]

    D) \[I\]

    View Answer play_arrow
  • question_answer158) \[H-O-O\]bond angle in\[{{H}_{2}}{{O}_{2}}\]is

    A) \[{{90}^{o}}\]

    B) \[{{180}^{o}}\]

    C) \[{{109.5}^{o}}\]

    D) \[{{94.8}^{o}}\]

    View Answer play_arrow
  • question_answer159) Iodine is tested by the following reagent

    A) starch

    B) urea

    C) glucose

    D) glycerol

    View Answer play_arrow
  • question_answer160) Half-life of a radioactive element is

    A) \[0.693\]

    B) \[\frac{1}{0.693}\]

    C) \[\frac{0.693}{k}\]

    D) \[\frac{k}{0.693}\]

    View Answer play_arrow
  • question_answer161) Radioactive metal is

    A) \[Li\]

    B) \[Ce\]

    C) \[Na\]

    D) \[Ra\]

    View Answer play_arrow
  • question_answer162) Which has smallest size?

    A) \[N{{a}^{+}}\]

    B) \[M{{g}^{2+}}\]

    C) \[Ne\]

    D) \[{{O}^{2-}}\]

    View Answer play_arrow
  • question_answer163) Phenol on reaction with \[B{{r}_{2}}\] gives

    A) \[o-\]bromophenol

    B) \[p-\]bromophenol

    C) \[2,\,\,4,\,\,6-\]tribromophenol

    D) \[1,\,\,3,\,\,5-\]tribromobenzene

    View Answer play_arrow
  • question_answer164) Electron deficient molecule is

    A) \[CC{{l}_{4}}\]

    B) \[PC{{l}_{5}}\]

    C) \[B{{F}_{3}}\]

    D) \[S{{F}_{6}}\]

    View Answer play_arrow
  • question_answer165) Which is the correct relation for diffusion a gases?

    A) \[r\propto d\]

    B) \[r\propto \sqrt{d}\]

    C) \[r\propto \frac{1}{\sqrt{d}}\]

    D) None of these

    View Answer play_arrow
  • question_answer166) Aniline with \[CHC{{l}_{3}}\] and \[KOH\] on heating gives

    A) isocyanide

    B) cyanide

    C) phenol

    D) salicylic acid

    View Answer play_arrow
  • question_answer167) Geometrical isomerism is found in

    A) pemene-1

    B) propene

    C) 2-butene

    D) butene-1

    View Answer play_arrow
  • question_answer168) Most acidic is

    A)

    B)

    C)

    D)

    View Answer play_arrow
  • question_answer169) Hydrolysis of sodium acetate gives

    A) acidic solution

    B) basic solution

    C) amphoteric solution

    D) neutral solution

    View Answer play_arrow
  • question_answer170) Isotopic pair is

    A) \[_{20}{{X}^{40}},\,{{\,}_{21}}{{Y}^{40}}\]

    B) \[_{20}{{X}^{40}},\,{{\,}_{20}}{{X}^{41}}\]

    C) \[_{40}{{X}^{20}},\,{{\,}_{41}}{{X}^{20}}\]

    D) none of these

    View Answer play_arrow
  • question_answer171) \[Z\xrightarrow{PC{{l}_{5}}}X\xrightarrow{Alc.\,\,KOH}Y\xrightarrow[2{{H}_{2}}O/\Delta ]{conc.\,\,{{H}_{2}}S{{O}_{4}}}Z\] Here \[Z\] is

    A) \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-OH\]

    B) \[{{(C{{H}_{3}})}_{3}}-C-OH\]

    C) \[C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ OH \end{smallmatrix}}{\mathop{C}}\,H-C{{H}_{3}}\]

    D) none of the above

    View Answer play_arrow
  • question_answer172) Fuel, used in nuclear reactor is

    A) plutonium

    B) thorium

    C) radium

    D) deuterium

    View Answer play_arrow
  • question_answer173) Atomic number of an element is equal to the number of

    A) protons

    B) neutrons

    C) protons + electrons

    D) protons + neutrons

    View Answer play_arrow
  • question_answer174) Following pair is separated by yellow ammonium sulphide

    A) \[CdS,\,\,B{{i}_{2}}{{S}_{3}}\]

    B) \[B{{i}_{2}}{{S}_{3}},\,\,PbS\]

    C) \[PbS,\,\,HgS\]

    D) \[CdS,\,\,A{{g}_{2}}{{S}_{3}}\]

    View Answer play_arrow
  • question_answer175) Cationic hydrolysis gives the following solution

    A) acidic

    B) basic

    C) neutral

    D) amphoteric

    View Answer play_arrow
  • question_answer176) Which gives nucleophilic addition most easily?

    A) \[C{{H}_{3}}CHO\]

    B) \[C{{H}_{3}}C{{H}_{2}}CHO\]

    C) \[C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,HCHO\]

    D) \[HCHO\]

    View Answer play_arrow
  • question_answer177) Compound reacting with alkaline\[KMn{{O}_{4}}\]

    A) \[C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\overset{\begin{smallmatrix} OH \\ | \end{smallmatrix}}{\mathop{C}}}\,-C{{H}_{3}}\]

    B) \[C{{H}_{3}}-\overset{\begin{smallmatrix} OH \\ | \end{smallmatrix}}{\mathop{C}}\,H-C{{H}_{3}}\]

    C) \[{{(C{{H}_{3}})}_{3}}C-C{{H}_{2}}OH\]

    D) none of the above

    View Answer play_arrow
  • question_answer178) Lucas reagent reacts fastest with

    A) butanol-1

    B) butanol-2

    C) 2-methyl-propanol-2

    D) 2-methyl-propanol-1

    View Answer play_arrow
  • question_answer179) Reagent used to extract silver from \[A{{g}_{2}}S\] is

    A) \[NaCN\]

    B) \[NaCN\] in presence of\[{{O}_{2}}\]

    C) \[NaCl\]

    D) \[AgN{{O}_{3}}\]

    View Answer play_arrow
  • question_answer180) Number of moles of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] reduced by one mole of\[S{{n}^{2+}}\]?

    A) \[\frac{1}{3}\]

    B) \[3\]

    C) \[\frac{1}{6}\]

    D) \[6\]

    View Answer play_arrow
  • question_answer181) \[{{S}_{N}}2\]mechanism is involved in the following substitution

    A) \[C{{H}_{3}}-C{{H}_{2}}-Cl+O{{H}^{-}}\]

    B) \[C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\overset{\begin{smallmatrix} Cl \\ | \end{smallmatrix}}{\mathop{C}}}\,l-C{{H}_{3}}+O{{H}^{-}}\]

    C) \[C{{H}_{3}}-\overset{\begin{smallmatrix} Cl \\ | \end{smallmatrix}}{\mathop{C}}\,H-C{{H}_{3}}+O{{H}^{-}}\]

    D) \[C{{H}_{3}}-C{{H}_{2}}-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\overset{\begin{smallmatrix} Cl \\ | \end{smallmatrix}}{\mathop{C}}}\,-C{{H}_{3}}+O{{H}^{-}}\]

    View Answer play_arrow
  • question_answer182) Radioactive isotope of hydrogen is

    A) uranium

    B) deuterium

    C) tritium

    D) none of the above

    View Answer play_arrow
  • question_answer183) Electronic configuration of hydride ion is

    A) \[1{{s}^{0}}\]

    B) \[1{{s}^{1}}\]

    C) \[1{{s}^{2}}\]

    D) \[1{{s}^{1}}2{{s}^{1}}\]

    View Answer play_arrow
  • question_answer184) Suitable conditions for melting of ice

    A) high temperature and high pressure

    B) high temperature and low pressure

    C) low temperature and tow pressure

    D) low temperature and high pressure

    View Answer play_arrow
  • question_answer185) Least ionized salt is

    A) \[KCl\]

    B) \[AgCl\]

    C) \[MgC{{l}_{2}}\]

    D) \[CaC{{l}_{2}}\]

    View Answer play_arrow
  • question_answer186) Difference in the inching and boiling points of inert gases are

    A) large

    B) small

    C) no difference

    D) none of these

    View Answer play_arrow
  • question_answer187) Essential component of amalgam is

    A) \[Fe\]

    B) \[Pb\]

    C) \[Hg\]

    D) \[Cr\]

    View Answer play_arrow
  • question_answer188) Following is estimated by Liebig method

    A) \[C\]and\[H\]

    B) nitrogen

    C) chlorine

    D) bromine

    View Answer play_arrow
  • question_answer189) Inorganic graphite is

    A) \[BN\]

    B) \[B{{F}_{3}}\]

    C) \[{{B}_{2}}{{H}_{6}}\]

    D) none of these

    View Answer play_arrow
  • question_answer190) Nausadar is

    A) \[N{{H}_{4}}N{{O}_{3}}\]

    B) \[N{{H}_{4}}Cl\]

    C) \[{{(N{{H}_{4}})}_{2}}S{{O}_{4}}\]

    D) \[N{{H}_{4}}OH\]

    View Answer play_arrow
  • question_answer191) Number of unpaired electrons in \[{{O}_{2}}\] molecule is

    A) zero

    B) one

    C) two

    D) four

    View Answer play_arrow
  • question_answer192) Anode in the galvanic cell, is

    A) negative electrode

    B) positive electrode

    C) neutral electrode

    D) none of the above

    View Answer play_arrow
  • question_answer193) Normal solution is

    A) inert solution

    B) acidic solution

    C) one litre containing one equivalent

    D) basic solution

    View Answer play_arrow
  • question_answer194) In exothermic reaction, heat is

    A) given out

    B) absorbed

    C) not involved

    D) given out or absorbed

    View Answer play_arrow
  • question_answer195) Element having maximum electron affinity is

    A) fluorine

    B) chlorine

    C) bromine

    D) iodine

    View Answer play_arrow
  • question_answer196) Bond order in benzene is

    A) 1

    B) 2

    C) 1.5

    D) none of these

    View Answer play_arrow
  • question_answer197) Phenol and benzoic acid may be distinguished by

    A) \[NaHC{{O}_{3}}\]

    B) \[NaOH\]

    C) \[Na\]

    D) \[PC{{l}_{3}}\]

    View Answer play_arrow
  • question_answer198) Correct order of basic nature is

    A) \[N{{H}_{3}}>C{{H}_{3}}N{{H}_{2}}>{{C}_{6}}{{H}_{5}}N{{H}_{2}}\]

    B) \[{{C}_{6}}{{H}_{5}}N{{H}_{2}}>N{{H}_{3}}>C{{H}_{3}}N{{H}_{2}}\]

    C) \[C{{H}_{3}}N{{H}_{2}}>N{{H}_{3}}>{{C}_{6}}{{H}_{5}}N{{H}_{2}}\]

    D) none of the above

    View Answer play_arrow
  • question_answer199) Element having maximum ionization energy

    A) \[Na\]

    B) \[Li\]

    C) \[K\]

    D) \[Rb\]

    View Answer play_arrow
  • question_answer200) \[HCHO\]reacts with \[N{{H}_{3}}\] to give

    A) urotropine

    B) bakelite

    C) terylene

    D) glyptal

    View Answer play_arrow
  • question_answer201) Which of the following is a correct match?

    A) Downs syndrome - 21st chromosome

    B) Sickel cell anaemia- X-chromosome

    C) Haemophilia- Y-chromosome

    D) Parkinson disease - X and Y-chromosome

    View Answer play_arrow
  • question_answer202) Hydrolytic enzymes which act at low pH are called as

    A) proteases

    B) \[\alpha \]-amylases

    C) hydrolases

    D) peroxidase

    View Answer play_arrow
  • question_answer203) Acromegaly is caused by

    A) excess of STH

    B) excess of thyroxine

    C) deficiency of thyroxine

    D) excess of adrenaline

    View Answer play_arrow
  • question_answer204) Gentric drift operates in

    A) small isolated population

    B) large isolated population

    C) fast reproductive population

    D) slow reproductive population

    View Answer play_arrow
  • question_answer205) Mainly which type of hormones control the menstrual cycle in human beings?

    A) FSH

    B) I.H

    C) FSH, LH, Oestrogen

    D) Progesterone

    View Answer play_arrow
  • question_answer206) When both ovaries are removed from rat which hormone is decreased in blood

    A) oxylocin

    B) prolactin

    C) Ostrogen

    D) gonadotrophic releasing factor

    View Answer play_arrow
  • question_answer207) Which cartilage is present on the end of long bones ?

    A) Calcified cartilage

    B) Hyaline cartilage

    C) Elastic cartilage

    D) Fibrous cartilage

    View Answer play_arrow
  • question_answer208) In fluid mosaic model of plasma membrane

    A) upper layer is non-polar and hydrophilic

    B) polar layer is hydrophobic

    C) phospholipids form a bimolecular layer middle part

    D) proteins from a middle layer

    View Answer play_arrow
  • question_answer209) According to fossils discovered upto present time, origin and evolution of man was started from which country?

    A) France

    B) Java

    C) Africa

    D) China

    View Answer play_arrow
  • question_answer210) Which of the following statement is true for lymph?

    A) WBC and serum

    B) All components of blood except RBCs and some proteins

    C) RBCs, WBCs and Plasma

    D) RBCs, Proteins and Platelets

    View Answer play_arrow
  • question_answer211) Impulse of heart beat originates from

    A) SA node

    B) AV node

    C) vagus nerve

    D) cardiac nerve

    View Answer play_arrow
  • question_answer212) Continuous bleeding from an injured part of body is due to deficiency of

    A) Vitamin-A

    B) vitamin-B

    C) vitamin-K

    D) vitamin-E

    View Answer play_arrow
  • question_answer213) Which of the following statement is correct about the node of Ranvier?

    A) Axolemm is discontinuous

    B) Myelin sheath is discontinuous

    C) Both neurilemma and myelin sheath are discontinuous

    D) Covered by myelin sheath

    View Answer play_arrow
  • question_answer214) Number of wild life is continuously decreasing. What is the main reason of this?

    A) Predation

    B) Cutting down of forests

    C) Destruction of habitats

    D) Hunting

    View Answer play_arrow
  • question_answer215) In which era reptiles were dominated?

    A) Coenozoic era

    B) Meszoic era

    C) Palaeozoic era

    D) Archazoic era

    View Answer play_arrow
  • question_answer216) What is true for individual of same species?

    A) Live in same niche

    B) Live in same habitat

    C) Interbreeding

    D) Live in different habitats

    View Answer play_arrow
  • question_answer217) Which of the following is absent in polluted water?

    A) Hydrilla

    B) Water hyacinth

    C) Larva of stone fly

    D) Blue green algae

    View Answer play_arrow
  • question_answer218) In Protozoa like Amoeba and Paramecium an organelle is found for osmoregulation which is

    A) contractile vacuole

    B) mitochondria

    C) nucleus

    D) food vacuole

    View Answer play_arrow
  • question_answer219) During its formation, bread becomes porous due to release of \[C{{O}_{2}}\] by the action of

    A) yeast

    B) bacteria

    C) virus

    D) protoxoans

    View Answer play_arrow
  • question_answer220) Which bacteria are utilized in gober gas plant?

    A) Methanogens

    B) Nitrifying bacteria

    C) Ammonifying bacteria

    D) Denitrifying bacteria

    View Answer play_arrow
  • question_answer221) Which of the following is without exception in angiosperms?

    A) Presence of vessels

    B) Double fertilization

    C) Secondary growth

    D) Autotrophic nutrition

    View Answer play_arrow
  • question_answer222) Cancerous cells can easily be destroyed by radiation due to

    A) rapid cell division

    B) lack of nutrition

    C) fast mutation

    D) lack of oxygen

    View Answer play_arrow
  • question_answer223) Which of the following does not secrete toxins during storage conditions of crop plants?

    A) Aspergillus

    B) Penicillium

    C) Fusarium

    D) Colletotrichum

    View Answer play_arrow
  • question_answer224) Which of the following plant produces seeds but not flowers?

    A) Maize

    B) Mint

    C) Peepal

    D) Pinus

    View Answer play_arrow
  • question_answer225) Best material for the study of mitosis in laboratory is

    A) anther

    B) root tip

    C) leaf tip

    D) ovary

    View Answer play_arrow
  • question_answer226) Mitotic spindle is mainly composed of which proteins?

    A) Actin

    B) Myosin

    C) Actomyosin

    D) Myoglobin

    View Answer play_arrow
  • question_answer227) Which of the following occurs more than one and less than five in a chromosome?

    A) Chromalid

    B) Chromomcre

    C) Cenlromere

    D) Telomere

    View Answer play_arrow
  • question_answer228) Organisms which obtain energy by the oxidation of reduced inorganic compound are called

    A) photoautotrophs

    B) chemoautotrophs

    C) saprozoic

    D) coproheterotrophs

    View Answer play_arrow
  • question_answer229) In angiosperms, all the four microspores of tetrad are covered by a layer which is formed by

    A) pectocellulose

    B) callose

    C) cellulose

    D) sporopollenin

    View Answer play_arrow
  • question_answer230) Which type of association is found in between entomophilous flower and pollinating agent?

    A) Mutualism

    B) Commensalism

    C) Cooperation

    D) Co-evolution

    View Answer play_arrow
  • question_answer231) What is the direction of micropyle in anatropous ovule?

    A) Upward

    B) Downward

    C) Right

    D) Left

    View Answer play_arrow
  • question_answer232) Maximum greenhouse gas is released by which country ?

    A) India

    B) France

    C) USA

    D) Britain

    View Answer play_arrow
  • question_answer233) In angiosperms, pollen tube liberates their male gametes into the

    A) central cell

    B) antipodal cell

    C) egg cell

    D) synergids

    View Answer play_arrow
  • question_answer234) Which of the following absorb light energy for photosynthesis?

    A) Chlorophyll

    B) Water molecule

    C) \[{{O}_{2}}\]

    D) Ku BP

    View Answer play_arrow
  • question_answer235) In photosynthesis energy from light reaction to dark reaction is transferred in the form of

    A) ADP

    B) ATP

    C) RuDP

    D) Chlorophyll

    View Answer play_arrow
  • question_answer236) Opening and closing of stomata is due to

    A) hormonal change in guard cells

    B) change in turgor pressure of guard cells

    C) gaseous exchange

    D) respiration

    View Answer play_arrow
  • question_answer237) Which pigment absorbs the red and far red light?

    A) Cytochrome

    B) Phytochrome

    C) Carotenoids

    D) Chlorophyll

    View Answer play_arrow
  • question_answer238) Seed dormancy is due to the

    A) ethylene

    B) abscisic acid

    C) IAA

    D) starch

    View Answer play_arrow
  • question_answer239) Edible part in mango is

    A) mesocarp

    B) epicarp

    C) endocarp

    D) epidermis

    View Answer play_arrow
  • question_answer240) What is true for cleavage?

    A) Size of embryo increases

    B) Size of cells decreases

    C) Size of cells increases

    D) Size of embryo decreases

    View Answer play_arrow
  • question_answer241) Geocarpic fruit is

    A) potato

    B) peanut

    C) onion

    D) garlic

    View Answer play_arrow
  • question_answer242) In which animal nerve cell is present but brain is absent?

    A) Sponge

    B) Earthworm

    C) Cockroach

    D) Hydra

    View Answer play_arrow
  • question_answer243) In bacteria, plasmid is

    A) extrachromosomal material

    B) main DNA

    C) non-functional DNA

    D) repetitive gene

    View Answer play_arrow
  • question_answer244) Two different species cannot live for long duration in the same niche or habitat. This law is

    A) Aliens law

    B) Mendels law

    C) Causes competitive exclusion principle

    D) Weismanns theory

    View Answer play_arrow
  • question_answer245) A gene is said to be dominant if

    A) it expresses its effect only in homozygous state

    B) it expresses only in heterozygous condition

    C) it expresses in both homozygous and heterozygous conditions

    D) it is never expressed in any condition

    View Answer play_arrow
  • question_answer246) Pleiotropic gene is,

    A) haemophilia

    B) thalasscmia

    C) sickle cell anaemia

    D) colourblindness

    View Answer play_arrow
  • question_answer247) Four radial vascular bundles are found in

    A) dicot root

    B) monocot root

    C) dicot stem

    D) monocot stem

    View Answer play_arrow
  • question_answer248) Vessels are found in

    A) all angiosperms and some gymnosperms

    B) most of the angiosperms and few gymnosperms

    C) all angiosperms, all gymnosperms and some pteridophytes

    D) all pteridophytes

    View Answer play_arrow
  • question_answer249) Jacob and Monod studied lactose metabolism in E. coli and proposed operon concept. Operon concept applicable for

    A) all prokaryotes

    B) all prokaryotes and some cukaryotes

    C) all prokaryotic and all eukaryotic

    D) all prokaryoics and some protozoans

    View Answer play_arrow
  • question_answer250) A diseased man marries a normal woman and they get three daughters and five sons. All the daughters were diseased and sons were normal. The gene of this diseases is

    A) sex-linked dominant

    B) sex-linked recessive

    C) sex-limited character

    D) autosomal dominant

    View Answer play_arrow
  • question_answer251) In a DNA perecame fithymine is 20. What is the percentage of guanine?

    A) 20%

    B) 40%

    C) 30%

    D) 60%

    View Answer play_arrow
  • question_answer252) Which of the following is the example of sex-linked disease?

    A) AIDS

    B) Colorblindness

    C) Syphilis

    D) Gonorrhoea

    View Answer play_arrow
  • question_answer253) Which statements are correct for bacterial transduction?

    A) Transfer of some genes from one bacteria to another bacteria through virus

    B) Transfer of genes from one bacteria to another bacteria by conjugation

    C) Bacteria obtained its DNA directly

    D) Bacteria obtained DNA from other external source

    View Answer play_arrow
  • question_answer254) Transformation experiment was first performed on which bacteria?

    A) E. coli

    B) Diplococcus pneumonia

    C) Salmonella

    D) Pasteurella pestis

    View Answer play_arrow
  • question_answer255) A plant of \[{{F}_{1}}\] generation has genotype AABbCC. On selfing of this plant, the phenorypic ratio in \[{{F}_{2}}\] generation will be

    A) 3 : 1

    B) 1 : 1

    C) 9 : 3 : 3 : 1

    D) 27 : 9 : 9 : 9 : 3 : 3 : 3 : 1

    View Answer play_arrow
  • question_answer256) Axillary bud and terminal bud are derived from the activity of

    A) lateral meristem

    B) intercalary meristem

    C) apical meristem

    D) parenchyma

    View Answer play_arrow
  • question_answer257) Which of the following crops have been brought to India from New world?

    A) Cashewnut, potato, rubber

    B) Mango, tea

    C) Tea, rubber mango

    D) Coffee

    View Answer play_arrow
  • question_answer258) Which of the following enzymes are used to join bits of DNA ?

    A) Ligase

    B) Primase

    C) DNA polymerase

    D) Endonuclease

    View Answer play_arrow
  • question_answer259) Which of the following statement is true?

    A) Vessels are multicellular and with wide lumen

    B) Tracheids are multicellular and with narrow lumen

    C) Vessels are unicellular and with narrow lumen

    D) Tracheids are unicellular and with wide lumen

    View Answer play_arrow
  • question_answer260) Which of the following reunites the exon segments after RNA splicing?

    A) RNA polymerase

    B) RNA primase

    C) RNA ligase

    D) RNA protease

    View Answer play_arrow
  • question_answer261) There are three genes a, b, c, percentage of crossing over between a and b is 20%. b and c is 28% and a and c is 8%. What is the sequence of genes on chromosome?

    A) b, a, c

    B) a, b, c

    C) a, c, b

    D) none of these

    View Answer play_arrow
  • question_answer262) Manipulation of DNA in generic engineering became possible due to the discovery of

    A) restriction endonuclease

    B) DNA ligase

    C) transcriptase

    D) primase

    View Answer play_arrow
  • question_answer263) Convergent evolution is illustrated by

    A) starfish and cuttle fish

    B) dogfish and whale

    C) rat and dog

    D) bacterium and protozoan

    View Answer play_arrow
  • question_answer264) Which one of the following is a matching pair of an animal and a certain phenomenon it exhibits?

    A) Chameleon - Mimicry

    B) Taenia - Polymorphism

    C) Pheretima - Sexual dimorphism

    D) Musca - Complete metamorphosis

    View Answer play_arrow
  • question_answer265) Random genetic drift in a population probably result from

    A) constant low mutation rate

    B) large population size

    C) highly genetically variable individuals

    D) interbreeding within this population

    View Answer play_arrow
  • question_answer266) During prolonged fasting, in what sequence are the following organic compounds used up by the body ?

    A) First carbohydrates, next proteins and lastly lipids

    B) First proteins, next lipids and lastly carbohydrate

    C) First carbohydrate, next fats and lastly proteins

    D) First fats, next carbohydrates and lastly proteins

    View Answer play_arrow
  • question_answer267) The apical meristem of the root is present

    A) only in adventitious roots

    B) in all the roots

    C) only in radicals

    D) only in tap roots

    View Answer play_arrow
  • question_answer268) Diffuse porous woods are characteristic of plant growing in

    A) temperate climate

    B) tropics

    C) alpine region

    D) cold winter regions

    View Answer play_arrow
  • question_answer269) Which one of the following is wrong in relation to photorespiration?

    A) It is a characteristics of \[{{C}_{4}}\] plants

    B) Ii is a characteristics of \[{{C}_{3}}\] plants

    C) It occurs in chloroplasts

    D) It occurs in daytime only

    View Answer play_arrow
  • question_answer270) Stomata of CAM plants

    A) open during the night and close during the day

    B) never open

    C) are always open

    D) open during the day and close at night

    View Answer play_arrow
  • question_answer271) The major portion of the dry weight of plants comprises of

    A) carbon, nitrogen and hydrogen

    B) carbon, hydrogen and oxygen

    C) nitrogen, phosphorus and potassium

    D) calcium, magnesium and sulphur

    View Answer play_arrow
  • question_answer272) In Drosophila, the sex is determined by

    A) the ratio of pairs of X-chromosomes to the pairs of amosomes

    B) whether the egg is fertilized or develops parthenogenetically

    C) the ratio of number of X-chromosomes to the set of autosomes

    D) X and Y-chromosomes

    View Answer play_arrow
  • question_answer273) Christmas disease is another name for

    A) Downs syndrome

    B) sleeping sickness

    C) haemophilia-B

    D) hepatits-B

    View Answer play_arrow
  • question_answer274) When a cluster of genes show linkage behavior they

    A) do not show independent assortment

    B) induce cell division

    C) do not show a chromosome map

    D) show recombination during meiosis

    View Answer play_arrow
  • question_answer275) Degeneration of a genetic code is attributed to the

    A) entire codon

    B) third member of a codon

    C) first member of a codon

    D) second member of a codon

    View Answer play_arrow
  • question_answer276) In a flowering plant, archesporium gives rise to

    A) wall and the tapetum

    B) only tapetum and sporogenous cells

    C) only the wall of the sporangium

    D) both wall and the sporogenous cells

    View Answer play_arrow
  • question_answer277) Which one of the following mineral elements plays an important role in biological nitrogen fixation?

    A) Zinc

    B) Molybdenum

    C) Copper

    D) Manganese

    View Answer play_arrow
  • question_answer278) In sugarcane plant \[^{14}C{{O}_{2}}\] is fixed in a malic acid, in which the enzyme that fixes \[C{{O}_{2}}\] is

    A) ribulose phosphate kinase

    B) fructose phosphatase

    C) ribulose biphosphate carboxylase

    D) phosphoenol pyruvic acid carboxylase

    View Answer play_arrow
  • question_answer279) Which one of the following is categorized under living fossils?

    A) Selaginella

    B) Metasequoia

    C) Pmus

    D) Cyccu

    View Answer play_arrow
  • question_answer280) Boron in green plants assists in

    A) photosynthesis

    B) sugar transport

    C) activation of enzymes

    D) acting as enzyme cofactor

    View Answer play_arrow
  • question_answer281) Chlorenchyma is known to develop in the

    A) spore capsule of a moss

    B) pollen tube of Pinus

    C) cytoplasm of Chlorella

    D) mycelium of a green mould such as Aspergillus

    View Answer play_arrow
  • question_answer282) The aleurone layer in maize grain is specially rich in

    A) lipids

    B) auxins

    C) proteins

    D) starch

    View Answer play_arrow
  • question_answer283) Given below are four matchings of an animal and its kind of respiratory organ (A) silver fish - trachea (B) scorpion - book lung (C) sea squirt - pharyngcal gills (D) dolphin - skin The correct matchings are

    A) B and D

    B) C and D

    C) A and D

    D) A, B and C

    View Answer play_arrow
  • question_answer284) Which of the following discoveries resulted in a Nobel Prize?

    A) Recombination of linked genes

    B) Genetic engineering

    C) X-rays induce sex-linked recessive lethal mutations

    D) Cytoplasmic inheritance

    View Answer play_arrow
  • question_answer285) In which kingdom would you classify the Archaea and nitrogen-fixing organisms. If the five-kingdom system of classification is used

    A) Protista

    B) Monera

    C) Plantae

    D) Fungi

    View Answer play_arrow
  • question_answer286) Which one of the following traits of garden pea studied by Mendel was a recessive feature ?

    A) Green pod colour

    B) Round seed shape

    C) Axial flower position

    D) Green seed colour

    View Answer play_arrow
  • question_answer287) Juicy hair-like structures observed in the lemon fruit develop from

    A) endocarp

    B) both (a) and (b)

    C) exocarp

    D) mesocarp

    View Answer play_arrow
  • question_answer288) Which one of the following describes correctly the homologous structures ?

    A) Organs that have no function now, but had an important function in ancestors

    B) Organs appearing only in embryonic stage and disappearing later in the adult

    C) Organs with anatomical similarities, but performing different functions

    D) Organs with anatomical dissimilarities, but performing same functions

    View Answer play_arrow
  • question_answer289) Darwin in his Natural Selection Theory, did not believe in any role of which one of the following in organic evolution?

    A) Struggle for existence

    B) Discontinuous variations

    C) Parasites and predators as natural enemies

    D) Survival of the fittest

    View Answer play_arrow
  • question_answer290) Escherichia coli is used as an indicator organism to determine pollution of water with

    A) industrial effluents

    B) pollen of aquatic plants

    C) heavy metals

    D) faecal matter

    View Answer play_arrow
  • question_answer291) Which one of the following pairs is not correctly matched?

    A) Vitamin \[{{B}_{12}}\] - Pernicious anaemia

    B) Vitamin \[{{B}_{1}}\] - Beri-beri

    C) Vitamin C - Scurvy

    D) Vitamin \[{{B}_{2}}\] - Pellagra

    View Answer play_arrow
  • question_answer292) Which elements are located at the centre of the porphyrin ring in chlorophyll?

    A) Potassium

    B) Manganese

    C) Calcium

    D) Magnesium

    View Answer play_arrow
  • question_answer293) In the genetic code dictionary, how many codons are used to code for all the 20 essential amino acids?

    A) 61

    B) 60

    C) 20

    D) 64

    View Answer play_arrow
  • question_answer294) Systemic heart refers to

    A) entire heart in lower vertebrates

    B) the two ventricles together in humans

    C) the heart that contracts under stimulation from nervous system

    D) left auricle and left ventricle in higher vertebrates

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  • question_answer295) In which one of the following options the two names refer to one and the same thing?

    A) Citric acid cycle and Calvin cycle

    B) Tricarboxylic acid cycle and urea cycle

    C) Krebs cycle and Calvin cycle

    D) Tricarboxylic acid cycle and citric acid cycle

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  • question_answer296) Test tube baby means a baby born when

    A) the ovum is fertilized externally and thereafter implanted in the uterus

    B) it developes from a non-fertilized egg

    C) it is developed in a test tube

    D) it is developed through tissue culture method

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  • question_answer297) During embryonic development, the establishment of polarity along anterior/posterior, dorsal/ventral or medial/lateral axis is called

    A) anamorphosis

    B) pattern formation

    C) organizer phenomena

    D) axis formation

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  • question_answer298) Two crosses between the same pair of genotypes or phenotypes in which the sources of the gametes are reversed in one cross, is known as

    A) dihybrid cross

    B) reverse cross

    C) test cross

    D) reciprocal cross

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  • question_answer299) Pattern baldness, moustaches and beard in human males arc examples of

    A) sex differentiating traits

    B) sex determining traits

    C) sex linked trails

    D) sex limited traits

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  • question_answer300) Plants reproducing by spores such as mosses and ferns are grouped under the general term

    A) sporophytes

    B) thatlophytes

    C) cryptogams

    D) bryophyles

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