NEET 2017 APRA

Instructions

For the following questions answer them individually

NEET 2017 APRA - Question 21


The bulk modulus of a spherical object is ‘B’. If it is subjected to uniform pressure ‘p’, the fractional decrease in radius is

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NEET 2017 APRA - Question 22


The acceleration due to gravity at a height 1 km above the earth is the same as at a depth d below the surface of earth. Then

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NEET 2017 APRA - Question 23


The diagrams below show regions of equipotentials.


A positive charge is moved from A to B in each diagram.

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NEET 2017 APRA - Question 24


Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time $$t_1.$$ On other days, if she remains stationary on the moving escalator, then the escalator takes her up in time $$t_2.$$ The time taken by her to walk up on the moving escalator will be

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NEET 2017 APRA - Question 25


Two blocks A and B of masses 3m and m respectively are connected by a massless and inextensible string. The whole system is suspended by a massless spring as shown in figure. The magnitudes of acceleration of A and B immediately after the string is cut, are respectively

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NEET 2017 APRA - Question 26


A spherical black body with a radius of 12 cm radiates 450 watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watt would be

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NEET 2017 APRA - Question 27


Two rods A and B of different materials are welded together as shown in figure. Their thermal conductivities are $$K_1 and K_2.$$ The thermal conductivity of the composite rod will be

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NEET 2017 APRA - Question 28


One end of string of length l is connected to a particle of mass ‘m’ and the other end is connected to a small peg on a smooth horizontal table. If the particle moves in circle with speed ‘v’, the net force on the particle (directed towards center) will be (T represents the tension in the string)

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NEET 2017 APRA - Question 29


In a common emitter transistor amplifier the audio signal voltage across the collector is 3 V. The resistance of collector is $$3 kΩ$$. If current gain is 100 and the base resistance is $$2 kΩ$$, the voltage and power gain of the amplifier is

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NEET 2017 APRA - Question 30


Which of the following statements are correct?
(a) Centre of mass of a body always coincides with the centre of gravity of the body.
(b) Centre of mass of a body is the point at which the total gravitational torque on the body is zero
(c) A couple on a body produce both translational and rotational motion in a body.  
(d) Mechanical advantage greater than one means that small effort can be used to lift a large load.

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