NEET 2013 (Karnataka) | Gravitation Question 31 | Physics

NEET 2013 (Karnataka)

MCQ (Single Correct Answer)

-1

A particle of mass 'm' is kept at rest at a height 3R from the surface of earth, where 'R' is radius of earth and 'M' is mass of earth. The minimum speed with which it should be projected , so that it does not return back, is
(g is acceleration due to gravity on the surface of earth)

$${\left( {{{GM} \over {2R}}} \right)^{1/2}}$$

$${\left( {{{gR} \over 4}} \right)^{1/2}}$$

$${\left( {{{2g} \over R}} \right)^{1/2}}$$

$${\left( {{{GM} \over R}} \right)^{1/2}}$$

NEET 2013 (Karnataka)

MCQ (Single Correct Answer)

-1

The radius of a planet is twice the radius of earth. Both have almost equal average mass densities. V_P and V_E are escape velocities of the planet and the earth, respectively, then

V_P = 1.5 V_E

V_P = 2 V_E

V_E = 3 V_P

V_E = 1.5 V_P

NEET 2013

MCQ (Single Correct Answer)

-1

Infinite number of bodies, each of mass 2 kg are situated on x-axis at distance 1 m, 2 m, 4 m, 8 m, . . . , respectively, from the origin. The resulting gravitational potential due to this system at the origin will be

$$ - {4 \over 3}$$ G

$$-$$ 4G

$$-$$ G

$$ - {8 \over 3}$$ G

NEET 2013

MCQ (Single Correct Answer)

-1

A body of mass 'm' is taken from the earth's surface to the height equal to twice the radius (R) of the earth. The change in potential energy of body will be

3mgR

$${1 \over 3}$$mgR

mg2R

$${2 \over 3}$$ mgR

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