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NEET Physics : Gravitation

Multiple Choice Questions

91.

In an earth's satellite, the astronaut stands on a platform. His weight as indicated by the balance will be

6g
2g
8g
zero

92.

Escape velocity from a planet is v, If its mass is increased to 8 times and its radius is increased to 2 times, then the new escape velocity would be :

v_e
$\sqrt{2}$ v_e
2v_e
$2 \sqrt{2}$ v_e

93.

Assertion: At pole value of acceleration due to gravity (g) is greater than that of equator.

Reason: Earth rotates on its axis in addition to revolving round the sun.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true and reason is not the correct expalnation of assertion.
If assertion is true but reason is false.
If assertion is false and reason is true.

94.

Assertion: The time period of revolution of a satellite around a planet is directly proportional to the radius of the orbit of the satellite.

Reason: Artificial satellite do not follow Kepler's laws of planatary motion.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion is true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If assertion is false but reason is true.

95.

A body weighs 200 N at the surface of earth. If it be placed in an artificial satellite revolving at height where acceleration due to gravity is half of that at earth's surface. It will weigh

100N
200N
400N
Zero

96.

A satellite in a circular orbit of radius R has a period of 4 h. Another satellite with orbital radius 3 R around the same planet will have a period (in hours)

16
4
4√27
4√8

97.

The acceleration due to gravity becomes g/2, (g = acceleration due to gravity on the surface of the earth) at a height equal to

98.

In planetary motion, the areal velocity of position vector of a planet depends on angular velocity ( $ω$ ) and distance of the planet from the sun (r). If so the correct relation for areal velocity is

$\frac{dA}{dt} \propto ωr$
$\frac{dA}{dt} \propto ω^{2} r$
$\frac{dA}{dt} \propto {ωr}^{2}$
$\frac{dA}{dt} \propto \sqrt{ωr}$

99.

An artificial satellite revolves around the earth in a circular orbit with a speed v. If m is the mass of the satellite, its total energy is

$\frac{1}{2}$ mv²
$\frac{- 1}{2}$ mv²
-mv²
$\frac{3}{2}$ mv²

100.

A body of mass m is moved to a height h equal to the radius of the earth. The increase in potential energy is

2mgR
mgR
$\frac{1}{2} mgR$
$\frac{1}{4} mgR$

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NEET Physics : Gravitation

Multiple Choice Questions