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CBSE

Subject

Physics

NEET Physics : Gravitation

Multiple Choice Questions

71.

Height of geostationary satellite is

16000 km
22000 km
28000 km
36000 km

72.

A wire of length l and mass m is bent in the form of a semicircle. The gravitational field intensity at the centre of semicircle is

$\frac{G m}{π l}$ along x - axis
$\frac{G m}{π l}$ along y-axis
$\frac{2 π G m}{l^{2}}$ along y-axis
$\frac{2 π G m}{l^{2}}$ along x-axis

73.

Assertion: Total energy is conserved in moving a satellite to higher orbit.

Reason: Sum of change in PE and KE is same in magnitude and opposite in nature.

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

74.

Assertion: An astronaut experience weightlessness in a space satellite.

Reason: When a body falls freely it does not experience gravity.

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

75.

Assertion: The difference in the value of acceleration due to gravity at pole and equator is proportional to square of angular velocity of earth.

Reason: The value of acceleration due to gravity is minimum at the equator and maximum at the pole.

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

76.

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
$\frac{1}{3} mgR$
2 mgR
$\frac{2}{3} mgR$

77.

Assertion: A man in a closed cabin which is falling freely does not experience gravity.

Reason: Inertial and gravitational mass have equivalence.

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

78.

Suppose the gravitational force varies inversely as the n^th power of distance. Then the time period of a planet in circular orbit of radius R around the sun will be proportional to

$R^{(\frac{n + 1}{2})}$
$R^{(\frac{n - 1}{2})}$
Rⁿ
$R^{(\frac{n - 2}{2})}$

79.

Gravitational potential of the body of mass m at a height h from surface of earth of radius R is (Take g = acceleration due to gravity at earth's surface)

- g(R + h )
- g ( R + h )
g ( R + H )
g ( R - h )

80.

Find out the correct relation for the dependance of change in acceleration due to gravity on the angle at the latitude, due to rotation of earth

dg ∝ cos $ϕ$
dg ∝ cos² $ϕ$
dg ∝ cos^3/2 $ϕ$
dg ∝ $\frac{1}{cosϕ}$

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