**NEET NTA, JEE MAIN - Physics Preparation**

*Gravitation*
Physics
solved MCQ test series and practice questions with answers from the chapter
“Gravitation”. Prepare at home (Ghar Baithe Taiyari Kare) for NTA NEET, JEE
Main, all national and state level engineering and medical entrance exams.

__Gravitation__**(Topics / Syllabus)**

Kepler’s laws of planetary
motion. Laws of Gravitation - the universal law of gravitation. Acceleration
due to gravity and its variation with altitude and depth. Gravitational Forces.
Gravitational
potential energy and Field; Escape velocity, orbital velocity of a satellite.
Geostationary satellites. Motion of planets
and satellites in circular orbits.

__Physics Practice Questions: Gravitation__

*India Study Solution MCQ Test Series – Set 3 (Q. No. 21 - 30)*
Question
21: If the change in the value of g at a height h above the surface of earth is
the same as at a depth d below it (both h and d are much smaller than the
radius of the earth), then:

a.
d = h b. d = 2h c. d = h/2
d. d = h

^{2}
Question
22: The weight of a body will appear to be zero when

a.
It is kept at the centre of the earth

b.
It is freely falling

c.
It is inside the satellites orbiting around the earth

d.
All of these

Question
23: A satellite launching station should be

a.
Near the equator region

b.
Near the polar region

c.
On the polar axis

d.
On any place

Question
24: For the moon to cease to remain the earth’s satellite, its orbital velocity
has to increase by a factor –

a.
2 b. √2 c. 1/√2
d. √3

Question
25: What will be the formula of mass of the earth in terms of g, R and G?

Question
26: Gravitational force between a point mass m and M separated by a distance is
F. Now, if a point mass 2m is placed next to m in contact with it, the force on
M due to m and the total force on M are:

a.
2F, F b. F, 2F c. F, 3F
d. F, F

Question
27: The distances of Neptune and Saturn from the sun are nearly 10

^{13}and 10^{12}meters respectively. Assuming that they move in circular orbits, their periodic times will be in the ratio –
a.
√10 b. 100 c. 10√10
d. 1/√10

Question
28: Which of the following graphs shows the variation of acceleration due to
gravity g with depth h from the surface of the earth?

(1)
(a) (2) (b) (3) (c)
(4) (d)

Question
29: A satellite is revolving around the earth in a circular orbit with a
uniform speed. If the gravitational force suddenly disappears, then the
satellite will

a.
Continue to move in the same orbit with that speed

b.
Move tangentially to the orbit with that speed

c.
Move away from the earth normally to the orbit

d.
Fall down on the earth

Question
30: A satellite can be in a geostationary orbit around a planet at a distance r
from the centre of the planet. If the angular velocity of the planet about its
axis doubles, a satellite can now be in a geostationary orbit around the planet
if its distance from the centre of the planet is –

*Gravitation*

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