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- 1. Multiple Choice
The value of ‘g’
Increases as we go above the earth’s surface
Decreases as we go to the centre of the earth
Remains constant
Is more at equator and less at poles
- 2. Multiple Choice
Two objects of different masses falling freely near the surface of moon would
have same velocities at any instant
have different accelerations
experience forces of same magnitude
undergo a change in their inertia
- 3. Multiple Choice
Two particles are placed at some distance. If the mass of each of the two particles is tripped, keeping the distance between them unchanged, the value of gravitational force between them will be
1/9 times
9 times
6 times
1/6 times
- 4. Multiple Choice
On the earth, a stone is thrown from a height in a direction parallel to the earth’s surface while another stone is simultaneously dropped from the same height. Which stone would reach the ground first and why?
free fall will reach first
body with horizontal motion reach first
both will reach at same time
never reach ground
- 5. Multiple Choice
Identical packets are dropped from two aeroplanes, one above the equator and the other above the north pole, both at height h. Assuming all conditions are identical, will those packets take same time to reach the surface of earth.
at poles reaches early
at equator reaches early
reaches at equal rate at poles and equator
never reach earth
- 6. Multiple Choice
The masses of two planets are in the ratio 1 : 2. Their radii are in the ratio 1 : 2. The acceleration due to gravity on the planets are in the ratio
1 : 2
2:1
1:4
4:1
- 7. Multiple Choice
A man can jump to a height of 1.5 m on a planet A. What is the height he may be able to jump on another planet whose mass and radius are, double to the planet A
1.5 m
3.0 m
4.5 m
6.0 m
- 8. Multiple Choice
A satellite of the earth is revolving in a circular orbit with a uniform speed v. If the gravitational force suddenly disappears, the satellite will
Continue to move with velocity v along the original orbit
Move with a velocity v, tangentially to the original orbit
Fall down with increasing velocity
Ultimately come to rest somewhere on the original orbit
- 9. Multiple Choice
How does the mass weight of an object vary with respect to mass and radius of the earth. In a hypothetical case, if the diameter of the earth becomes half of its present value and its mass becomes four times of its present value, then how would the weight of any object on the surface of the earth be affected?
m,w
16m,w
m,16w
16m,16w
- 10. Multiple Choice
An object falls through a distance h in certain time on the earth. The same object falls through a distance 4h in the same time on a planet. If 'g' is acceleration due to gravity on the earth, acceleration due to gravity on that planet is
g/4
4 g
g/2
2 g
- 11. Multiple Choice
Acceleration due to gravity on the surface of a planet is g/5 where g is the value on the earth. When a body is vertically thrown up on the earth, it reaches a maximum height h. If the same body is projected with the same velocity from the surface of planet, maximum height reached by it would be
h/5
h/25
5h
25h
- 12. Multiple Choice
If the distance between two bodies is increased by 25%, then the % change in the gravitational force is
Decreases by 36%
Increases by 36%
Increases by 64%
Decreases by 64%
- 13. Multiple Choice
The gravitational force between two bodies is decreased by 36% when the distance between them is increased by 3m. The initial distance between them is
6m
9m
12m
15m
- 14. Multiple Choice
A stone is released from the top of a tower of height 19.6 m. Then its final velocity just before touching the ground will be:
384.16 m/ s
196 m/s
19.6 m/s
3841.4 m/s
- 15. Multiple Choice
Law of gravitation gives the gravitational force between
(a) the earth and a point mass only
(b) the earth and Sun only
(c) any two bodies having some mass
(d) two charged bodies only
- 16. Multiple Choice
The earth attracts a body of mass 1 kg on its surface with a force of
(a) 9.8 N
(b) 19.6 N
(c) 6.67 x 10–11 N
(d) 2 x 6.67 x 10–11 N
- 17. Multiple Choice
The atmosphere is held to the earth by
(a) gravity
(b) wind
(c) clouds
(d) earth’s magnetic field
- 18. Multiple Choice
The SI unit of G
Ncm²/kg²
Nm²kg²
Nm²/kg²
Nkg/m²
- 19. Multiple Choice
The SI unit of weight
kg
N/m²
N
N cm/s²
- 20. Multiple Choice
A ball is thrown up, the value of g will be?
zero
negative
positive
negligible
- 21. Multiple Choice
A ball thrown up vertically return to the earth after 12s . Find the velocity with which it was thrown up?
29.4m/s
58.8 m/s
36.5m/s
48.8m/s
- 22. Multiple Choice
Acceleration due to gravity is the same at every point on the earth’s surface.
true
false
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