Gravitation (Google form)

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By Kalpana Verma (KV NAL Campus)

Name of the Student *

Name of School *

1. Two objects of different masses falling freely near the surface of the moon would *

1 point

experience forces of same magnitude

have different acceleration

have same velocities at any instant

undergo a change in their inertia

2. The value of acceleration due to gravity *

1 point

is same on equator and poles

is least on poles

is least on equator

increases from pole to equator

3. When a plastic toy is put into the water it starts floating on the surface of water due to the upward buoyant force from water. If the toy is pushed more inside the water by applying the force than the buoyant force *

1 point

Will increase as the toy is immersed into the water

Will decrease as the toy is immersed into the water

Will first increase and then decrease as the toy is immersed more into the water

Will remain the same as long as the toy is inside the water

4. A student is whirling a stone tied with a string in a horizontal circular path as shown in the following figure. If the string breaks the stone: *

1 point

Will continue to move in the circular path

Will move along a straight line the tangential to the circular path

Will move along a straight line towards the centre of the circular path

Will move along a straight line perpendicular to the circular path away from the boy

5. An object weighs 20 N in air. When immersed fully in water, it weighs only 12 N. The weight of the liquid displaced by the object will be *

1 point

12 N

20 N

10 N

8 N

6. An apple falls from a tree because of gravitational attraction between the Earth and the apple. If F1 is the magnitude of force exerted by the Earth on the apple and F2 is the magnitude of force exerted by the apple on the Earth, then *

1 point

F1 is only a little greater than F2

F2 is very much greater than F1

F1 is very much greater than F2

F1 and F2 are equal

7. If the radius of the earth were to shrink by 1% its mass remaining the same, the acceleration due to gravity on the earth’s surface would *

1 point

decrease by 2%

will increase by 9.8%

increase by 2%

remain unchanged

8. Two astronauts are floating in gravitational free space after having lost contact with their spaceship. The two will *

1 point

keep floating at the same distance between them

move away from each other

will become stationary

move towards each other

9. The value of ‘g’ at a particular point is 9.8 m/sec2 suppose the earth suddenly shrink uniformly to half its present size without losing any mass. The value of ‘g’ at the same point (assuming that the distance of the point from the centre of the earth does not shrink) will become *

1 point

19.6 m/sec2

4.9 m/sec2

2.45 m/sec2

9.8 m/sec2

10. A boy stands on a box having 160 cm length, 80 cm breadth and 30 cm width in three ways. In which of the following cases, pressure exerted by the brick will be *

1 point

(d) the same in all the above three cases

(b) maximum when breadth and width form the base

maximum when length and breadth form the base

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