**Q.1. Newton’s universal law of gravitation applies to**

(a) small bodies only

(b) planets only

(c) both small and big bodies

(d) only valid for solar system

## Answer

(c) It is applicable to both small & big bodies.**Q.2. The value of G varies with**

(a) height above the earth’s surface

(b) depth below the ground

(c) radius of the planet

(d) None of these

## Answer

(d) G is a universal gravitational constant as the value of G is same for all pairs of bodies situated anywhere in the universe.**Q.3. Force of gravitational attraction is least**

(a) at the equator

(b) at the poles

(c) at a point in between equator and any pole

(d) None of these

## Answer

(a) The radius of earth is maximum at equator, therefore, gravitational force of attraction is least at equator.**Q.4. The ratio of the inertial mass to gravitational mass is equal to**

(a) 0.5

(b) 1

(c) 2

(d) no fixed number

## Answer

(c) The inertial mass & gravitational mass are equivalent & ratio of inertial mass to gravitational mass = 1 to a high degree of accuracy (experimental finding).**Q.5. Who among the following gave first the experimental value of G**

(a) Cavendish

(b) Copernicus

(c) Brok Taylor

(d) None of these

## Answer

(a)**Q.6. Two spheres of masses m and M are situated in air and the gravitational force between them is F. The space around the masses is now filled with a liquid of specific gravity 3. The gravitational force will now be**

(a) 3 F

(b) F

(c) F/3

(d) F/9

## Answer

(b) It will remain the same as the gravitational force is independent of the medium separating the masses.**Q.7. Consider Earth to be a homogeneous sphere. Scientist A goes deep down in a mine and scientist B goes high up in a balloon. The gravitational field measured by**

(a) A goes on decreasing and that by B goes on increasing

(b) B goes on decreasing and that by A goes on increasing

(c) each decreases at the same rate

(d) each decreases at different rates

## Answer

(d) Both decreases but variation are different.**Q.8. In some region, the gravitational field is zero. The gravitational potential in this region.**

(a) must be variable

(b) must be constant

(c) cannot be zero

(d) must be zero

## Answer

(b)**Q.9. In a gravitational field, at a point where the gravitational potential is zero**

(a) the gravitational field is necessarily zero

(b) the gravitational field is not necessarily zero

(c) any value between one and infinite

(d) None of these

## Answer

(a)**Q.10. Intensity of the gravitational field inside the hollow spherical shell is**

(a) variable

(b) minimum

(c) maximum

(d) zero

## Answer

(d) At a point inside a spherical shell, the value of gravitational intensity, I = 0.If V = 0 then gravitational field is necessarily zero.

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