Online test of Chapter 10 Gravitation 1| Class 9th Science

Questions :

1. What is the centripetal force that makes moon revolve around earth?
(a) Gravitational Force
(b) Electrostatic Force
(c) Magnetic Force
(d) None

2. The mass of an object is the measure of its
(a) pressure.
(b) weight.
(c) inertia.
(d) thrust.

3. Which of the following case do not take place due to gravitational force?
(a) Earth revolution around Sun
(b) Magnet attracting Iron nails
(c) Apple following from tree
(d) All are due to gravity

4. What is the value of Universal Gravitational Constant on Moon if its value is G on earth?
(a) G
(b) G/6
(c) G/3
(d) G/2

5. Which can be zero at the centre of the earth?

(a) Mass only
(b) Weight only
(c) Both mass and weight
(d) None of the above

6. Find the gravitational force between two spheres of mass m and m/2 having radius x are in contact with each other.

(a)

(b)

(c)

(d)

7. What is the unit of universal gravitational Constant?

(a) Newton (meter)²(kilogram)^-2
(b) Newton (meter)^-2(kilogram)^-1
(c) Newton (meter)²(kilogram)²
(d) Newton (meter)²(kilogram)^-1

8. Which of the following can be said about the motion of a ball just after it is thrown upward?8. Which of the following can be said about the motion of a ball just after it is thrown upward?
(a) Accelerated
(b) Retarded
(c) Constant speed
(d) Constant velocity

9. Which of the following graph represents the motion of a ball when thrown upward?

(a) (i)
(b) (ii)
(c) (iii)
(d) (iv)

10. The acceleration due to gravity varies on earth with
(a) Distance from equator
(b) Altitude
(c) Mass of an object
(d) (a) and (b)