Gravitation-Class 9 NCERT

The Gravitational force - In the universe all the objects attract each other. The attraction force between the objects is called the gravitational force.

Gravitation - Class 9

1. Who proposed the Law of Universal Gravitation?

a) Isaac Newton
b) Albert Einstein
c) Galileo Galilei
d) Johannes Kepler

2. The force of attraction between two objects is directly proportional to their:

a) Product of Masses
b) Distance
c) Volume
d) Surface area

3. The unit of gravitational force is:

a) Newton (N)
b) Joule (J)
c) Meter (m)
d) Kilogram (kg)

4. What is the value of the gravitational constant (G)?

a) 9.8 N/kg
b) 6.67 x 10^-11 N m²/kg²
c) 10 N/m²
d) 5.6 x 10^-10 N m²/kg²

5. Which planet has the strongest gravitational force?

a) Earth
b) Jupiter
c) Mars
d) Venus

6. The acceleration due to gravity on Earth is:

a) 10 m/s²
b) 9.8 m/s²
c) 11 m/s²
d) 9.5 m/s²

7. What happens to the gravitational force between two objects when the distance between them is doubled?

a) It becomes four times weaker
b) It becomes twice as strong
c) It becomes half as strong
d) It becomes four times stronger

8. Which of the following does not affect the force of gravity between two objects?

a) Mass of the objects
b) Distance between the objects
c) The color of the objects
d) Size of the objects

9. Gravitational force is:

a) Attractive
b) Repulsive
c) Both attractive and repulsive
d) Neither attractive nor repulsive

10. The force of gravity between two objects is inversely proportional to:

a) The product of their masses
b) The square of the distance between them
c) The sum of their masses
d) The square of their masses