Chapter-8: Gravitation |

1. Kepler’s First Law is known as-

- Law of orbits
- Law of areas
- Law of periods
- None of these.

2. Kepler’s second law is known as-

- Law of orbits
- Law of periods
- Law of areas
- None of these.

3. Kepler’s Second Law is a consequence of-

- Conservation of energy
- Conservation of linear momentum
- Conservation of angular momentum
- Conservation of mass.

4. Which of the following Kepler’s Law is known as Harmonic Law?

- Second Law
- First Law
- Third Law
- None of these.

5. S. I. unit of “G’ is-

- Nm⁻²Kg⁻²
- NmKg⁻²
- Nm⁻²Kg
- Nm²Kg⁻²

6. Gravitational force depends on-

- Electric charge
- Mass
- Electric Current
- None of these

7. Dimensional formula of gravitational constant is-

- [M⁻¹L³T⁻²]
- [M³L³T⁻³]
- [M³L³T³]
- [LT⁻³]

8. The value of acceleration due to the gravity of the earth –

- 98 m/s²
- 0.98 m/s²
- 9.8 m/s²
- 0.098 m/s²

9. Value of ‘g’ is-

- maximum at poles
- maximum at the equator
- same everywhere
- maximum at the center of the earth.

10. If we go down from the earth’s surface, the value of acceleration due to gravity (g)-

- decreases
- remains constant
- increases
- None of these

11. The escape velocity does not depend upon-

- mass of the body
- height of the location from where it is projected
- the density of the body
- None of these.

12. The time period of a simple pendulum in a satellite is-

- Same on the earth
- Zero
- Infinite
- None of these

13. The weight of a body at the center of the earth is-

- Zero
- Infinite
- Same as on the surface of the earth
- None of these