Chapter-8: Gravitation

1. Kepler’s First Law is known as-

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

answer
Law of orbits

2. Kepler’s second law is known as-

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

answer
Law of periods

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

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

answer
Conservation of angular momentum 

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

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

answer
Third Law

5. S. I. unit of “G’ is-

  • Nm⁻²Kg⁻²
  • NmKg⁻²
  • Nm⁻²Kg
  • Nm²Kg⁻²

answer
Nm²Kg⁻²

6. Gravitational force depends on-

  • Electric charge
  • Mass
  • Electric Current
  • None of these

answer
Mass

7. Dimensional formula of gravitational constant is-

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

answer
[M⁻¹L³T⁻²]

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

answer
9.8 m/s²

9. Value of ‘g’ is-

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

answer
maximum at poles

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

answer
decreases

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.

answer
mass of the body

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

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

answer
Infinite

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

answer
Zero

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