Chapter-8: Gravitation

Chapter-8: Gravitation

1. Kepler’s First Law is known as-

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

[su_spoiler title=”answer” style=”fancy” icon=”caret”]Law of orbits[/su_spoiler]

2. Kepler’s second law is known as-

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

[su_spoiler title=”answer” style=”fancy” icon=”caret”]Law of periods[/su_spoiler]

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

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

[su_spoiler title=”answer” style=”fancy” icon=”caret”]Conservation of angular momentum [/su_spoiler]

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

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

[su_spoiler title=”answer” style=”fancy” icon=”caret”]Third Law[/su_spoiler]

5. S. I. unit of “G’ is-

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

[su_spoiler title=”answer” style=”fancy” icon=”caret”]Nm²Kg⁻²[/su_spoiler]

6. Gravitational force depends on-

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

[su_spoiler title=”answer” style=”fancy” icon=”caret”]Mass[/su_spoiler]

7. Dimensional formula of gravitational constant is-

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

[su_spoiler title=”answer” style=”fancy” icon=”caret”][M⁻¹L³T⁻²][/su_spoiler]

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

[su_spoiler title=”answer” style=”fancy” icon=”caret”]9.8 m/s²[/su_spoiler]

9. Value of ‘g’ is-

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

[su_spoiler title=”answer” style=”fancy” icon=”caret”]maximum at poles[/su_spoiler]

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

[su_spoiler title=”answer” style=”fancy” icon=”caret”]decreases[/su_spoiler]

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.

[su_spoiler title=”answer” style=”fancy” icon=”caret”]mass of the body[/su_spoiler]

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

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

[su_spoiler title=”answer” style=”fancy” icon=”caret”]Infinite[/su_spoiler]

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

[su_spoiler title=”answer” style=”fancy” icon=”caret”]Zero[/su_spoiler]