NEET PHYSICS QUIZ 3 AUGUST 11

Physics Test 23 – Gravitation

10 Theory-Based MCQs

Instructions: Answer all 10 questions and click Submit Test. Correct answers will be revealed only after submission.

Note: These questions are theory/concept based; numerical calculation questions have been excluded.

1. According to Newton's law of gravitation, the gravitational force between two bodies is proportional to:

A) The square of the distance between them B) The inverse square of the distance between them C) The distance between them D) The inverse of the distance between them

Correct Answer: B) The inverse square of the distance between them

2. Which statement correctly describes the gravitational forces between the Earth and the Moon?

A) Earth's force on the Moon is greater B) Moon's force on Earth is greater C) The two gravitational forces are equal in magnitude and opposite in direction D) There is no gravitational force between them

Correct Answer: C) The two gravitational forces are equal in magnitude and opposite in direction

3. Why does a geostationary satellite appear fixed with respect to the Earth?

A) It does not move around the Earth B) Its orbital period is the same as the Earth's rotation period C) It has no gravitational force acting on it D) It moves from pole to pole

Correct Answer: B) Its orbital period is the same as the Earth's rotation period

4. Which statement about escape velocity is correct?

A) It depends on the mass of the escaping body B) It depends on the direction in which the body is projected C) It is independent of the mass of the escaping body D) It is always zero at the Earth's surface

Correct Answer: C) It is independent of the mass of the escaping body

5. For a satellite moving in an elliptical orbit around the Earth, which statement is correct?

A) Its total mechanical energy continuously increases B) Its acceleration is always directed towards the centre of the Earth C) Its angular momentum continuously changes in magnitude D) Its speed is always constant

Correct Answer: B) Its acceleration is always directed towards the centre of the Earth

6. What happens to the acceleration due to gravity as altitude above the Earth's surface increases?

A) It increases B) It decreases C) It remains exactly constant D) It first becomes zero and then increases

Correct Answer: B) It decreases

7. What happens to the acceleration due to gravity as depth below the Earth's surface increases?

A) It increases continuously B) It decreases C) It remains unchanged at all depths D) It becomes independent of depth

Correct Answer: B) It decreases

8. According to Kepler's third law, the square of the orbital period of a planet is proportional to:

A) Its orbital radius B) The square of its orbital radius C) The cube of its orbital radius D) The inverse of its orbital radius

Correct Answer: C) The cube of its orbital radius

9. Why is the motion of a particle under a central force confined to a plane?

A) Its mass becomes constant B) Its angular momentum is conserved C) Its speed becomes zero D) The force becomes zero

Correct Answer: B) Its angular momentum is conserved

10. Which statement about a polar satellite is correct?

A) It is necessarily a high-altitude satellite B) It moves around the Earth in an east-west equatorial orbit C) It can be used for studying the topography of planets D) It remains fixed over one point on Earth

Correct Answer: C) It can be used for studying the topography of planets