Gravitation – Objective Questions
Page 2 • Previous Questions with Logic & Traps
Question 8
If the distance between two masses is increased by 3 times, the gravitational force becomes:
A) 3 times B) 1/3 times C) 1/9 times D) 1/27 times
Correct Answer: C) 1/9 times
Explanation:
Gravitational force F ∝ 1/r². If r → 3r, then F → 1/(3²) = 1/9.
Question 9
A body is taken to a height equal to the radius of Earth. Its weight becomes:
A) W B) W/2 C) W/4 D) W/8
Correct Answer: C) W/4
Explanation:
At height h = R, distance from Earth’s centre = 2R. g ∝ 1/(2R)² = 1/4 → Weight = W/4.
Question 10
Which of the following quantities remains constant when a body moves from Earth to Moon?
A) Weight B) Acceleration due to gravity C) Mass D) Escape velocity
Correct Answer: C) Mass
Explanation:
Mass is independent of gravitational field. Weight, g, and escape velocity change with planet.
Question 11
At what point between Earth and Moon is the net gravitational force on a body zero?
A) Midpoint B) Near Earth C) Near Moon D) At Earth’s surface
Correct Answer: C) Near Moon
Explanation:
Earth has much greater mass than Moon, so the balance point shifts closer to the Moon.
Question 12
If mass of Earth is doubled keeping radius same, acceleration due to gravity becomes:
A) half B) double C) four times D) unchanged
Correct Answer: B) double
Explanation:
g = GM/R². If M → 2M, then g → 2g.
Question 13
A satellite moving in circular orbit has:
A) zero acceleration B) tangential acceleration only C) centripetal acceleration only D) both centripetal and tangential acceleration
Correct Answer: C) centripetal acceleration only
Explanation:
In uniform circular motion, speed is constant but direction changes, so only centripetal acceleration exists.
Question 14
The value of g decreases with height because:
A) mass of Earth decreases B) Earth’s radius increases C) distance from Earth’s centre increases D) air resistance increases
Correct Answer: C) distance from Earth’s centre increases
Explanation:
g ∝ 1/r². As distance from centre increases, g decreases.
Important Objective Tip
In gravitation problems, always visualize the distance from centre, not height from surface.
Objective Questions • Page 2 Completed ✅
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- Gravitation – Part 1
- Gravitation – Part 2
- Gravitation – Part 3
- Gravitation – Part 4
- Gravitation – Part 5
- Gravitation – Part 6
- Gravitation – Part 7
- Gravitation – Part 8
- Gravitation – Part 9
- Gravitation – Part 10
- Gravitation – Part 11
- Gravitation – Part 12
- Gravitation – Part 13
- Gravitation – Part 14
- Gravitation – Part 15
- Gravitation – Part 16
- Gravitation – Part 17
- Gravitation – Part 18
- Gravitation – Part 19
- Gravitation – Part 20
- Gravitation – Part 21
- Gravitation – Part 22
- Gravitation – Part 23
- Gravitation – Part 24
- Gravitation – Part 25
- Gravitation – Part 26
- Gravitation – Part 27
- Gravitation – Part 28
- Gravitation – Part 29
- Gravitation – Part 30
- Gravitation – Part 31
- Gravitation – Part 32
- Gravitation – Part 34
- Gravitation – Part 35
- Gravitation – Part 36
- Gravitation – Part 37
- Gravitation – Part 38
- Gravitation – Part 39
- Gravitation – Part 40
- Gravitation – Part 41
- Gravitation – Part 42
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