Gravitation – Objective Questions
Page 5 • High-Confidence Scorers & Last-Minute Traps
Question 28
The ratio of escape velocity to orbital velocity of a satellite at the same radius is:
A) 1 B) √2 C) 2 D) 1/√2
Correct Answer: B) √2
Explanation:
v = √(GM/r), ve = √(2GM/r) ⇒ ve/v = √2
Question 29
A body is projected vertically upward with speed equal to escape velocity. Its speed at infinity will be:
A) zero B) same as projection speed C) half D) depends on mass
Correct Answer: A) zero
Explanation:
Escape velocity is defined as the minimum speed required to just reach infinity with zero speed.
Question 30
Which graph best represents variation of g with height above Earth?
A) Linear decrease B) Exponential decrease C) Inverse square curve D) Constant
Correct Answer: C) Inverse square curve
Explanation:
g ∝ 1/(R + h)², so the curve follows inverse square nature.
Question 31
The gravitational force between two bodies becomes zero when:
A) one mass becomes zero B) distance becomes zero C) distance becomes infinite D) masses are equal
Correct Answer: C) distance becomes infinite
Explanation:
Since F ∝ 1/r², as r → ∞, F → 0.
Question 32
If a satellite moves from lower orbit to higher orbit, its speed:
A) increases B) decreases C) remains same D) becomes zero
Correct Answer: B) decreases
Explanation:
Orbital speed v = √(GM/r). As r increases, v decreases.
Question 33
At which location is acceleration due to gravity maximum?
A) At poles B) At equator C) At centre of Earth D) At high altitude
Correct Answer: A) At poles
Explanation:
Centrifugal force is zero at poles and Earth’s radius is minimum there, so g is maximum.
Question 34
Which of the following is conserved when a satellite revolves around Earth?
A) Linear momentum B) Angular momentum C) Mechanical energy D) Speed
Correct Answer: B) Angular momentum
Explanation:
Gravitational force is central force, so torque is zero and angular momentum is conserved.
Last-Minute Revision Tricks
- Always measure distance from Earth’s centre
- Use proportionality before plugging values
- Escape velocity → think energy
- Satellite problems → think centripetal force
- Mass never changes; weight always can
One-Line Exam Mantra
If you know how g, v, T vary with R, you can solve 90% gravitation MCQs in seconds.
Objective Questions • Page 5 Completed Successfully ✅
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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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