📅 Published on: 03.12.2025
Preparing well for exams becomes much easier when students practice class 9 science gravitation important MCQ, as these questions help strengthen core concepts of gravitational force, mass, weight, free fall, and universal law of gravitation. MCQs allow students to quickly revise formulas and understand real-life applications of gravity through conceptual questions. Solving repeated patterns of questions boosts confidence, improves speed, and ensures better performance in school exams as well as olympiads. Therefore, practicing Gravitation Class 9 Important mcq sets is one of the best ways to master this chapter effectively.
A. OBJECTIVE TYPE QUESTIONS (Based on NCERT Book)I. Multiple Choice Questions
1. What is gravitation?
It is the phenomenon of attraction between
- (a) sun and earth
- (b) sun and moon
- (c) earth and moon
- (d) any two bodies in the universe
Correct option: (d) any two bodies in the universe
2. What is gravity?
It is the phenomenon of attraction between
- (a) earth and sun
- (b) earth and moon
- (c) earth and moon
- (d) earth and any other body
Correct option: (d) earth and any other body
3. How will you calculate mass of earth?
- (a) G = 8M / R²
- (b) g = GM / R⁴
- (c) g = GMR / R²
- (d) g = GM / R²
Correct option: (d) g = GM / R²
4. What is the standard value of ‘g’ on the surface of earth?
- (a) g = 9.8 m/s²
- (b) g = 8.9 m/s²
- (c) g = 9.8 cm/s²
- (d) g = 10.3 m/s²
Correct option: (a) g = 9.8 m/s²
5. The value of universal gravitational constant is
- (a) G = 6.67 × 10⁸ N·m²·kg⁻²
- (b) G = 6.67 × 10⁻⁸ N·m²·kg⁻²
- (c) G = 6.67 × 10¹¹ N·m²·kg⁻²
- (d) G = 6.67 × 10⁻¹¹ N·m²·kg⁻²
Correct option: (d) G = 6.67 × 10⁻¹¹ N·m²·kg⁻²
6. Which force is responsible for holding the solar system together?
- (a) gravitational pull of sun on the planets
- (b) gravitational pull between the planets
- (c) electromagnetic force between the planets
- (d) nuclear force between the planets
Correct option: (a) gravitational pull of sun on the planets
7. Choose the correct statement
- (a) Value of ‘g’ is same on the surface of moon and surface of earth
- (b) Value of G is same on the surface of earth and surface of moon
- (c) Both (a) and (b)
- (d) Neither (a) nor (b)
Correct option: (b) Value of G is same on the surface of earth and surface of moon
8. A body is thrown vertically upwards with some velocity. Choose the correct statement:
- (a) At the highest point, its upward velocity becomes zero
- (b) At the highest point, its upward acceleration = 0
- (c) At the highest point, its downward acceleration = 0
- (d) None of the above
Correct option: (a) At the highest point, its upward velocity becomes zero
9. The areal velocity of a planet around the sun is constant. Which law is this?
- (a) Kepler’s second law of planetary motion
- (b) Kepler’s first law of planetary motion
- (c) Both (a) and (b)
- (d) Neither (a) nor (b)
Correct option: (a) Kepler’s second law of planetary motion
10. A body is just dropped from a certain height.
- (a) its initial velocity is zero
- (b) its final velocity is zero
- (c) its acceleration is zero
- (d) none of the above
Correct option: (a) its initial velocity is zero
11. A body weighs 1 kg on moon. How much will it weigh on earth where gravitational force is 6 times that on moon?
- (a) 6 kg
- (b) 1/6 kg
- (c) 36 kg
- (d) 1/36 kg
Correct option: (a) 6 kg
12. In the above question, mass of the body on earth will be
- (a) 6 kg
- (b) 3 kg
- (c) 1 kg
- (d) cannot say
Correct option: (c) 1 kg
13. Out of G and g, whose value is different on the surface of moon and surface of earth?
- (a) G
- (b) g
Correct option: (b) g
14. A body weighs 10 kg on earth. If gravitational force on moon is 1/6 of that on earth, what will be mass of the body on moon?
- (a) 10 kg
- (b) 6 kg
- (c) 10/6 kg
- (d) 10/6 kg
Correct option: (a) 10 kg
15. A ball is thrown vertically upwards with a velocity of 98 m/s. The time in which it will return to earth is (Take g = 9.8 m/s²)
- (a) 10 s
- (b) 5 s
- (c) 20 s
- (d) 40 s
Correct option: (c) 20 s
class 9 science ch 10 question answer
Important MCQs – Gravitation Class 9
16. What is represented by G ?
- (a) Acceleration due to gravity
- (b) Universal gravitational constant
- (c) Both (a) & (b)
- (d) Neither (a) nor (b)
Correct option: (b) Universal gravitational constant
17. What is represented by g ?
- (a) Universal gravitational constant
- (b) Acceleration due to gravity
- (c) Both (a) & (b)
- (d) Neither (a) nor (b)
Correct option: (b) Acceleration due to gravity
18. The correct relation between g and G is
- (a) g = GM / R²
- (b) G = 8M / R²
- (c) g = G
- (d) g = GM / R³
Correct option: (a) g = GM / R²
19. What is the standard value of G ?
- (a) 6.67 × 10⁻¹¹ Nm²kg⁻²
- (b) 6.67 × 10⁻⁸ Nm²kg⁻²
- (c) 7.76 × 10¹⁰ Nm²kg⁻²
- (d) None of these
Correct option: (a) 6.67 × 10⁻¹¹ Nm²kg⁻²
20. What is the standard value of g on the surface of earth ?
- (a) 9.8 m/s²
- (b) 10.8 m/s²
- (c) 6.7 m/s²
- (d) None of the above
Correct option: (a) 9.8 m/s²
21. Which force is responsible for holding the solar system together ?
- (a) Gravitational pull between planets
- (b) Gravitational pull of sun on the planets
- (c) Nuclear force between planets
- (d) Electromagnetic force between planets
Correct option: (b) Gravitational pull of sun on the planets
22. Which force is responsible for tides in the ocean at night ?
- (a) Gravitational pull of sun
- (b) Gravitational pull of moon
- (c) Gravitational pull of earth
- (d) None of these
Correct option: (b) Gravitational pull of moon
23. Out of G and g, whose value is same on the surface of moon and earth ?
- (a) G
- (b) g
- (c) Cannot say
Correct option: (a) G
24. The areal velocity of a planet around the sun is constant. Which law is this?
- (a) Kepler’s first law
- (b) Kepler’s second law
- (c) Both (a) and (b)
- (d) Neither (a) nor (b)
Correct option: (b) Kepler’s second law
25. A body is just dropped from a height. Its initial velocity (u) is
- (a) zero
- (b) positive
- (c) negative
- (d) cannot say
Correct option: (a) zero
26. A ball is thrown vertically upwards with a velocity of 98 m/s. The maximum height reached is
- (a) 490 m
- (b) 245 m
- (c) 122.5 m
- (d) 980 m
Correct option: (b) 245 m
27. In the above question, total time taken to return to earth is
- (a) 10 s
- (b) 20 s
- (c) 15 s
- (d) 40 s
Correct option: (b) 20 s
28. What is the value of acceleration of free fall?
- (a) 5 m/s²
- (b) 10 m/s²
- (c) 9.8 m/s²
- (d) 8.4 m/s²
Correct option: (c) 9.8 m/s²
29. If the distance between two objects is halved, gravitational force becomes
- (a) 4F
- (b) F/2
- (c) 2F
- (d) F/4
Correct option: (a) 4F
30. A body weighs 10 kg on earth. What will it weigh on the moon (1/6th gravity)?
- (a) 10 kg wt
- (b) 60 kg wt
- (c) 10/6 kg wt
- (d) 10/36 kg wt
Correct option: (c) 10/6 kg wt
31. In the above question, what will be the mass of the body on moon?
- (a) 10 kg
- (b) 60 kg
- (c) 10/6 kg
- (d) 10/36 kg
Correct option: (a) 10 kg
32. Earth and moon attract each other. Earth is heavier; the pull of earth compared to moon is
- (a) larger
- (b) equal
- (c) smaller
- (d) cannot say
Correct option: (b) equal
33. A body weighs 20 kg on the surface of earth. What is its weight at the centre of earth?
- (a) 20 kg
- (b) zero
- (c) 10 kg
- (d) 5 kg
Correct option: (b) zero
34. SI unit of weight is
- (a) newton
- (b) kilogram
- (c) gram
- (d) none of these
Correct option: (a) newton
35. The value of acceleration due to gravity on earth is
- (a) same at equator and poles
- (b) least on poles
- (c) least on equator
- (d) cannot say
Correct option: (c) least on equator
Class 9 Science Chapter 10 Question Answer
II. Assertion–Reason Type Questions
Codes:
(a) A & R true, R correct explanation
(b) A & R true, R NOT correct explanation
(c) A true, R false
(d) A false, R true
36. Assertion: The areal velocity of a planet around the sun is constant.
Reason: This is as per Kepler’s second law.
Answer: (a)
37. Assertion: Gravity is a special case of gravitation.
Reason: Gravity is the attraction between earth and any body.
Answer: (a)
38. Assertion: Every body loses weight at earth’s centre.
Reason: At the centre, g = 0.
Answer: (a)
39. Assertion: Bodies do not move towards each other due to gravitation.
Reason: Their gravitational force is too weak to overcome friction.
Answer: (a)
40. Assertion: A 1-kg mass experiences 9.8 N force on earth.
Reason: This force makes bodies fall to earth.
Answer: (a)
41. Assertion: Heavy bodies exert large gravitational forces.
Reason: Earth’s strong pull causes moon’s revolution.
Answer: (a)
42. Assertion: Areal velocity of a planet is constant.
Reason: As per Kepler’s first law.
Answer: (c)
43. Assertion: Gravitation is attraction between any two bodies.
Reason: Attraction towards earth is called gravity.
Answer: (b)
44. Assertion: Gravitational force is always attractive.
Reason: Bodies with mass never repel each other.
Answer: (c)
45. Assertion: G is force between unit masses at unit distance.
Reason: Gravitational force is never repulsive.
Answer: (b)
46. Assertion: Earth’s gravity holds the atmosphere.
Reason: As per Newton’s law of gravitation.
Answer: (a)
47. Assertion: Earth exerts 9.8 N force on 1-kg mass.
Reason: As per Newton’s law of gravitation.
Answer: (a)
48. Assertion: A 1-kg body falls towards earth.
Reason: Gravitational force = 9.8 N.
Answer: (a)
49. Assertion: Apple falls to earth, earth does not move.
Reason: Earth’s acceleration is nearly zero.
Answer: (a)
50. Assertion: Kepler’s 3rd law: T² ∝ r³.
Reason: Newton derived inverse-square law from it.
Answer: (b)
51. Assertion: G is called universal gravitational constant.
Reason: G does not depend on mass, distance, medium etc.
Answer: (a)
