🌍 Gravitation – Class 9 Science MCQs

Section 1: Universal Law of Gravitation & Its Importance (Q1–Q25)

Q1. Who gave the Universal Law of Gravitation?

A. Galileo
B. Kepler
C. Newton
D. Einstein

✅ Correct Answer: C. Newton

Explanation:

• A. Galileo studied falling bodies, not universal gravitation.
• B. Kepler gave planetary motion laws.
• C. Correct, Newton proposed the Universal Law of Gravitation.
• D. Einstein gave General Theory of Relativity.

Q2. According to the law of gravitation, force between two masses is:

A. Directly proportional to square of distance
B. Directly proportional to product of masses
C. Inversely proportional to product of masses
D. Inversely proportional to masses

✅ Correct Answer: B. Directly proportional to product of masses

Explanation:

• Force ∝ m₁ × m₂.
• Option A is wrong (actually inversely ∝ distance²).

Q3. Gravitational force is proportional to:

A. 1/d
B. 1/d²
C. d²
D. d³

✅ Correct Answer: B. 1/d²

Explanation:

• Universal law → F ∝ 1/r².

Q4. The value of gravitational constant (G) is:

A. 6.67 × 10⁻¹¹ N m²/kg²
B. 9.8 m/s²
C. 3 × 10⁸ m/s
D. 1.6 × 10⁻¹⁹ C

✅ Correct Answer: A. 6.67 × 10⁻¹¹ N m²/kg²

Q5. Unit of G is:

A. N/kg
B. N m²/kg²
C. m/s²
D. N m/kg

✅ Correct Answer: B. N m²/kg²

Q6. The value of G was first measured by:

A. Newton
B. Cavendish
C. Kepler
D. Galileo

✅ Correct Answer: B. Cavendish

Q7. Which of the following is true?

A. Gravity exists only on Earth
B. Gravitational force is only attractive
C. Gravitational force is only repulsive
D. Gravitational force depends on charge

✅ Correct Answer: B. Gravitational force is only attractive

Q8. Universal law of gravitation explains:

A. Falling of objects on Earth
B. Revolution of Moon around Earth
C. Motion of planets around Sun
D. All of the above

✅ Correct Answer: D. All of the above

Q9. Force of gravity between two objects increases when:

A. Masses decrease
B. Distance increases
C. Masses increase
D. None

✅ Correct Answer: C. Masses increase

Q10. Why don’t we feel gravitational attraction between two human bodies?

A. Masses are too small
B. Distance is too large
C. G is too large
D. Force doesn’t exist

✅ Correct Answer: A. Masses are too small

Q11. Which is not affected by gravitation?

A. Motion of planets
B. Motion of satellites
C. Falling of apple
D. Nuclear force

✅ Correct Answer: D. Nuclear force

Q12. The law of gravitation is applicable to:

A. Earth only
B. Earth and Moon only
C. All objects with mass
D. Only stars

✅ Correct Answer: C. All objects with mass

Q13. Gravitational force between two 1 kg masses 1 m apart is:

A. 6.67 × 10⁻¹¹ N
B. 9.8 N
C. 0.0001 N
D. Zero

✅ Correct Answer: A. 6.67 × 10⁻¹¹ N

Q14. Gravitation provides:

A. Attractive force only
B. Repulsive force only
C. Both attractive & repulsive
D. No force

✅ Correct Answer: A. Attractive force only

Q15. The force with which Earth attracts objects is called:

A. Gravitational force
B. Magnetic force
C. Electric force
D. Normal force

✅ Correct Answer: A. Gravitational force

Q16. Gravitation is important because it:

A. Binds solar system
B. Holds atmosphere
C. Causes rainfall
D. All of the above

✅ Correct Answer: D. All of the above

Q17. Which scientist discovered G experimentally?

A. Newton
B. Cavendish
C. Rutherford
D. Einstein

✅ Correct Answer: B. Cavendish

Q18. Gravitational force between Earth and Moon provides:

A. Centripetal force for Earth
B. Centripetal force for Moon
C. Centrifugal force
D. Frictional force

✅ Correct Answer: B. Centripetal force for Moon

Q19. G is:

A. Universal constant
B. Varies with location
C. Varies with altitude
D. Varies with planet

✅ Correct Answer: A. Universal constant

Q20. Gravitational force is weakest among:

A. Strong nuclear force
B. Electromagnetic force
C. Weak nuclear force
D. Gravitational force

✅ Correct Answer: D. Gravitational force

Q21. Which law explains tides in oceans due to Moon?

A. Law of inertia
B. Law of gravitation
C. Law of magnetism
D. Law of energy

✅ Correct Answer: B. Law of gravitation

Q22. Weight of body on Moon is about:

A. 1/6 of Earth
B. 1/2 of Earth
C. 1/3 of Earth
D. Equal to Earth

✅ Correct Answer: A. 1/6 of Earth

Q23. Mass of body on Moon compared to Earth is:

A. More
B. Less
C. Same
D. Cannot say

✅ Correct Answer: C. Same

Q24. Which quantity remains same everywhere in universe?

A. Weight
B. Mass
C. Acceleration due to gravity
D. Force

✅ Correct Answer: B. Mass

Q25. The law of gravitation was first applied successfully to explain:

A. Atomic structure
B. Solar system
C. Structure of Earth
D. Rainfall

✅ Correct Answer: B. Solar system

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