Gravitation Class 9 MCQs with Answers & Numericals
Gravitation Class 9 MCQs with Answers & Numericals
Class: CBSE Class 9
Subject: Science
Section: Physics
Topic: Gravitation
These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 9 Science Board Examinations preparation.
Subject: Science
Section: Physics
Topic: Gravitation
These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 9 Science Board Examinations preparation.
1. The force that attracts objects toward Earth is called:
Answer: B
Gravitational force is the universal force of attraction between any two masses.
2. Who discovered the law of gravitation?
Answer: B
Sir Isaac Newton proposed the universal law of gravitation.
3. SI unit of gravitational force:
Answer: B
Force unit is Newton (N).
4. Value of g on Earth:
Answer: A
Acceleration due to gravity ≈ 9.8 m/s².
5. Weight is equal to:
Answer: A
Weight = Mass × Acceleration due to gravity.
6. Unit of weight:
Answer: B
Weight is a force → unit Newton.
7. If mass doubles, gravitational force:
Answer: B
From F ∝ m₁m₂ → doubling mass doubles force.
8. Force between objects decreases when distance:
Answer: B
F ∝ 1/r² — inverse square law.
9. Free fall means:
Answer: B
Only gravity acts in free fall.
10. Weight on Moon is:
Answer: B
Moon’s gravity ≈ 1/6 Earth’s.
11. Mass remains constant because:
Answer: B
Mass is intrinsic property.
12. Thrust per unit area is:
Answer: B
Pressure = Thrust / Area.
13. SI unit of pressure:
Answer: A
1 Pascal = 1 N/m².
14. Buoyant force acts:
Answer: A
Fluid exerts upward force on immersed body.
15. Archimedes’ principle relates to:
Answer: B
Loss in weight = weight of displaced fluid.
16. Relative density has no unit because:
Answer: A
Units cancel in ratio.
17. If g increases, weight:
Answer: A
W = mg → directly proportional.
18. Object floats when:
Answer: B
Lower density → buoyant force supports weight.
19. Gravitational constant symbol:
Answer: B
G is universal gravitational constant.
20. If mass = 10 kg, g = 9.8 m/s², weight = ?
Answer: B
W = mg = 10 × 9.8 = 98 N.