Gravitation — Class 9 MCQs with Answers
Class 9 CBSE Science · Chapter 102
Pre-2026 syllabusThis chapter is from the older NCERT book. See the 2026-27 Class 9 Science chapters →
90 practice questions · 30 Easy · 30 Medium · 30 Hard · Updated
Jump to the 6 solved questions
Practise the most important Class 9 CBSE Science questions from Chapter 102, "Gravitation". You get 9 timed quizzes made from 90 NCERT-based MCQs, with answers and explanations. The questions are split into 30 Easy, 30 Medium and 30 Hard. Warm up on the basics, then move on to the exam-level questions that top scorers in CBSE Board exams and the JEE & NEET foundation years get right.
To score well in "Gravitation", focus on clear concepts in physics, chemistry and biology basics. Each MCQ here is timed and uses exam-style marking (+4 correct, −1 wrong, 0 skipped). This helps you stay accurate when time is short, just as real papers need. Every question has a short explanation, so a wrong answer becomes a quick lesson. It is the fastest way to fix gaps before a test.
Use this chapter for focused revision. Start with the Easy set to check your basics on Gravitation, then move to Medium and Hard to practise applying them. Your accuracy, streaks and XP save automatically. This chapter also adds to your overall Class 9 Science mastery score. Try the 6 sample questions below: tap an option to see the answer and a worked explanation. Sign in free to start practising.
Gravitation — important questions & MCQs with answers (Class 9 Science)
6 solved questions from this chapter's difficulty levels, each with its answer and explanation. Tap an option to check yourself.
0 of 6 answered
- Q1 of 6Easy
The universal gravitational constant G has the value approximately:
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Answer: 6.67 × 10⁻¹¹ N·m²/kg²
Explanation: G is Newton's gravitational constant, about 6.674 × 10⁻¹¹ N·m²/kg² — the same everywhere in the universe, unlike g (9.8 m/s²), which varies by planet.
- Q2 of 6Easy
Acceleration due to gravity (g) on Earth's surface is approximately:
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Answer: 9.8 m/s²
Explanation: g, the acceleration due to gravity near Earth's surface, is about 9.8 m/s²; it's often rounded to 10 m/s² for quick calculations.
- Q3 of 6Medium
Archimedes' principle states that the buoyant force on a body in fluid equals:
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Answer: The weight of fluid displaced
Explanation: Archimedes' principle: buoyant force on a submerged body equals the weight of the fluid it displaces — not the body's own weight or the fluid's volume alone.
- Q4 of 6Medium
Newton's universal law of gravitation: F =
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Answer: G m₁ m₂ / r²
Explanation: Newton's law of gravitation: F = Gm₁m₂/r² — force is inversely proportional to the SQUARE of the distance, not just the distance itself.
- Q5 of 6Hard
On the Moon, where g ≈ 1.6 m/s², a 60 kg person weighs:
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Answer: 96 N
Explanation: Weight = mg = 60 kg × 1.6 m/s² = 96 N on the Moon, far less than the same person's Earth weight (60 × 9.8 = 588 N) — mass stays 60 kg in both places; only weight changes.
- Q6 of 6Hard
A block of relative density 0.6 is placed in water. The fraction of the block submerged is:
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Answer: 0.6
Explanation: For a floating body, the submerged fraction equals its relative density: V_submerged/V = ρ_body/ρ_water = 0.6/1.0 = 0.6, so 60% stays underwater.
Gravitation notes: key concepts (Class 9 Science)
This chapter covers the universal law of gravitation, free fall and the value of g, then mass and weight, and the related ideas of thrust, pressure, buoyancy and Archimedes' principle.
- Universal law of gravitation
- Every body attracts every other with a force proportional to the product of their masses and inversely proportional to the square of the distance between them.
- Free fall and g
- An object falling under gravity alone is in free fall; its acceleration g ≈ 9.8 m/s² is independent of the object's mass.
- Mass vs weight
- Mass is the amount of matter (constant, in kg); weight is the gravitational force on it (W = mg, in newtons) and varies with g.
- Thrust and pressure
- Thrust is the force acting perpendicular to a surface; pressure is thrust per unit area, so a smaller area gives greater pressure.
- Buoyancy
- The upward force a fluid exerts on an immersed object; whether an object floats or sinks depends on its density relative to the fluid.
- Archimedes' principle
- An object immersed in a fluid experiences an upward buoyant force equal to the weight of the fluid it displaces.
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Gravitation — FAQs
What are the key concepts in Class 9 Science Gravitation?+
This chapter covers the universal law of gravitation, free fall and the value of g, then mass and weight, and the related ideas of thrust, pressure, buoyancy and Archimedes' principle. Key ideas include Universal law of gravitation, Free fall and g, Mass vs weight, Thrust and pressure, Buoyancy, Archimedes' principle.
What does Class 9 Science Chapter 102 (Gravitation) cover on XamBaaz?+
It has 90 NCERT-based MCQs on "Gravitation": 30 Easy, 30 Medium and 30 Hard. Together they make 9 timed quizzes, and you never get the same set twice. Every question has an instant explanation. They help you prepare for CBSE Board exams and the JEE & NEET foundation years.
Are these "Gravitation" questions free to practise?+
Yes. Sign in with Google to practise "Gravitation" free. Full unlimited access is ₹999/year. One year from the day you pay. You stay in Class 9 till 31 March; on 1 April your account moves up to Class 10 and the rest of your year carries over. No chapter is charged separately.
How should I revise "Gravitation" for the exam?+
Start with the Easy quiz to check your basics, then try Medium and Hard to practise applying them. There are 9 timed quizzes on this chapter, so you can come back for a fresh set instead of one you have seen. Read each explanation, retry the questions you miss, and track your accuracy until it stays high.
Are these "Gravitation" MCQs available with answers?+
Yes. 6 sample questions are on this page with answers: tap an option, or "Show answer", to see the correct option and a step-by-step explanation. Sign in free with Google to start practising, with instant scoring.
Is there negative marking in the "Gravitation" quizzes?+
Yes. The timed quizzes use exam-style marking: +4 for a right answer, −1 for a wrong one and 0 for a skip. MHT-CET and CBSE board papers have no negative marking. Our mocks for those are scored their way.
What are the important questions from Gravitation (Class 9 Science)?+
The questions that matter most test Universal law of gravitation, Free fall and g, Mass vs weight, Thrust and pressure, Buoyancy, Archimedes' principle. This page shows 6 solved important MCQs with answers and explanations. Sign in to practise all 90 questions on the chapter as timed quizzes.
Is there an online quiz for Gravitation?+
Yes — Class 9 Science Gravitation has timed online quizzes at Easy, Medium and Hard levels, with instant scoring and a worked explanation on every question. The first quiz on the chapter is free.
Are there question answers and extra questions for Gravitation (Class 9 Science)?+
Yes. This page has 6 solved questions on Gravitation, each with the correct answer and a short explanation. Sign in to practise all 90 questions on the chapter as timed quizzes.