NCERT  ·  Science  ·  Class IX  ·  Ch.12

Gravitation
MCQ Master Series

Universal Gravitation · g · Weight · Free Fall · Pressure · Archimedes · Buoyancy

🎯 50 Questions
⏱ 32 min Suggested
📊 3 Difficulty Tiers
🗂 5 Topics
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Question Intelligence

Quiz Analytics

A data-driven breakdown of all 50 questions by difficulty, exam origin and topic distribution.

📈 Distribution Overview

50
Total Questions
CBSE Board
25
State Board
15
Olympiad Level
10

🗂 Topic Coverage

Universal Law of Gravitation
20%
Free Fall & Value of g
22%
Mass vs Weight
16%
Thrust, Pressure & Density
18%
Archimedes' Principle & Buoyancy
24%
25
CBSE Board
15
State Board
10
Olympiad Level
Conceptual Framework

Key Concept Highlights

6 foundational pillars that power every question in this quiz. Understand these, and the answers follow naturally.

🌍
Universal Law of Gravitation
Every object in the universe attracts every other object with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. F = Gm₁m₂/r².
🍎
Value of g
g = GM/R² on Earth's surface ≈ 9.8 m/s². Decreases with altitude and depth. Slightly less at equator than poles (Earth is oblate spheroid). Moon's g = 1/6 of Earth's g.
⚖️
Mass vs Weight
Mass: scalar, measure of matter (kg), constant everywhere. Weight: vector, gravitational force (W = mg, unit: newton), varies with location. Mass = 6 kg on Earth AND Moon; weight differs.
💧
Pressure & Thrust
Thrust: force acting normally on a surface (N). Pressure = Thrust/Area (Pa). Liquids exert pressure in all directions. Pressure increases with depth: P = ρgh. Basis of hydraulic machines.
🛁
Archimedes' Principle
When a body is immersed in a fluid, it experiences an upward buoyant force equal to the weight of the fluid displaced. Buoyancy = ρ_fluid × V_submerged × g.
🚢
Floatation
A body floats when buoyant force = weight of body. Relative density (no unit) = density of substance / density of water. If RD < 1, floats; if RD > 1, sinks (in water).
Pedagogical Value

Why MCQs Matter

Multiple-choice questions are not mere guessing games — they are the sharpest diagnostic tool available to a competitive exam aspirant.

~12%

of CBSE Class IX Science — gravitation numericals span the widest range in Class IX Physics

Quick Reference

Important Formula Capsules

7 must-memorise equations that surface repeatedly across CBSE and JEE papers.

Universal Gravitation
\[ F = \dfrac{Gm_1 m_2}{r^2} \]
G (value)
\[ G = 6.674 \times 10^{-11}\ \text{N\,m}^2\text{kg}^{-2} \]
Acceleration due to g
\[ g = \dfrac{GM}{R^2} \approx 9.8\ \text{m/s}^2 \]
Weight
\[ W = mg \]
Pressure
\[ P = \dfrac{F}{A} = \rho g h \]
Relative Density
\[ \text{RD} = \dfrac{\rho_{\text{substance}}}{\rho_{\text{water}}} \]
Buoyant Force
\[ F_b = \rho_{\text{fluid}} \cdot V_{\text{sub}} \cdot g \]
Learning Outcomes

What You Will Learn

By completing this quiz set you will have exercised all the following competencies.

01 State Newton's Universal Law of Gravitation and define the gravitational constant G
02 Derive the expression for acceleration due to gravity on Earth's surface
03 Explain why g varies with altitude, depth, latitude, and on other celestial bodies
04 Distinguish mass from weight with three clear differences
05 Apply Archimedes' principle to explain floating, sinking, and relative density
06 Calculate buoyant force and predict whether an object will float or sink
Exam Preparation

Strategy & Preparation Tips

4 evidence-based strategies to maximise your score in CBSE Boards and JEE.

Step 01
Gravitation Formula Flags
F = Gm₁m₂/r² — note r² in denominator (inverse square law). If distance doubles, force becomes 1/4. CBSE gives "distance tripled, new force = ?" as a direct MCQ.
Step 02
g on Moon = g/6 on Earth
If weight on Earth = 60 N, weight on Moon = 10 N. Mass remains 60/9.8 kg on BOTH. This exact comparison is a board exam guaranteed question.
Step 03
Archimedes Application Map
Floating ship: weight = buoyancy. Submerged submarine: weight > buoyancy. Hydrometer, lactometer, ship design — all use Archimedes. One application per 2 marks.
Step 04
Pressure – Depth Link
P = ρgh — deeper means more pressure. Dam walls are thicker at the base. A column of mercury 76 cm tall = 1 atm. This quantitative link earns marks in 2-mark short answers.

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🎯 Knowledge Check

Science — Gravitation

50 Questions Class 9 MCQs
1
The force of attraction between any two objects in the universe is called:
2
Who gave the Universal Law of Gravitation?
3
The Universal Law of Gravitation states that every object attracts every other object with a force which is:
4
What does ‘G’ represent in the Universal Law of Gravitation?
5
The value of gravitational constant (G) is:
6
The force of gravitation between two objects depends on:
7
The acceleration due to gravity on Earth is approximately:
8
The acceleration due to gravity does not depend on:
9
The value of ‘g’ is maximum at:
10
The value of ‘g’ decreases as we:
11
Weight of an object is:
12
Mass of an object is measured in:
13
Weight is measured in:
14
Which of the following quantities remains constant everywhere?
15
On the Moon, a body will weigh:
16
The Earth attracts the Moon because of:
17
The motion of the Moon around Earth is due to:
18
The universal law of gravitation helps in calculating:
19
The mass of Earth is approximately:
20
The radius of Earth is approximately:
21
The formula for gravitational force is:
22
The value of ‘g’ on the surface of Earth is obtained using formula:
23
Weightlessness occurs when:
24
The density of Earth is about:
25
Which of these has the least gravitational force?
26
The pressure exerted by a liquid column depends on:
27
The unit of pressure is:
28
Pressure in a fluid at rest increases with:
29
Buoyant force acts:
30
The upward force exerted by a liquid on a body immersed in it is called:
31
When a body is fully or partially immersed in a fluid, it experiences an upward force equal to:
32
Archimedes’ principle helps to determine:
33
Thrust is defined as:
34
SI unit of thrust is:
35
The SI unit of density is:
36
Relative density has:
37
The relative density of water is:
38
If a body floats on water, its weight is:
39
A body sinks in water when:
40
A body will float in a liquid if:
41
The loss of weight of a body immersed in a liquid is equal to:
42
An object weighs 10 N in air and 6 N in water. The buoyant force on it is:
43
The acceleration due to gravity on the Moon is approximately:
44
A freely falling body on Earth experiences:
45
The gravitational force between two bodies decreases if:
46
The path of planets around the Sun is:
47
The force which acts on the Earth and keeps it moving around the Sun is:
48
The gravitational force between two objects will become four times if:
49
If the mass of one body is doubled, the gravitational force between two bodies:
50
The gravitational force between two objects is zero when:
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ACADEMIA AETERNUM तमसो मा ज्योतिर्गमय · Est. 2025
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Frequently Asked Questions

It is the acceleration produced in a body due to gravitational force, denoted by \(g\), approximately \(9.8\, m/s^2\) on Earth.

Because acceleration due to gravity is constant and does not depend on mass when air resistance is negligible.

Mass is the amount of matter; weight is the force of gravity on the mass and can vary by location.

Moon’s gravity is about 1/6th Earth's, so weight decreases but mass remains the same.

Buoyancy is the upward force exerted by a fluid that opposes the weight of an object immersed in it.

It decreases gradually since gravitational pull gets weaker with height.

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    ACADEMIA AETERNUM तमसो मा ज्योतिर्गमय · Est. 2025
    Sharing this chapter
    Gravitation | Science Class 9 | Academia Aeternum
    Gravitation | Science Class 9 | Academia Aeternum — Complete Notes & Solutions · academia-aeternum.com
    🎓 Class 9 📐 Science 📖 NCERT ✅ Free Access 🏆 CBSE · JEE
    Share on
    WhatsApp
    Telegram
    X / Twitter
    Facebook
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    Threads
    Pinterest
    LinkedIn
    Quora
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    Reddit
    Email
    academia-aeternum.com/class-9/science/gravitation/mcqs/ Copy link
    💡
    Exam tip: Sharing chapter notes with your study group creates a reinforcement loop. Teaching a concept is the fastest path to mastering it.

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