Gravitation Class 9 MCQs help students understand how gravity affects objects on Earth and why every object experiences a force of attraction. This chapter explains important Physics concepts related to gravitation, gravity, free fall, buoyancy, pressure, and floatation. From falling fruits to floating ships, many daily-life observations are connected with the concepts discussed in this chapter.
Students usually find Gravitation interesting because it explains natural phenomena that we experience regularly. At the same time, many students get confused between concepts like mass and weight, pressure and thrust, or gravity and gravitation while solving objective questions. Numerical problems based on pressure, density, and acceleration due to gravity also create confusion during exams. That is why regular practice of Gravitation Class 9 MCQs becomes important for improving conceptual clarity and application-based understanding.
These MCQs are prepared according to the latest CBSE Board and NCERT syllabus. The questions help students strengthen Physics concepts, improve numerical accuracy, and prepare more confidently for school tests, periodic assessments, and final examinations.
Important Concepts Covered in Gravitation Class 9 MCQs
These Gravitation Class 9 MCQs cover all major concepts from Chapter 9 of Class 9 Science.
- Gravitation
- Universal law of gravitation
- Gravity
- Free fall
- Acceleration due to gravity
- Mass and weight
- Thrust and pressure
- Buoyancy
- Relative density
- Archimedes’ principle
- Floatation
- Density-related numerical questions
- Pressure calculations
- Practical applications of gravity
Some questions are directly formula-based while others focus more on real-life understanding and conceptual reasoning.
Everyday Observations Related to Gravitation
Many concepts from this chapter can be understood more clearly through observations from daily life.
- Fruits fall toward the Earth because of gravity.
- Rainwater falls downward due to gravitational pull.
- Ships float on water because of buoyant force.
- Objects feel lighter in water because of upthrust.
- Divers experience higher pressure as they move deeper underwater.
- A parachute slows down the fall of a person because of air resistance and gravitational force interaction.
Questions based on practical situations are commonly asked in Gravitation Class 9 MCQs.
Gravitation Class 9 Chapter 9 MCQs with Answers
Q. Two objects of masses M and m are separated by a distance d. If the mass of the first object is doubled and the distance remains unchanged, what happens to the gravitational force between them?
A) It remains the same
B) It doubles
C) It halves
D) It quadruples
Answer: B
Explanation: According to the universal law of gravitation, force is directly proportional to mass. Doubling one mass doubles the gravitational force.
Q. An object is dropped from a height. Ignoring air resistance, which statement about its motion is correct?
A) Acceleration increases continuously
B) Acceleration decreases continuously
C) Acceleration remains constant
D) Velocity remains constant
Answer: C
Explanation: In free fall near Earth’s surface, acceleration due to gravity remains nearly constant.
Q. A person’s mass on Earth is sixty kilograms. What will be the person’s mass on the Moon?
A) Ten kilograms
B) Sixty kilograms
C) Three hundred sixty kilograms
D) Zero kilograms
Answer: B
Explanation: Mass does not change with location. Only weight changes due to gravity.
Q. What happens to the weight of an object when taken from Earth to the Moon?
A) It becomes zero
B) It doubles
C) It becomes one-sixth
D) It remains unchanged
Answer: C
Explanation: Gravity on the Moon is approximately one-sixth of Earth’s gravity, so weight becomes one-sixth.
Q. Which quantity remains constant for a freely falling object near Earth?
A) Velocity
B) Speed
C) Acceleration due to gravity
D) Kinetic energy
Answer: C
Explanation: The acceleration due to gravity remains constant during free fall.
Q. The SI unit of gravitational force is:
A) Joule
B) Newton
C) Pascal
D) Watt
Answer: B
Explanation: Gravitational force is measured in Newtons.
Q. Relative density is the ratio of:
A) Mass to volume
B) Density of substance to density of water
C) Weight to volume
D) Mass to density
Answer: B
Explanation: Relative density compares the density of a substance with water.
Q. An object has a mass of five hundred grams and a volume of two hundred cubic centimetres. What is its relative density?
A) Zero point four
B) Two point five
C) Five hundred
D) Two hundred
Answer: B
Explanation: Density equals five hundred divided by two hundred, which gives two point five grams per cubic centimetre. Relative density is therefore two point five.
Q. Where is the value of acceleration due to gravity greatest on Earth?
A) At the equator
B) At the poles
C) Same everywhere
D) At high mountains
Answer: B
Explanation: Earth is slightly flattened at the poles, making gravity stronger there.
Q. A ship floats on water. If more cargo is loaded onto it, what happens?
A) It rises higher
B) It sinks deeper
C) It remains unchanged
D) It overturns immediately
Answer: B
Explanation: More weight requires more buoyant force, so the ship displaces more water and sinks deeper.
Q. What is the buoyant force acting on an object equal to?
A) Weight of the object
B) Weight of displaced fluid
C) Density of object
D) Volume of object only
Answer: B
Explanation: According to Archimedes’ Principle, buoyant force equals the weight of displaced fluid.
Q. Which factor does NOT affect buoyant force?
A) Volume submerged
B) Density of fluid
C) Acceleration due to gravity
D) Mass of object
Answer: D
Explanation: Buoyant force depends on fluid properties and displaced volume, not directly on object mass.
Q. If Earth’s radius becomes half while mass remains unchanged, gravity on the surface becomes:
A) Half
B) Double
C) Four times
D) Same
Answer: C
Explanation: Gravity is inversely proportional to the square of radius. Halving radius increases gravity four times.
Q. A stone is dropped from rest. Assuming acceleration due to gravity is ten metres per second squared, what is its velocity after two seconds?
A) Ten metres per second
B) Fifteen metres per second
C) Twenty metres per second
D) Twenty-five metres per second
Answer: C
Explanation: Velocity equals acceleration multiplied by time, giving twenty metres per second.
Q. Why does pressure increase with depth in a liquid?
A) Density increases
B) More liquid exists above
C) Gravity changes
D) Liquid becomes heavier
Answer: B
Explanation: Greater depth means more liquid above, producing greater pressure.
Q. If the distance between two objects becomes one-third and one mass doubles, gravitational force becomes:
A) Three times
B) Six times
C) Nine times
D) Eighteen times
Answer: D
Explanation: Force varies inversely with square of distance. Reducing distance to one-third increases force nine times, then doubling mass gives eighteen times.
Q. Which phenomenon is NOT directly explained by gravitation?
A) Falling objects
B) Planetary motion
C) Floating of ships
D) Satellite motion
Answer: C
Explanation: Floating depends mainly on buoyancy and Archimedes’ Principle.
Q. Two objects of different masses are dropped in vacuum. Which reaches the ground first?
A) Heavier object
B) Lighter object
C) Both together
D) Depends on shape
Answer: C
Explanation: In vacuum, all objects fall with the same acceleration due to gravity.
Q. Which statement correctly distinguishes mass and weight?
A) Mass is vector and weight is scalar
B) Mass measured in Newtons
C) Mass remains constant while weight varies
D) Mass is gravitational force
Answer: C
Explanation: Mass is constant everywhere, but weight depends on gravity.
Q. A solid object fully submerged in water has a volume of zero point zero five cubic metres. If water density is one thousand kilograms per cubic metre and gravity is ten metres per second squared, find buoyant force.
A) Fifty Newtons
B) One hundred Newtons
C) Five hundred Newtons
D) Five thousand Newtons
Answer: C
Explanation: Buoyant force equals density multiplied by gravity and volume. Result equals five hundred Newtons.
Q. What is the weight of an object at the centre of Earth?
A) Maximum
B) Zero
C) Same as surface
D) Slightly less
Answer: B
Explanation: Gravity becomes zero at Earth’s centre, so weight is zero.
Q. Why is gravitational force between everyday objects difficult to notice?
A) Small masses
B) Large distances
C) Very small gravitational constant
D) All of these
Answer: D
Explanation: All these reasons make gravitational attraction between ordinary objects extremely weak.
Q. An iron nail sinks in water but floats in mercury because:
A) Mercury is denser than iron
B) Mercury provides greater buoyant force
C) Water has less gravity
D) Iron becomes lighter in mercury
Answer: B
Explanation: Mercury’s high density produces enough buoyant force to float the nail.
Q. Which statement about gravitational field lines is incorrect?
A) They point towards mass
B) They are perpendicular to surface
C) Closer lines mean stronger field
D) They can intersect
Answer: D
Explanation: Gravitational field lines never intersect because the field has only one direction at a point.
Q. The minimum velocity required to escape Earth’s gravity permanently is called:
A) Orbital velocity
B) Terminal velocity
C) Escape velocity
D) Initial velocity
Answer: C
Explanation: Escape velocity is the minimum speed needed to leave Earth’s gravitational field.
Q. In free fall, what assumption allows all objects to fall equally fast?
A) Same material
B) Same shape
C) No air resistance
D) Small height only
Answer: C
Explanation: Without air resistance, all objects accelerate equally under gravity.
Q. Thrust is always applied:
A) Parallel to surface
B) At an angle
C) Perpendicular to surface
D) Tangentially
Answer: C
Explanation: Thrust acts perpendicular to a surface.
Q. An object weighs ten Newtons in air and eight Newtons in water. What is the buoyant force?
A) One Newton
B) Two Newtons
C) Eight Newtons
D) Ten Newtons
Answer: B
Explanation: Buoyant force equals loss of weight in liquid, which is two Newtons.
Q. At terminal velocity, which statement is correct?
A) Gravity is greater
B) Buoyant force is greater
C) Net force becomes zero
D) Object accelerates downward
Answer: C
Explanation: At terminal velocity, upward and downward forces balance each other.
Q. An object floats with three-fourths of its volume submerged in water. What is the ratio of object density to water density?
A) One-fourth
B) One-half
C) Three-fourths
D) Four-thirds
Answer: C
Explanation: For floating objects, density ratio equals submerged fraction. Hence the ratio is three-fourths.
Instructions Before Solving the Gravitation Class 9 MCQs
- Revise formulas related to gravity, pressure, and density carefully.
- Understand the difference between mass and weight properly before attempting conceptual questions.
- Read units carefully during numerical calculations.
- Focus on practical applications of buoyancy and floatation.
- Do not confuse thrust with pressure in objective questions.
- Practice density and pressure numericals regularly.
- Re-attempt incorrect questions after revision for better understanding.
Sometimes students understand the formula correctly but still select the wrong answer because of unit confusion or conceptual misunderstanding.
Common Areas of Confusion in Gravitation Class 9
Many students lose marks in objective questions because some concepts from this chapter are closely related to each other. Some common confusions are listed below.
- Gravity and gravitation confusion
- Mass and weight misunderstanding
- Pressure and thrust comparison errors
- Density and relative density confusion
- Incorrect understanding of buoyant force
- Mistakes in acceleration due to gravity calculations
- Sign and unit mistakes in numerical questions
Most mistakes happen when students memorise definitions without understanding the practical meaning behind the concepts.
Why Practice Gravitation Class 9 MCQs?
Practicing Gravitation Class 9 MCQs helps students improve conceptual understanding and numerical solving skills. Since this chapter includes practical applications, formulas, and reasoning-based questions, regular MCQ practice becomes important for proper exam preparation.
- These objective questions help students:
- Understand gravity-related concepts more clearly
- Improve pressure and density calculations
- Strengthen practical Physics understanding
- Prepare for school exams and tests
- Improve confidence in application-based questions
Regular revision with MCQs also helps students reduce confusion between similar Physics concepts.
Conclusion
Practicing Gravitation Class 9 MCQs regularly helps students strengthen their understanding of gravity, buoyancy, pressure, and floatation concepts. These objective questions improve conceptual clarity, numerical accuracy, and application-based reasoning, helping students prepare more effectively for Class 9 Science examinations.