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Class 9 Gravitation mcqs with Answers. We covered all the Class 9 Gravitation mcqs with Answers in this post for free so that you can practice well for the exam.
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Class 9 Gravitation mcqs with Answers for Students
In a battery, which type of energy transformation occurs?
A) Chemical energy to Light energy
B) Chemical energy to electrical energy
C) Mechanical energy to chemical energy
D) Chemical energy to sound energy
Option b – Chemical energy to electrical energy
Identify the incorrect statement about energy.
A) Energy due to a body’s position or deformation is termed potential energy.
B) A Mass (m) moving at velocity (v) has kinetic energy equal to (mv/2).
C) The gravitational potential energy of a Mass (M) raised by a height (H) from Earth’s surface is MgH.
D) A moving object has what is known as kinetic energy.
Option b – A Mass (m) moving at velocity (v) has kinetic energy equal to (mv/2).
Hydroelectric power plants use falling water to spin turbines. The rotation of the shaft converts the water’s potential energy into ______ energy.
A) Chemical
B) Thermal
C) Gravitational
D) Kinetic
Option d – Kinetic
James Prescott Joule established the foundation of the principle of conservation of ______.
A) Gravitational phenomena
B) Theory of vibrating receptacles
C) Gas diffusion concepts
D) Kinetic and potential energies forming mechanical energy
Option a – Gravitational phenomena
Kinetic and potential energies together make up ______ energy.
A) Chemical
B) Electrical
C) Mechanical
D) Heat
Option c – Mechanical
Which example illustrates gravitational potential energy?
A) Moving car
B) Bullet shot from a gun
C) Water stored behind a dam
D) Foot kicking a ball
Option c – Water stored behind a dam
The standard commercial unit used to measure electric energy is ______.
A) Watt-hour
B) Watt per hour
C) Kilowatt hour
D) Kilowatt per hour
Option c – Kilowatt hour
The electron-volt serves as a unit of ______.
A) Current
B) Energy
C) power
D) Potential difference
Option b – Energy
Approximately how many joules of mechanical energy equal one calorie of Heat energy?
A) 0.24
B) 0.48
C) 4.2
D) 2.4
Option c – 4.2
Pascal is the SI unit of ______, representing a force of 1 N applied evenly over 1 m².
A) Pressure
B) Energy
C) Mass density
D) power
Option a – Pressure
A cricket ball weighing 160 g is dropped from 50 m. What is its kinetic energy just before hitting the ground? (g = 10 m/s²)
A) 50 joules
B) 80 joules
C) 160 joules
D) 8 joules
Option b – 80 joules
Before it is released, a yo-yo primarily possesses ______ energy.
A) Light energy
B) Potential energy
C) Chemical energy
D) Kinetic energy
Option b – Potential energy
Which SET contains only energy units?
A) Calorie, Kilowatt hour, Newton
B) Joule, Calorie, Newton
C) Joule, Newton, Kilowatt hour
D) Joule, Calorie, Kilowatt hour
Option d – Joule, Calorie, Kilowatt hour
Who formulated the laws of levers and pulleys, enabling heavy objects to be moved with minimal force?
A) Archimedes
B) Eudoxus
C) Pythagoras
D) Democritus
Option a – Archimedes
Which pair of quantities shares identical dimensions?
A) power and radius of circular motion
B) work and angular displacement
C) work and torque
D) power and moment of inertia
Option c – work and torque
Which of these is not an energy unit?
A) Joule
B) Calorie
C) Kilowatt hour
D) Newton
Option d – Newton
In a metro station, about 20 people per minute ascend an escalator to a height of 15 m. If each person averages 50 kg and g = 10 m/s², what is the escalator’s power output?
A) 1.25 kW
B) 2.5 kW
C) 150 kW
D) 15 kW
Option b – 2.5 kW
At 1 bar pressure, a fixed amount of hydrogen gas occupies 2.27 litres. What will be its volume if pressure drops to 0.2 bar?
A) 12,250 cm³
B) 11,350 cm³
C) 10,270 cm³
D) 11.35 cm³
Option b – 11,350 cm³
Two objects, A (2 kg) and B (3 kg), fall from different heights. A takes 5 seconds and B 3 seconds to reach the ground. What is the ratio of their kinetic energies on impact?
A) 10/9
B) 2/3
C) 5/3
D) 50/27
Option d – 50/27
Which of these is not a recognized unit of pressure?
A) Pascal (Pa)
B) N/m²
C) J/m²
D) Bar
Option c – J/m²
If a moving object’s linear momentum doubles, its kinetic energy changes by a factor of ______.
A) 2
B) 4
C) 6
D) 8
Option b – 4
Which statement is correct for a freely falling object?
A) It moves with a uniform velocity.
B) It moves with a uniform speed.
C) It moves with a non-uniform acceleration.
D) It moves with a uniform acceleration.
Option d – It moves with a uniform acceleration.
A cannon fires a ball upward at 100 m/s. The total flight time is 20 s before it lands. After hitting the ground, it retains only 30% of its speed. To what height will it rise after the first bounce? (g = 10 m/s²)
A) 70 m
B) 100 m
C) 45 m
D) 50 m
Option c – 45 m
An iron nail sinks in water, but an iron ship remains afloat. Which of the following statements correctly explains this observation? a) The ship’s average density is greater than that of water b) The iron nail’s average density is greater than that of water c) The ship’s average density is lower than that of water d) The ship’s average density is equal to that of water. Select the correct code:
a) 2 and 3
b) 1 and 2
c) 1 and 4
d) 2 and 4
Option a – 2 and 3
Earth’s escape velocity is about 11.2 km/s. On a planet with half the Earth’s radius and four times its Mass density, the approximate escape speed (in km/s) would be:
a) 11.2
b) 15.8
c) 7.9
d) 5.6
Option b – 15.8
Two planets have masses in the ratio 1 : 7, and their diameters are in the ratio 2 : 1. The ratio of the gravitational forces they exert on each other is:
a) 1 : 7
b) 7 : 1
c) 2 : 1
d) 1 : 1
Option d – 1 : 1
The gravitational pull exerted by Earth on a body is known as:
a) Mass of the body
b) Weight of the body
c) Density of the body
d) Magnitude of the body
Option b – Weight of the body
Identify the statement that is incorrect:
a) Every object in the universe attracts every other object due to gravity
b) Newton’s law of Gravitation is derived from Newton’s laws of motion
c) The acceleration due to gravity (g) is zero at Earth’s center
d) Mass and weight are expressed in different units
Option b – Newton’s law of Gravitation is derived from Newton’s laws of motion
Find the minimum power needed to raise a 50 kg Mass through a height of 8 m in 10 s. (Take g = 10 m/s²)
a) 400 W
b) 40 W
c) 500 W
d) 50 W
Option a – 400 W
Which scientific principle, formulated in the 17th century, states that pressure applied to a confined Fluid is transmitted equally in all directions, regardless of the container’s shape?
a) Magnus’s Law
b) Graham’s Law
c) Pascal’s Law
d) Torricelli’s Law
Option c – Pascal’s Law
Find the INCORRECT statement about the universal law of Gravitation.
a) It is the force that keeps us attached to Earth.
b) It is the force responsible for tides caused by the stars and Earth.
c) It is the force that governs the motion of planets around the Sun.
d) It is the force that keeps the Moon moving around the Earth.
Select the correct fact about gravity.
a) The unit of g matches that of acceleration.
b) The unit of g matches that of velocity.
c) The unit of g matches that of Mass.
d) The unit of g matches that of friction.
Option a – The unit of g matches that of acceleration.
The law expressed as T² ∝ R³, linking a planet’s orbital period to its orbital radius, is known as:
a) Hubble’s Law
b) Copernicus’s Law
c) Kepler’s Third Law
d) Bragg’s Law
Option c – Kepler’s Third Law
Who formulated the three laws describing planetary motion?
a) Isaac Newton
b) Tycho Brahe
c) Johannes Kepler
d) Galileo Galilei
Option c – Johannes Kepler
Who demonstrated that in a vacuum all objects fall with the same acceleration and reach the ground simultaneously?
a) Galileo Galilei
b) Thomas Alva Edison
c) Isaac Newton
d) Albert Einstein
Option a – Galileo Galilei
A 2 kg Mass is dropped from a height of 10 m. What is the ratio of its potential energy to kinetic energy when it is at 5 m? (g = 10 m/s²)
a) 1 : 2
b) 1 : 1
c) 4 : 1
d) 1 : 4
Option b – 1 : 1
If G is the gravitational constant, M is Earth’s mass, and R is Earth’s radius, the correct formula for the acceleration due to gravity at the surface is:
a) GM / R²
b) GMR²
c) GM / R
d) GM² / R
Option a – GM / R²
Two identical iron spheres each of radius 1 m and density 3/(2π) kg/m³ are in contact. What is the gravitational force between them? (G = 6.67 × 10⁻¹¹ N·m²/kg²)
a) 0.667 N
b) 0.0667 N
c) 6.67 N
d) 66.7 N
Option c – 6.67 N
Which scientist’s principle states that the total energy per unit mass of a Fluid in motion—comprising kinetic, potential, and pressure energies—remains constant?
a) Daniel Bernoulli
b) Evangelista Torricelli
c) Blaise Pascal
d) Marie Poiseuille
Option a – Daniel Bernoulli
Who introduced the term “horsepower” to describe engine output?
a) Amedeo Avogadro
b) John Dalton
c) James Watt
d) Albert Einstein
Option c – James Watt
Which metric unit of pressure equals 0.986923 atm?
a) Quart
b) Yard
c) Bar
d) Gallon
Option c – Bar
For a book of mass m sliding a distance d on a smooth horizontal surface, the work done by gravity is:
a) Mgd
b) Md
c) md cos θ
d) 0
Option d – 0
Which relation between atmospheric pressure and bar is accurate?
a) 1 atm = 1 bar
b) 1 atm = 1.013 bar
c) 1 atm = 1.013 × 10⁵ bar
d) 1 atm = 10⁵ bar
Option b – 1 atm = 1.013 bar
Post-tensioning is most effective for:
a) Long spans
b) End spans
c) Edge spans
d) Break spans
Option a – Long spans
When an object is thrown upward, at the highest point of its path:
a) Potential energy is greatest.
b) Both kinetic and potential energies are greatest.
c) Kinetic energy is greatest.
d) Both kinetic and potential energies are zero.
Option a – Potential energy is greatest.
Dividing thrust in a liquid by which quantity gives the pressure?
a) Volume
b) Area
c) Density
d) Mass
Option b – Area
Which type of energy is displayed by falling coconuts, speeding vehicles, rolling stones, and flying aircraft?
a) Potential energy
b) Kinetic energy
c) Elastic energy
d) Radiant energy
Option b – Kinetic energy
What is the average kinetic energy per Molecule of an ideal gas at 25 °C (in joules)?
a) 6.17 × 10⁻²¹ J
b) 9.17 × 10²² J
c) 8.17 × 10⁻²¹ J
d) 7.17 × 10²⁰ J
Option b – 9.17 × 10²² J
A brick is pushed with a 7 N force and moves 5 m. How much work is done?
a) 25 J
b) 35 J
c) 40 J
d) 35 erg
Option b – 35 J
When a stone is thrown upward, which energy conversion occurs?
a) Kinetic energy changes to mechanical energy.
b) Potential energy changes to gravitational energy.
c) Mechanical energy changes to kinetic energy.
d) Kinetic energy changes to gravitational potential energy.
Option d – Kinetic energy changes to gravitational potential energy.
Pressure of a Human Body on Sand
a) Greater while standing than when lying down
b) Less while standing than when lying down
c) Identical whether standing or lying
d) Higher while standing during the day and lower while lying at night
Option a – Greater while standing than when lying down
Weight of an Object on a Planet with Nine Times Earth’s Gravity
a) Weight stays the same
b) Weight becomes 1 N
c) Weight increases ninefold
d) Weight decreases to one-ninth
Option c – Weight increases ninefold
Momentum and Kinetic Energy of a 10 kg Object Moving at 10 m/s
a) 100 N·s and 500 J
b) 100 N·s and 1000 J
c) 200 N·s and 500 J
d) 200 N·s and 1000 J
Option a – 100 N·s and 500 J
Quantity That Remains Constant During Free Fall ( Class 9 Gravitation mcqs with Answers )
a) Acceleration
b) Momentum
c) Potential energy
d) Kinetic energy
Option a – Acceleration
Factors Affecting Acceleration Due to Gravity on Earth ( Class 9 Gravitation mcqs with Answers )
a) Mass of Earth only
b) Radius of Earth only
c) Either mass or radius of Earth
d) Both mass and radius of Earth
Option d – Both mass and radius of Earth
Mobile Phone Microphone and Speaker 1. Microphone changes sound into a mechanical signal 2. Microphone converts sound into an electrical signal 3. Speaker turns a mechanical signal into sound 4. Speaker changes an electrical signal into sound. Which options are correct?
a) 1 and 3
b) 1 and 4
c) 2 and 3
d) 2 and 4
Option d – 2 and 4
Gravitational force if the Moon’s Distance from Earth is Reduced by Half ( Class 9 Gravitation mcqs with Answers )
a) Decreases to half its original value
b) Doubles its original value
c) Remains unchanged
d) Becomes four times its original value
Option d – Becomes four times its original value
Relationship Between Mass and Weight ( Class 9 Gravitation mcqs with Answers )
a) Weight changes with location, but mass remains constant
b) Mass changes with location, but weight stays constant
c) Both weight and mass remain unchanged everywhere
d) Both weight and mass change with location
Option a – Weight changes with location, but mass remains constant
Weight of a 50 kg Person in a Lift Accelerating Upward at 1 m/s² ( Class 9 Gravitation mcqs with Answers )
a) 490 N
b) 540 N
c) 440 N
d) 50 N
Option b – 540 N
Statement Incorrect for a Freely Falling Object ( Class 9 Gravitation MCQs with Answers )
a) It accelerates
b) Its momentum keeps changing
c) Its motion is affected only by gravity
d) Its motion is affected by both gravity and air resistance
Option d – Its motion is affected by both gravity and air resistance
Situations Where Applied Force Does Negative work ( Class 9 Gravitation MCQs with Answers )
a) Force and displacement form an angle of 135°
b) Force and displacement are parallel
c) Force and displacement are perpendicular
d) Force and displacement form an angle of 45°
Option a – Force and displacement form an angle of 135°
Speed of a 2 kg Object with 100 J of Kinetic Energy ( Class 9 Gravitation MCQs with Answers )
a) 10.0 m/s
b) 11.1 m/s
c) 11.2 m/s
d) 12.1 m/s
Option a – 10.0 m/s
Nature of Buoyant Force on Immersed Objects ( Class 9 Gravitation MCQs with Answers )
a) Downward pressure
b) Downward force
c) Upward pressure
d) Upward force
Option d – Upward force
Dimensions of the Gravitational Constant ( Class 9 Gravitation MCQs with Answers )
a) M L T⁻²
b) M L¹ T⁻²
c) M² L⁻¹ T⁻²
d) M-1 L3 T2
Option d – M-1 L3 T2
power Needed to Lift an 8 kg Mass 4 m in 2 Seconds (g = 10 m/s²)
a) 80 W
b) 160 W
c) 320 W
d) 640 W
Option b – 160 W
Gravitational Forces Between Earth and Moon ( Class 9 Gravitation MCQs with Answers )
a) Earth’s gravitational pull on the Moon is stronger than the Moon’s pull on Earth
b) Moon’s gravitational pull on Earth is stronger than Earth’s pull on the Moon
c) Both forces are equal in size and direction
d) Both forces are equal in size but opposite in direction
Option d – Both forces are equal in size but opposite in direction
We covered all the Class 9 Gravitation MCQs with Answers above in this post for free so that you can practice well for the exam.
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