In this article, we will cover Class 9 Physics MCQs based on the NCERT syllabus, focusing on essential topics like Motion, Force and Laws of Motion, Work and Energy, and Sound. Practicing these MCQs will not only help students understand key concepts but also improve problem-solving skills, making them exam-ready with greater confidence.”
1. What is the SI unit of speed?
a) Kilometer
b) Meter per second
c) Second
d) Meter
View Answer
Explanation: The SI unit of speed is meter per second (m/s). This unit represents how much distance an object travels in one second.
2. Which of the following is the correct formula for velocity?
a) v = u + at
b) v = u – at
c) v = u × at
d) v = u + a/t
View Answer
Explanation: The formula for velocity is v = u + at, where ‘u’ is the initial velocity, ‘a’ is the acceleration, and ‘t’ is time. This equation describes how the velocity changes with constant acceleration.
3. Which of the following describes an object in uniform motion?
a) The object is accelerating
b) The object is at rest
c) The object is changing its direction
d) The object covers equal distances in equal intervals of time
View Answer
Explanation: Uniform motion means the object travels equal distances in equal time intervals, implying it moves at a constant speed.
4. Which of the following is NOT a type of motion?
a) Circular motion
b) Rectilinear motion
c) Irregular motion
d) Rotational motion
View Answer
Explanation: Irregular motion is not recognized as a specific type of motion in physics, unlike rectilinear, circular, and rotational motions.
5. What is the acceleration of an object in free fall near the surface of the Earth?
a) 0 m/s2
b) 9.8 m/s2
c) 1 m/s2
d) 10 m/s2
View Answer
Explanation: Near Earth’s surface, objects experience an acceleration due to gravity of approximately 9.8 m/s2, meaning their velocity increases by 9.8 meters per second every second.
6. An object starts from rest and moves with a constant acceleration of 2 m/s2. What is its velocity after 5 seconds?
a) 10 m/s
b) 2 m/s
c) 20 m/s
d) 5 m/s
View Answer
Explanation: The velocity can be calculated using the equation v = u + at. Since the initial velocity (u) is 0 and acceleration (a) is 2 m/s2, the velocity after 5 seconds is v = 0 + 2 × 5 = 10 m/s.
7. If the displacement-time graph is a straight line, what can be said about the motion of the object?
a) The object is at rest
b) The object is in circular motion
c) The object is accelerating
d) The object is moving with uniform velocity
View Answer
Explanation: A straight line on a displacement-time graph indicates that the object is moving at a constant speed, meaning it has uniform velocity.
8. What is the relationship between speed, distance, and time?
a) Speed = Distance × Time
b) Speed = Distance / Time
c) Speed = Time / Distance
d) Speed = Time × Distance
View Answer
Explanation: Speed is calculated by dividing the total distance traveled by the total time taken. It gives the rate at which an object moves.
9. If an object covers 50 meters in 5 seconds, what is its speed?
a) 5 m/s
b) 10 m/s
c) 2 m/s
d) 25 m/s
View Answer
Explanation: Speed is calculated as Distance / Time. In this case, the object travels 50 meters in 5 seconds, so its speed is 50/5 = 10 m/s.
10. Which of the following does NOT affect the speed of an object?
a) The distance traveled
b) The object’s mass
c) The force acting on the object
d) The time of motion
View Answer
Explanation: The speed of an object is influenced by factors such as the distance traveled, the time taken, and the force acting on it. However, the object’s mass does not directly affect its speed.
11. What does Newton’s Second Law of Motion state?
a) An object will remain at rest or in uniform motion unless acted upon by an external force
b) Every action has an equal and opposite reaction
c) Force is equal to mass times acceleration
d) Force is inversely proportional to mass
View Answer
Explanation: Newton’s Second Law states that the force acting on an object is equal to the mass of the object times its acceleration (F = ma). This law explains how the velocity of an object changes when a force is applied to it.
12. What is the first law of motion also known as?
a) Law of inertia
b) Law of interaction
c) Law of force
d) Law of acceleration
View Answer
Explanation: Newton’s First Law of Motion is also known as the Law of Inertia. It states that an object will remain at rest or continue moving in a straight line at constant speed unless acted upon by an external force.
13. What is the force that acts on an object when it is moving in a circular path?
a) Frictional force
b) Tension
c) Gravitational force
d) Centripetal force
View Answer
Explanation: Centripetal force is the force that acts on an object moving in a circular path. It pulls the object toward the center of the circle, ensuring the object follows the circular path.
14. Which law of motion is associated with the concept of action and reaction forces?
a) Newton’s Third Law
b) Newton’s First Law
c) Newton’s Second Law
d) Newton’s Law of Gravitation
View Answer
Explanation: Newton’s Third Law states that for every action, there is an equal and opposite reaction. This law explains how forces always come in pairs.
15. Which is an example of inertia in daily life?
a) A stone falling from a height
b) A passenger moving forward when the bus suddenly stops
c) A car skidding on a wet road
d) A bus moving faster on a smooth road
View Answer
Explanation: The passenger’s forward motion when the bus stops is an example of inertia, where the passenger’s body continues moving in the same direction even though the bus stops.
16. What is the effect of force on a stationary object?
a) It accelerates the object
b) It makes the object move
c) It changes its shape
d) All of the mentioned
View Answer
Explanation: Force can cause a stationary object to move, change its shape, or accelerate, depending on the nature of the force applied.
17. Which of the following is an example of balanced forces?
a) A moving car speeding up
b) A book resting on a table
c) A moving car slowing down
d) A ball thrown upward
View Answer
Explanation: A book resting on a table is an example of balanced forces, where the upward normal force from the table is balanced by the downward gravitational force.
18. If the force acting on an object is doubled, what happens to its acceleration?
a) It is halved
b) It is quadrupled
c) It remains the same
d) It is doubled
View Answer
Explanation: According to Newton’s Second Law, acceleration is directly proportional to the force applied. Doubling the force doubles the acceleration.
19. What is the force of gravity on an object called?
a) Gravitational force
b) Normal force
c) Weight
d) Mass
View Answer
Explanation: The force of gravity acting on an object is called its weight. It depends on the object’s mass and the gravitational pull of the Earth.
20. What is the force of attraction between two masses called?
a) Gravitational force
b) Electromagnetic force
c) Frictional force
d) Nuclear force
View Answer
Explanation: The force of attraction between two masses is called gravitational force. This force is responsible for keeping objects on the ground and for the motion of planets and stars.
21. Who formulated the law of universal gravitation?
a) Albert Einstein
b) Galileo Galilei
c) Isaac Newton
d) Johannes Kepler
View Answer
Explanation: Isaac Newton formulated the law of universal gravitation, which states that every mass exerts an attractive force on every other mass in the universe.
22. What is the gravitational force between two objects with masses m1 and m2 separated by a distance r?
a) F = G(m1 × m2)/r2
b) F = G(m1 × m2)/r
c) F = G(m1 + m2)/r2
d) F = G(m1 × m2)2/r2
View Answer
Explanation: The gravitational force between two objects is given by the formula F = G(m1 × m2)/r2, where G is the gravitational constant, m1 and m2 are the masses, and r is the distance between them.
23. What happens to the gravitational force if the distance between two objects is halved?
a) It becomes half
b) It becomes four times
c) It remains unchanged
d) It becomes double
View Answer
Explanation: Gravitational force is inversely proportional to the square of the distance. If the distance between two objects is halved, the gravitational force becomes four times stronger.
24. Which of the following has the highest value of gravitational acceleration?
a) Mars
b) Earth
c) Jupiter
d) The Moon
View Answer
Explanation: Earth has the highest value of gravitational acceleration (approximately 9.8 m/s2) compared to other planets and moons.
25. Why do objects fall towards the Earth?
a) Due to magnetic force
b) Due to friction
c) Due to gravitational force
d) Due to air resistance
View Answer
Explanation: Objects fall towards the Earth due to the gravitational force acting between them and the Earth. This force pulls objects toward the center of the Earth.
26. Which of the following is the SI unit of weight?
a) Joule
b) Meter
c) Kilogram
d) Newton
View Answer
Explanation: The SI unit of weight is the Newton (N), which is a unit of force. Weight is the force exerted by gravity on an object.
27. Which of the following has the largest gravitational force?
a) A 100 kg object on Earth
b) A 10 kg object on the Moon
c) A 1 kg object on Earth
d) A 1,000 kg object in space
View Answer
Explanation: A 100 kg object on Earth experiences the largest gravitational force due to its mass and the Earth’s stronger gravitational pull.
28. What is the condition for work to be done by a force?
a) The force must be zero
b) There must be a displacement in the direction of the applied force
c) The object must be at rest
d) The displacement must be perpendicular to the force
View Answer
Explanation: Work is done when there is a displacement in the direction of the applied force. If there is no displacement or the displacement is perpendicular to the force, no work is done.
29. Which of the following is an example of potential energy?
a) A flowing river
b) A moving car
c) A spinning wheel
d) A book resting on a shelf
View Answer
Explanation: A book resting on a shelf has potential energy due to its position. This energy can be converted to kinetic energy if the book falls.
30. The total energy of a body is the sum of which two forms of energy?
a) Work and energy
b) Heat and work
c) Kinetic and potential energy
d) Chemical and electrical energy
View Answer
Explanation: The total energy of a body is the sum of its kinetic energy and potential energy. This is the concept of mechanical energy.
31. When a ball is thrown upward, its kinetic energy is converted into?
a) Electrical energy
b) Potential energy
c) Heat energy
d) Chemical energy
View Answer
Explanation: As the ball moves upward, its kinetic energy is converted into potential energy, which increases as the ball gains height.
32. What is the power required to do 100 J of work in 5 seconds?
a) 200 W
b) 50 W
c) 10 W
d) 20 W
View Answer
Explanation: Power is the rate at which work is done. Power = Work / Time, so Power = 100 J / 5 s = 20 W.
33. Which of the following is true about power?
a) It is the energy stored in an object
b) It is measured in Newtons
c) It is the rate at which energy is used
d) It is inversely proportional to time
View Answer
Explanation: Power is defined as the rate at which energy is used or work is done, typically measured in watts (W).
34. Which of the following is a high-power appliance?
a) Mobile phone charger
b) LED bulb
c) Refrigerator
d) Electric Iron
View Answer
Explanation: Electric irons consume high power compared to the other options, as they require significant energy to heat up and maintain high temperatures.
35. What happens to the total energy in a closed system?
a) It decreases
b) It remains constant
c) It increases
d) It becomes zero
View Answer
Explanation: In a closed system, the total energy remains constant due to the conservation of energy principle, which states that energy cannot be created or destroyed.
36. What is 1 horsepower approximately equal to?
a) 736 W
b) 1000 W
c) 746 W
d) 10 W
View Answer
Explanation: 1 horsepower is equivalent to 746 watts of power.
37. A car of mass 1000 kg is moving at a speed of 20 m/s. What is its kinetic energy?
a) 200 kJ
b) 400 kJ
c) 100 kJ
d) 300 kJ
View Answer
Explanation: Kinetic Energy = \(\frac{1}{2}mv^2 = \frac{1}{2}\) × 1000 kg × (20m/s)2 = 200,000 J = 200 kJ.
38. A 75 kg man climbs a staircase with a height of 4 m. What is the work done against gravity?
a) 300 J
b) 750 J
c) 3000 J
d) 4000 J
View Answer
Explanation: Work = mgh = 75kg × 10m/s2 × 4m = 3000 J.
39. Which of the following affects the potential energy of an object?
a) Temperature of the object
b) Shape of the object
c) Height of the object
d) Speed of the object
View Answer
Explanation: Potential energy depends on the height of the object in a gravitational field, given by the formula PE = mgh.
40. Which of the following devices converts electrical energy to mechanical energy?
a) Battery
b) Fan
c) Heater
d) Solar panel
View Answer
Explanation: A fan converts electrical energy into mechanical energy to produce motion, typically through a rotating motor.
41. Which of the following is a transverse wave?
a) Light waves
b) Sound waves in water
c) Waves in a slinky
d) Sound waves in air
View Answer
Explanation: Light waves are transverse waves as their oscillations are perpendicular to the direction of wave propagation.
42. Which of the following waves does NOT require a medium for propagation?
a) Sound
b) Seismic waves
c) Radio waves
d) Ocean waves
View Answer
Explanation: Radio waves are electromagnetic waves and do not require a medium, as they can travel through a vacuum.
43. In which medium is the speed of sound the highest?
a) Solids
b) Gases
c) Liquids
d) Vacuum
View Answer
Explanation: Sound travels fastest in solids because their particles are closely packed, allowing for quicker transmission of sound waves.
44. What is the approximate speed of sound in air at room temperature?
a) 400 m/s
b) 343 m/s
c) 330 m/s
d) 220 m/s
View Answer
Explanation: At room temperature (20°C), the speed of sound in air is approximately 343 m/s.
45. When is an echo heard?
a) When sound is absorbed
b) When the reflected sound reaches after 1/10th of a second
c) When the source of the sound is moving
d) When the sound is reflected
View Answer
Explanation: An echo occurs when the reflected sound reaches the listener at least 1/10th of a second after the original sound.
46. What is the persistence of sound due to multiple reflections called?
a) Echo
b) Diffraction
c) Reverberation
d) Refraction
View Answer
Explanation: Reverberation is the persistence of sound caused by multiple reflections from surfaces in an enclosed space.
47. What happens to sound waves when they hit a hard surface?
a) They are refracted
b) They are diffracted
c) They are absorbed
d) They are reflected
View Answer
Explanation: When sound waves hit a hard surface, they are reflected, which is why echoes are heard.
48. What principle is used in SONAR for navigation?
a) Reflection of sound
b) Diffraction of sound
c) Interference of sound
d) Refraction of sound
View Answer
Explanation: SONAR (Sound Navigation and Ranging) uses the reflection of sound waves to detect objects underwater.
49. Which of the following is an example of infrasonic sound?
a) Whale sounds
b) Earthquake tremors
c) Bat communication
d) Human speech
View Answer
Explanation: Infrasonic sounds have frequencies below 20 Hz, and earthquake tremors produce such sounds.
50. Why is the speed of sound in solids higher than in gases?
a) Particles in solids are closely packed
b) Solids are more rigid
c) Solids are more elastic
d) All of the mentioned
View Answer
Explanation: The close packing of particles, rigidity, and elasticity in solids all contribute to the higher speed of sound in solids compared to gases.
51. What is the speed of sound in steel approximately?
a) 1500 m/s
b) 343 m/s
c) 6000 m/s
d) 5000 m/s
View Answer
Explanation: Sound travels in steel at approximately 6000 m/s due to its high elasticity and close particle packing.
Explore Class 9 Physics MCQs Chapter-wise
Explore more MCQs chapter-wise below and test your understanding of each topic in greater detail:
- Motion MCQ
- Force and Laws of Motion MCQ
- Gravitation MCQ
- Work, Energy and Power MCQ
- Sound MCQ
Related Links:
Frequently Asked Questions (FAQs) About Class 9 Physics MCQs
Q1. What are Class 9 Physics MCQs?
Class 9 Physics MCQs (Multiple Choice Questions) are practice questions designed to help students prepare for their exams. These questions cover essential topics from the Class 9 Physics curriculum based on the NCERT syllabus, including motion, force, gravitation, work, and energy.
Q2. Why should I practice Class 9 Physics MCQs?
Practicing Class 9 Physics MCQs helps you strengthen your understanding of key concepts, improve problem-solving skills, and get better prepared for exams. It also enhances your ability to recall information quickly when you’re under time pressure.
Q3. Are these MCQs based on the NCERT syllabus?
Yes, the MCQs are designed in alignment with the NCERT syllabus to help students prepare for exams effectively.
Q4. How can solving MCQs help in exams?
Solving MCQs helps in:
- Quick revision of key concepts.
- Practicing time management during exams.
- Identifying and strengthening weaker areas.
Q5. Are these MCQs useful for competitive exams?
Yes, practicing these MCQs can also aid in preparation for competitive exams like NTSE, Olympiads, and school-level quizzes.
Q6. What strategies can I use to solve MCQs more effectively?
Read the question carefully, eliminate obviously wrong options, and if unsure, make a guess based on your knowledge.
Q7. Can I suggest additional topics for MCQs?
Absolutely! If there are specific subtopics or areas you want more MCQs on, feel free to suggest them.
