Physics MCQs

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Physics MCQs

📘 CHAPTER 1: SOUND

MCQs

1. Sound waves in air are

A. Transverse waves
B. Longitudinal waves
C. Electromagnetic waves
D. Standing waves

✔ Answer: B

2. The speed of sound depends mainly on

A. Amplitude
B. Frequency
C. Density and elasticity of medium
D. Loudness

✔ Answer: C

3. Unit of frequency is

A. m/s
B. rad/s
C. Hertz
D. Decibel

✔ Answer: C

4. Which property remains unchanged when sound passes from one medium to another?

A. Velocity
B. Wavelength
C. Frequency
D. Amplitude

✔ Answer: C

5. Laplace’s correction is applied because sound propagation is

A. Isothermal
B. Adiabatic
C. Isochoric
D. Isobaric

✔ Answer: B

6. Speed of sound is maximum in

A. Gases
B. Liquids
C. Solids
D. Vacuum

✔ Answer: C

7. The phenomenon responsible for echo is

A. Refraction
B. Diffraction
C. Reflection
D. Interference

✔ Answer: C

📘 CHAPTER 2: LAWS OF MOTION

MCQs

8. Newton’s First Law is also known as

A. Law of acceleration
B. Law of force
C. Law of inertia
D. Law of momentum

✔ Answer: C

9. The SI unit of force is

A. Dyne
B. Newton
C. Joule
D. Watt

✔ Answer: B

10. Newton’s Second Law relates force with

A. Velocity
B. Acceleration
C. Momentum
D. Work

✔ Answer: C

11. Action and reaction forces

A. Act on same body
B. Act in same direction
C. Are equal and opposite
D. Cancel each other

✔ Answer: C

12. In absence of external force, momentum of a system

A. Increases
B. Decreases
C. Remains constant
D. Becomes zero

✔ Answer: C

13. Rocket propulsion is based on

A. Newton’s first law
B. Newton’s second law
C. Newton’s third law
D. Law of gravitation

✔ Answer: C

📘 CHAPTER 3: MECHANICAL PROPERTIES OF SOLIDS

MCQs

14. Stress is defined as

A. Force × Area
B. Force / Area
C. Area / Force
D. Force × Strain

✔ Answer: B

15. SI unit of stress is

A. Joule
B. Newton
C. Pascal
D. Watt

✔ Answer: C

16. Strain is a

A. Vector quantity
B. Scalar quantity
C. Force
D. Pressure

✔ Answer: B

17. Hooke’s law is valid up to

A. Elastic limit
B. Yield point
C. Breaking point
D. Plastic limit

✔ Answer: A

18. Young’s modulus is the ratio of

A. Stress / Strain
B. Strain / Stress
C. Force / Area
D. Area / Force

✔ Answer: A

19. Bulk modulus is related to

A. Change in length
B. Change in volume
C. Change in shape
D. Change in area

✔ Answer: B

20. Which material has the highest Young’s modulus?

A. Rubber
B. Copper
C. Steel
D. Glass

✔ Answer: C

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