20 Important Physics MCQs with Answers | Online Physics Quiz Test

 Test your physics knowledge with this interactive set of 20 important Physics MCQs. Each question includes four options, and the correct answer is revealed instantly when you select your choice.

This quiz covers key physics topics including force, motion, gravity, electricity, waves, energy, power, lenses, and basic formulas. It is ideal for Class 8, 9, and 10 students preparing for school exams and competitive tests.

Challenge yourself and try to score 20/20!

1. What is the SI unit of force?

A) Newton

B) Joule

C) Watt

D) Pascal

2. What is the speed of light in vacuum?

A) 3 × 10⁸ m/s

B) 3 × 10⁶ m/s

C) 3 × 10⁵ m/s

D) 3 × 10⁷ m/s

3. Which device is used to measure electric current?

A) Voltmeter

B) Ammeter

C) Barometer

D) Thermometer

4. What is the unit of power?

A) Joule

B) Watt

C) Newton

D) Volt

5. Who gave the law of gravitation?

A) Isaac Newton

B) Albert Einstein

C) Galileo

D) Faraday

6. What is the SI unit of pressure?

A) Pascal

B) Newton

C) Watt

D) Joule

7. Which mirror is used as rear-view mirror?

A) Convex Mirror

B) Concave Mirror

C) Plane Mirror

D) None

8. What is the formula of velocity?

A) Distance / Time

B) Mass × Acceleration

C) Force × Distance

D) Work / Time

9. What is the unit of electric resistance?

A) Ohm

B) Volt

C) Ampere

D) Watt

10. What type of lens is used to correct myopia?

A) Concave Lens

B) Convex Lens

C) Plane Lens

D) None

11. What is the acceleration due to gravity on Earth?

A) 9.8 m/s²

B) 8.9 m/s²

C) 10.8 m/s²

D) 7.8 m/s²

12. What is the SI unit of work?

A) Joule

B) Newton

C) Watt

D) Pascal

13. Which wave does not require a medium?

A) Light Wave

B) Sound Wave

C) Water Wave

D) Mechanical Wave

14. What is the unit of frequency?

A) Hertz

B) Newton

C) Joule

D) Ohm

15. Who invented the telephone?

A) Alexander Graham Bell

B) Thomas Edison

C) Newton

D) Tesla

16. What is momentum?

A) Mass × Velocity

B) Force × Time

C) Work / Time

D) Mass / Velocity

17. What is the SI unit of voltage?

A) Volt

B) Ampere

C) Ohm

D) Watt

18. Which energy is stored in a battery?

A) Chemical Energy

B) Mechanical Energy

C) Nuclear Energy

D) Sound Energy

19. What is the unit of acceleration?

A) m/s²

B) m/s

C) km/h

D) Newton

20. Which instrument measures temperature?

A) Thermometer

B) Barometer

C) Ammeter

D) Hygrometer