Physics MCQ Questions with answers

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Here Important Physics MCQ questions are added which are frequently asked in almost all the examinations. You can check the correct answer of any question on clicking the show answer button. The Correct answer will be displayed below. You can share any question with your friends on whatsapp by tapping Share button.

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Q. The SI unit of momentum is:

(A) kg·m/s
(B) N·m
(C) J·s
(D) kg/m

📝 Notes

✅ Correct Answer: (A) kg·m/s

Explanation: Momentum p = mv, hence its SI unit is kg·m/s.

Published by Jyoti ⭐ 1.79K Points at 15-Jun-2026 01:37 pm in Physics

Q. Which mirror is used by dentists to examine teeth?

(A) Plane mirror
(B) Convex mirror
(C) Concave mirror
(D) Cylindrical mirror

📝 Notes

✅ Correct Answer: (C) Concave mirror

Explanation: A concave mirror forms a magnified, erect image when the object is placed within its focal length.

Published by Jyoti ⭐ 1.79K Points at 15-Jun-2026 01:37 pm in Physics

Q. The dimensions of velocity are:

(A) [LT⁻¹]
(B) [LT]
(C) [MLT⁻¹]
(D) [ML²T⁻²]

📝 Notes

✅ Correct Answer: (A) [LT⁻¹]

Explanation: Velocity = Displacement / Time, therefore its dimensions are [LT⁻¹].

Published by Jyoti ⭐ 1.79K Points at 15-Jun-2026 01:37 pm in Physics

Q. Which of the following has zero rest mass?

(A) Electron
(B) Proton
(C) Photon
(D) Neutron

📝 Notes

✅ Correct Answer: (C) Photon

Explanation: Photons are massless particles that travel at the speed of light in vacuum.

Published by Jyoti ⭐ 1.79K Points at 15-Jun-2026 01:37 pm in Physics

Q. The SI unit of pressure is:

(A) Newton
(B) Pascal
(C) Joule
(D) Watt

📝 Notes

✅ Correct Answer: (B) Pascal

Explanation: Pressure is force per unit area and its SI unit is Pascal (Pa).

Published by Jyoti ⭐ 1.79K Points at 15-Jun-2026 01:37 pm in Physics

Q. The current in a circuit is 2 A. The charge flowing in 5 s is:

(A) 2 C
(B) 5 C
(C) 10 C
(D) 20 C

📝 Notes

✅ Correct Answer: (C) 10 C

Explanation: Charge Q = It = 2 × 5 = 10 C.

Published by Jyoti ⭐ 1.79K Points at 15-Jun-2026 01:37 pm in Physics

Q. The dimensions of acceleration are:

(A) [LT⁻¹]
(B) [LT⁻²]
(C) [MLT⁻²]
(D) [ML²T⁻²]

📝 Notes

✅ Correct Answer: (B) [LT⁻²]

Explanation: Acceleration = Velocity / Time = [LT⁻¹]/[T] = [LT⁻²].

Published by Jyoti ⭐ 1.79K Points at 15-Jun-2026 01:37 pm in Physics

Q. The phenomenon responsible for the formation of rainbow is:

(A) Reflection only
(B) Refraction only
(C) Dispersion and total internal reflection
(D) Diffraction

📝 Notes

✅ Correct Answer: (C) Dispersion and total internal reflection

Explanation: Rainbow is formed due to dispersion, refraction and total internal reflection of sunlight by water droplets.

Published by Jyoti ⭐ 1.79K Points at 15-Jun-2026 01:37 pm in Physics

Q. The SI unit of electric resistance is:

(A) Volt
(B) Ampere
(C) Ohm
(D) Farad

📝 Notes

✅ Correct Answer: (C) Ohm

Explanation: Electrical resistance is measured in ohms (Ω).

Published by Jyoti ⭐ 1.79K Points at 15-Jun-2026 01:37 pm in Physics

Q. The speed of light in vacuum is:

(A) 3 × 10⁶ m/s
(B) 3 × 10⁷ m/s
(C) 3 × 10⁸ m/s
(D) 3 × 10⁹ m/s

📝 Notes

✅ Correct Answer: (C) 3 × 10⁸ m/s

Explanation: The speed of light in vacuum is approximately 3 × 10⁸ m/s.

Published by Jyoti ⭐ 1.79K Points at 15-Jun-2026 01:37 pm in Physics

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