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. Which gas is commonly used in electric bulbs?

(A) Hydrogen
(B) Oxygen
(C) Nitrogen
(D) Argon

📝 Notes

✅ Correct Answer: (D) Argon

Explanation: Argon, an inert gas, is used in electric bulbs to prevent oxidation of the tungsten filament.

Published by Jyoti ⭐ 1.79K Points at 15-Jun-2026 01:35 pm in Physics

Q. The wavelength of de Broglie waves is maximum for:

(A) Electron
(B) Proton
(C) Alpha particle
(D) Neutron

📝 Notes

✅ Correct Answer: (A) Electron

Explanation: For particles with the same kinetic energy, λ ∝ 1/√m. Therefore, electrons have the maximum wavelength.

Published by Jyoti ⭐ 1.79K Points at 15-Jun-2026 01:35 pm in Physics

Q. Which of the following is not an SI base unit?

(A) Kelvin
(B) Candela
(C) Newton
(D) Mole

📝 Notes

✅ Correct Answer: (C) Newton

Explanation: Newton is a derived SI unit of force. Kelvin, candela and mole are SI base units.

Published by Jyoti ⭐ 1.79K Points at 15-Jun-2026 01:35 pm in Physics

Q. The specific heat capacity of water is approximately:

(A) 4200 J/kg·K
(B) 2100 J/kg·K
(C) 1000 J/kg·K
(D) 8400 J/kg·K

📝 Notes

✅ Correct Answer: (A) 4200 J/kg·K

Explanation: The specific heat capacity of water is about 4200 J/kg·K, one of the highest among common substances.

Published by Jyoti ⭐ 1.79K Points at 15-Jun-2026 01:35 pm in Physics

Q. The electric field due to a point charge varies as:

(A) 1/r
(B) 1/r²
(C) r
(D) r²

📝 Notes

✅ Correct Answer: (B) 1/r²

Explanation: According to Coulomb's law, electric field E = kQ/r².

Published by Jyoti ⭐ 1.79K Points at 15-Jun-2026 01:35 pm in Physics

Q. The total energy of an electron in Bohr's first orbit of hydrogen atom is:

(A) -13.6 eV
(B) -3.4 eV
(C) -1.51 eV
(D) 13.6 eV

📝 Notes

✅ Correct Answer: (A) -13.6 eV

Explanation: In the Bohr model, the total energy of an electron in the nth orbit is E = -13.6/n² eV. For n = 1, E = -13.6 eV.

Published by Jyoti ⭐ 1.79K Points at 15-Jun-2026 01:35 pm in Physics

Q. The work done by a force acting perpendicular to the displacement is:

(A) Positive
(B) Negative
(C) Zero
(D) Infinite

📝 Notes

✅ Correct Answer: (C) Zero

Explanation: Work done W = Fs cosθ. When θ = 90°, cos90° = 0, hence work done is zero.

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

Q. The SI unit of electric field intensity is:

(A) Volt
(B) N/C
(C) Ohm
(D) Coulomb

📝 Notes

✅ Correct Answer: (B) N/C

Explanation: Electric field intensity is force per unit charge, so its SI unit is Newton per Coulomb (N/C).

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

Q. The force between two point charges becomes one-fourth when:

(A) Distance is halved
(B) Distance is doubled
(C) Charge is doubled
(D) Charge is halved

📝 Notes

✅ Correct Answer: (B) Distance is doubled

Explanation: According to Coulomb's law, F ∝ 1/r². If distance is doubled, force becomes 1/4 times.

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

Q. A body moving with constant speed in a circle has:

(A) Constant velocity
(B) Zero acceleration
(C) Changing velocity
(D) Constant momentum

📝 Notes

✅ Correct Answer: (C) Changing velocity

Explanation: Even if speed remains constant, the direction of velocity changes continuously in circular motion.

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

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