Einstein known for: MCQ with Answer and Explanation

Einstein known for:

A. Nuclear model of atom

B. Photoelectric effect explanation

C. Electromagnetic induction

D. Discovery of electron

Answer: Option B

Solution (By JKExamLibrary)

Einstein explained photoelectric effect (1905) using light quanta (photons), earning Nobel Prize. Also developed relativity. Electron: Thomson; Nuclear atom: Rutherford; Induction: Faraday. Memory aid: 'Einstein = photons + relativity'. Key contribution frequently tested in competitive modern physics history questions.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

A 5 kg object is moving with 2 m/s. Its momentum is

A. 2.5 kg m/s

B. 0.4 kg m/s

C. 10 kg m/s

D. 7 kg m/s

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Correct Answer: Option C

Explanation:
p = m v = 5 × 2 = 10 kg m/s. Direction same as velocity. Momentum vector. Unit kg·m/s.

This question belongs to: Science Physics

Question #2 Report Error

A radioactive nucleus emits a beta particle. Its mass number

A. Increases by 1

B. Decreases by 1

C. Decreases by 2

D. Remains unchanged

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Correct Answer: Option D

Explanation:
β⁻ decay: n → p + e⁻, so A unchanged, Z increases by 1.

This question belongs to: Science Physics

Question #3 Report Error

A fuse in an electrical circuit is designed to:

A. Store electrical energy

B. Convert AC to DC

C. Increase current flow

D. Protect against overcurrent by melting

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Correct Answer: Option D

Explanation:
Fuse is a safety device with a wire that melts when current exceeds rated value, breaking the circuit and preventing damage from overcurrent/short circuits. It operates on Joule heating (I²R). Option A is opposite; C describes capacitor; D describes rectifier. Memory tip: 'Fuse = sacrificial overcurrent protector'. This practical application question tests knowledge of electrical safety devices, frequently examined in competitive exams. Always link fuse rating to circuit requirements: fuse current rating slightly above normal operating current.

This question belongs to: Science Physics

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