Radioactivity was discovered by MCQ with Answer and Explanation

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Radioactivity was discovered by

A. Becquerel

B. Rutherford

C. Curie

D. Roentgen

Answer: Option A

Solution (By JKSSB Mock Tests)

Henri Becquerel discovered natural radioactivity in uranium salts (1896). Curie isolated radium, Rutherford classified rays.

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Practice More Physics Questions

Question #1

Myopia correction uses:

A. Bifocal lens

B. Concave lens

C. Convex lens

D. Cylindrical lens

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Correct Answer: Option B

Explanation:
Myopia (nearsightedness): far point reduced; corrected by concave (diverging) lens to shift image to retina. Hypermetropia uses convex lens. Memory tip: 'Myopia = near-sighted ⇒ concave lens; Hyper = far-sighted ⇒ convex'. Vision defect correction frequently tested in competitive exams to assess application knowledge.

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Question #2

A 40 W tube light consumes _____ energy in 8 hours.

A. 5 kWh

B. 0.32 kWh

C. 320 kWh

D. 0.04 kWh

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Correct Answer: Option B

Explanation:
Energy = 0.04 kW × 8 h = 0.32 kWh.

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Question #3

de Broglie wavelength λ = h/p. For electron, λ ∝:

A. v

B. 1/v

C. v²

D. 1/v²

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Correct Answer: Option B

Explanation:
p = mv ⇒ λ = h/(mv) ⇒ λ ∝ 1/v for constant mass. Higher velocity ⇒ shorter wavelength. Memory tip: 'λ = h/mv; faster particle ⇒ smaller wavelength'. Quantum mechanics relation frequently tested in competitive modern physics sections.

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