The uncertainty principle was proposed by MCQ with Answer and Explanation

Question Report Error

The uncertainty principle was proposed by

A. Schrödinger

B. Bohr

C. Planck

D. Heisenberg

Answer: Option D

Solution (By JKExamLibrary)

Heisenberg's uncertainty principle: Δx·Δp ≥ h/4π.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

An ultrasound wave has frequency 2 MHz. Time period is

A. 0.5 μs

B. 2 ms

C. 0.5 ms

D. 2 μs

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Correct Answer: Option A

Explanation:
T = 1/(2×10⁶) = 0.5×10⁻⁶ s = 0.5 μs.

This question belongs to: Science Physics

Question #2 Report Error

Bohr radius r_n ∝

A. n

B. 1/n

C. 1/n²

D. n²

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Correct Answer: Option D

Explanation:
Bohr model: r_n = n²a₀ ⇒ r ∝ n². Higher n = larger orbit. Memory tip: 'Bohr: r ∝ n²; E ∝ -1/n²'. Atomic physics relation frequently tested in competitive exams.

This question belongs to: Science Physics

Question #3 Report Error

Momentum conservation follows from:

A. Newton's first law

B. Newton's second law

C. Newton's third law

D. Energy conservation

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Correct Answer: Option C

Explanation:
Internal forces cancel in pairs (third law), so net external force = 0 ⇒ dp/dt = 0 (second law) ⇒ momentum constant. Memory aid: 'Momentum conservation ⇔ no external force ⇔ action-reaction pairs'. Mechanics foundation frequently tested in competitive exams.

This question belongs to: Science Physics

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