A piece of ice floats in a glass of water filled to brim. When ice melts, water level MCQ with Answer and Explanation

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A piece of ice floats in a glass of water filled to brim. When ice melts, water level

A. First decreases then increases

B. Remains same

C. Increases

D. Decreases

Answer: Option B

Solution (By JKExamLibrary)

Ice displaces water equal to its weight. When melted, it occupies exactly that volume. So level unchanged. Classic question.

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Question #1

The process of a solid changing directly into gas is

A. Sublimation

B. Melting

C. Evaporation

D. Condensation

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Correct Answer: Option A

Explanation:
Sublimation: solid → gas. Example: dry ice (CO₂), camphor. Deposition is reverse (gas → solid). Melting solid → liquid, evaporation liquid → gas.

This question belongs to: Science Physics

Question #2

A wire of resistance 6 Ω is stretched to thrice its original length. New resistance is

A. 2 Ω

B. 18 Ω

C. 54 Ω

D. 36 Ω

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Correct Answer: Option C

Explanation:
R ∝ L² (volume constant). L'=3L => R' = 3² × 6 = 9×6 = 54 Ω. Generally, R' = n² R for stretching n times. Important concept.

This question belongs to: Science Physics

Question #3

Electron e/m measured by:

A. Thomson

B. Rutherford

C. Bohr

D. Millikan

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Correct Answer: Option A

Explanation:
J.J. Thomson measured e/m using cathode ray deflection (1897). Millikan later measured e (oil drop). Memory aid: 'Thomson = e/m; Millikan = e'. Experimental physics history frequently tested in competitive exams.

This question belongs to: Science Physics

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