The resistance of a conducting wire is directly proportional to its MCQ with Answer and Explanation

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The resistance of a conducting wire is directly proportional to its

A. Length

B. Diameter

C. Cross-sectional area

D. Volume

Answer: Option A

Solution (By JKSSB Mock Tests)

R ∝ L, inversely proportional to A. Longer wire more resistance. Thicker wire less resistance. R = ρL/A. Resistivity ρ constant for material.

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Question #1

The process of combining two light nuclei to form a heavier nucleus is

A. Radioactive decay

B. Fission

C. Chain reaction

D. Fusion

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Correct Answer: Option D

Explanation:
Nuclear fusion: e.g., hydrogen isotopes deuterium and tritium fuse to helium, releasing energy. Powers Sun and stars. Requires high temperature (thermonuclear). Fusion reactor under development.

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Question #2

If the random error in measurement of radius of a sphere is 2%, the error in volume is

A. 2%

B. 4%

C. 8%

D. 6%

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Correct Answer: Option D

Explanation:
Volume V = (4/3)πr³. Fractional error ΔV/V = 3 Δr/r. Percentage error = 3 × 2% = 6%. Important for error analysis in competitive exams.

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Question #3

Which gas is filled in an electric bulb?

A. Oxygen

B. Carbon dioxide

C. Argon or nitrogen

D. Hydrogen

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Correct Answer: Option C

Explanation:
Inert gases like argon, nitrogen prevent filament oxidation.

This question belongs to: Science Physics

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