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

Question Report Error

The resistance of a conducting wire is directly proportional to its

A. Diameter

B. Cross-sectional area

C. Volume

D. Length

Answer: Option D

Solution (By JKExamLibrary)

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

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

The mass of a proton is approximately how many times the mass of an electron?

A. 1000

B. 1836

C. 10

D. 100

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Correct Answer: Option B

Explanation:
Proton mass ≈ 1.67 × 10⁻²⁷ kg, electron ≈ 9.11 × 10⁻³¹ kg, ratio ≈ 1836. Neutron slightly heavier. Atomic mass concentrated in nucleus.

This question belongs to: Science Physics

Question #2 Report Error

The centre of gravity of a uniform sphere is at

A. Outside sphere

B. Surface

C. Midpoint of radius

D. Geometric centre

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Correct Answer: Option D

Explanation:
For uniform sphere, centre of gravity is at centre.

This question belongs to: Science Physics

Question #3 Report Error

The image formed by a plane mirror is

A. Real and erect

B. Virtual and inverted

C. Virtual and erect

D. Real and inverted

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Correct Answer: Option C

Explanation:
Plane mirror forms virtual, erect, same size, laterally inverted image behind mirror. Used in periscope, looking glass. Distance behind mirror equals object distance.

This question belongs to: Science Physics

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