The principle of a lightning conductor is MCQ with Answer and Explanation

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The principle of a lightning conductor is

A. Corona discharge

B. Photoelectric effect

C. Mutual induction

D. Electromagnetic induction

Answer: Option A

Solution (By JKSSB Mock Tests)

Lightning rod uses sharp point to facilitate corona discharge, neutralizing charge to prevent lightning strike.

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Question #1

An object is placed at the centre of curvature of a concave mirror. The image formed is

A. Real, inverted, same size

B. Virtual, erect, magnified

C. Virtual, inverted, same size

D. Real, inverted, diminished

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Correct Answer: Option A

Explanation:
At C (centre of curvature), image is at C, real, inverted, same size. At F, image at infinity. Beyond C, between F and C, diminished. Object between F and C gives beyond C, enlarged.

This question belongs to: Science Physics

Question #2

The phenomenon of superconductivity is characterized by:

A. Zero magnetic permeability

B. High thermal conductivity

C. Infinite electrical resistance

D. Zero electrical resistance below critical temperature

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Correct Answer: Option D

Explanation:
Superconductivity occurs in certain materials below a critical temperature T_c, where electrical resistance drops abruptly to zero, and magnetic fields are expelled (Meissner effect). Option B describes insulators; C and D are unrelated. Memory aid: 'Superconductor: R=0 below T_c; perfect diamagnetism'. This modern physics concept is frequently tested in competitive exams. Always distinguish superconductivity (zero resistance) from perfect conductivity (theoretical limit); real superconductors exhibit Meissner effect, a defining property.

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Question #3

The efficiency of an ideal Carnot engine operating between two temperatures T1 (source) and T2 (sink) is given by:

A. (T1 - T2) / T2

B. 1 - (T2/T1)

C. 1 - (T1/T2)

D. T2 / (T1 - T2)

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Correct Answer: Option B

Explanation:
The thermal efficiency (η) of a reversible Carnot engine depends exclusively on the absolute temperatures of the hot source (T1) and the cold sink (T2). The formula is η = 1 - (T2/T1), or (T1 - T2) / T1. Temperatures must be in Kelvin. It shows no engine can be 100% efficient unless the sink is at absolute zero.

This question belongs to: Science Physics

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