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

The principle of a lightning conductor is
A. Photoelectric effect
B. Corona discharge
C. Mutual induction
D. Electromagnetic induction
Answer: Option B
Solution (By JKSSB Mock Tests)
Lightning rod uses sharp point to facilitate corona discharge, neutralizing charge to prevent lightning strike.

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Practice More Physics Questions

Question #1
The specific resistance (resistivity) of a metallic conductor depends exclusively upon its:
A. Cross-sectional area
B. Volume
C. Nature of material and temperature
D. Length

Correct Answer: Option C


Explanation:
Resistance depends on length and area (R = rho * L / A), but specific resistance or resistivity (rho) is an intrinsic property of the material itself. It does not depend on the geometric dimensions of the conductor (length, area, volume). Resistivity strictly depends on the atomic structure (nature of the material) and the thermal vibrations (temperature of the material).

This question belongs to: Science Physics
Question #2
Newton's second law gives the measure of
A. Inertia
B. Force
C. Momentum
D. Energy

Correct Answer: Option B


Explanation:
F = ma, defines force quantitatively. First law inertia, third action-reaction.

This question belongs to: Science Physics
Question #3
The physical quantity having unit henry is
A. Conductance
B. Capacitance
C. Resistance
D. Inductance

Correct Answer: Option D


Explanation:
Henry (H) = V·s/A = Ω·s.

This question belongs to: Science Physics