The unit of resistivity is MCQ with Answer and Explanation

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The unit of resistivity is

A. Ohm metre

B. Siemens

C. Ohm per metre

D. Henry

Answer: Option A

Solution (By JKSSB Mock Tests)

ρ = R A / L, unit Ω m.

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Question #1

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The phenomenon of electromagnetic induction was discovered by:

A. Nikola Tesla

B. Heinrich Hertz

C. Thomas Edison

D. Michael Faraday

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Correct Answer: Option D

Explanation:
Michael Faraday discovered electromagnetic induction in 1831. He demonstrated that a changing magnetic field could induce an electric current in a nearby circuit. This groundbreaking discovery laid the foundation for all modern electric generators and transformers. Tesla contributed to AC systems, Edison to DC systems, and Hertz proved the existence of radio waves.

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Question #2

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The atomic number of an element is equal to the number of

A. Protons

B. Nucleons

C. Neutrons

D. Electrons in nucleus

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Correct Answer: Option A

Explanation:
Atomic number Z = number of protons (and electrons in neutral atom). Mass number = protons+neutrons.

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Question #3

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Which of the following is not a transverse wave?

A. Radio wave

B. Wave on a string

C. Sound wave in air

D. Light wave

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Correct Answer: Option C

Explanation:
Sound in air is longitudinal. Light, radio are EM waves, transverse. Wave on string transverse. Water waves combine transverse and longitudinal.

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