Which of the following is a non-ohmic conductor? MCQ with Answer and Explanation

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Which of the following is a non-ohmic conductor?

A. Iron wire

B. Silver wire

C. Copper wire

D. Diode

Answer: Option D

Solution (By JKSSB Mock Tests)

Diode has non-linear I-V characteristic. Metals are ohmic.

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Question #1

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Assertion (A): A convex mirror is used as a rear-view mirror. Reason (R): It gives a wider field of view.

A. A false, R true

B. A true, R false

C. Both A and R true, R not correct explanation

D. Both A and R true, R correct explanation

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Correct Answer: Option D

Explanation:
Convex mirror provides wider field and erect image, so R explains A correctly.

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Question #2

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The instrument used to measure potential difference is

A. Voltmeter

B. Ammeter

C. Galvanometer

D. Ohmmeter

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Correct Answer: Option A

Explanation:
Voltmeter measures potential difference in volts. Connected in parallel. Ideal voltmeter has infinite resistance. Galvanometer can be converted to voltmeter by adding high resistance in series.

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Question #3

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Magnetic field lines inside a bar magnet go from

A. South to North

B. Depends on material

C. North to South

D. Random

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Correct Answer: Option A

Explanation:
Outside N to S, inside S to N, forming closed loops.

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