The temperature coefficient of resistance of a semiconductor is MCQ with Answer and Explanation

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The temperature coefficient of resistance of a semiconductor is

A. Zero

B. Infinite

C. Positive

D. Negative

Answer: Option D

Solution (By JKSSB Mock Tests)

Resistance decreases with temperature for semiconductors, so α negative.

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Question #1

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A particle starts from rest and moves with constant acceleration. The distance covered in the first 3 seconds is 9 m. The acceleration is

A. 1 m/s²

B. 4 m/s²

C. 2 m/s²

D. 3 m/s²

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Correct Answer: Option C

Explanation:
s = ut + ½at², u=0 => 9 = ½a(3)² => 9 = ½a×9 => a = 2 m/s².

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Question #2

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Potentiometer sensitivity increased by:

A. Higher current

B. Thicker wire

C. Shorter wire

D. Longer wire

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Correct Answer: Option D

Explanation:
Longer wire ⇒ smaller potential gradient (V/cm) ⇒ finer voltage measurement ⇒ higher sensitivity. Memory tip: 'Sensitivity ∝ wire length; smaller gradient = better resolution'. Experimental physics concept frequently tested in competitive exams.

This question belongs to: Science Physics