Which of the following is a semiconductor? MCQ with Answer and Explanation

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Which of the following is a semiconductor?

A. Iron

B. Copper

C. Silicon

D. Silver

Answer: Option C

Solution (By JKSSB Mock Tests)

Silicon and germanium are semiconductors.

This question belongs to: Science Physics

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Question #1

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SHM acceleration a = -ω²x. Maximum acceleration occurs at:

A. Both positions

B. Extreme position

C. Mean position

D. Neither

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Correct Answer: Option B

Explanation:
a ∝ -x; magnitude maximum when |x| maximum (extremes). At mean position x=0 ⇒ a=0. Velocity maximum at mean position. Memory aid: 'SHM: a max at extremes, v max at center'. Oscillation concept frequently tested in competitive exams to verify SHM characteristics understanding.

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Question #2

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An ultrasound wave has frequency 2 MHz. Time period is

A. 2 ms

B. 0.5 μs

C. 0.5 ms

D. 2 μs

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Correct Answer: Option B

Explanation:
T = 1/(2×10⁶) = 0.5×10⁻⁶ s = 0.5 μs.

This question belongs to: Science Physics

Question #3

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Electromagnetic induction principle discovered by:

A. Oersted

B. Faraday

C. Volta

D. Ampere

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Correct Answer: Option B

Explanation:
Michael Faraday discovered electromagnetic induction (1831): changing magnetic flux induces EMF. Oersted found current-magnetism link; Ampere studied forces; Volta invented battery. Memory aid: 'Faraday = induction; Lenz = induced current direction'. History-based question testing key discoveries, frequently appearing in competitive exams.

This question belongs to: Science Physics

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