A sound wave has time period 0.01 s. Its frequency is MCQ with Answer and Explanation

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A sound wave has time period 0.01 s. Its frequency is

A. 0.1 Hz

B. 100 Hz

C. 1000 Hz

D. 10 Hz

Answer: Option B

Solution (By JKExamLibrary)

f = 1/T = 1/0.01 = 100 Hz.

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A body moves along a straight line with v = 2t + 3. Acceleration after 2 s is

A. 5 m/s²

B. 7 m/s²

C. 3 m/s²

D. 2 m/s²

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Correct Answer: Option D

Explanation:
a = dv/dt = 2, constant.

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Coil center magnetic field B = μ₀NI/(2R). If N doubled, B becomes:

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C. Four times

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Correct Answer: Option D

Explanation:
B ∝ N. Double turns ⇒ double field at center. Direct proportionality from Biot-Savart law. Memory tip: 'Coil field: B ∝ NI; more turns ⇒ stronger field'. Magnetism formula frequently tested in competitive exams.

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The atmosphere exerts pressure because

A. Air is hot

B. Air is weightless

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Correct Answer: Option C

Explanation:
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