The frequency of a wave is 1000 Hz. Its time period is MCQ with Answer and Explanation

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The frequency of a wave is 1000 Hz. Its time period is

A. 1 s

B. 0.001 s

C. 0.01 s

D. 1000 s

Answer: Option B

Solution (By JKSSB Mock Tests)

T = 1/f = 1/1000 = 0.001 s = 1 ms. Millisecond. For higher frequency, period shorter.

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The speed of sound in air at 20°C is approximately

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B. 300 m/s

C. 343 m/s

D. 360 m/s

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Correct Answer: Option C

Explanation:
At 0°C ≈ 331 m/s, increases with temperature. At 20°C ≈ 343 m/s.

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Correct Answer: Option A

Explanation:
Convex lens: object within focal length (u < f) produces virtual, erect, magnified image (magnifying glass). Beyond F: real images. Memory tip: 'Convex lens: u < f ⇒ virtual image; u > f ⇒ real image'. Ray optics concept frequently tested in competitive exams to verify lens image formation rules.

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Henri Becquerel discovered natural radioactivity in 1896 from uranium salts. Marie and Pierre Curie later discovered radium and polonium. Rutherford classified alpha, beta rays. Roentgen discovered X-rays.

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