A wave of frequency 500 Hz has speed 350 m/s. Wavelength is MCQ with Answer and Explanation

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A wave of frequency 500 Hz has speed 350 m/s. Wavelength is

A. 0.7 m

B. 1.43 m

C. 175 m

D. 70 m

Answer: Option A

Solution (By JKSSB Mock Tests)

λ = v/f = 350/500 = 0.7 m.

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An object moving with uniform circular motion has

A. Constant displacement

B. Constant speed

C. Constant velocity

D. Constant acceleration

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Correct Answer: Option B

Explanation:
Speed constant, velocity and acceleration (centripetal) change direction. KE constant.

This question belongs to: Science Physics

Question #2

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The scientist who invented the electric generator is

A. Thomas Edison

B. Michael Faraday

C. James Watt

D. Nikola Tesla

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Correct Answer: Option B

Explanation:
Michael Faraday built the first electric generator (Faraday disk) in 1831, based on electromagnetic induction. Tesla contributed to AC motor and polyphase system. Edison DC systems. Watt steam engine.

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Question #3

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The focal length of a concave mirror is 15 cm. The radius of curvature is

A. 7.5 cm

B. 30 cm

C. 45 cm

D. 15 cm

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Correct Answer: Option B

Explanation:
For spherical mirrors, R = 2f. So R = 2 × 15 = 30 cm. Sign convention: for concave mirror, f and R are negative by Cartesian convention, but magnitude 30 cm. So 30 cm is correct.

This question belongs to: Science Physics

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