The unit of magnetic flux is MCQ with Answer and Explanation

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The unit of magnetic flux is

A. Farad

B. Henry

C. Weber

D. Tesla

Answer: Option C

Solution (By JKSSB Mock Tests)

Weber (Wb) = T m².

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Question #1

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Which scientist is associated with the theory of relativity?

A. Albert Einstein

B. James Watt

C. Galileo Galilei

D. Isaac Newton

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Correct Answer: Option A

Explanation:
Albert Einstein proposed special relativity (1905) and general relativity (1915), revolutionized concepts of space, time, gravity. E=mc². Newton classical mechanics. Galileo telescope, falling bodies. Watt steam engine.

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Question #2

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The focal length of a concave mirror is 10 cm. Object placed at 20 cm gives image distance

A. 10 cm

B. 20 cm

C. 5 cm

D. Infinity

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Correct Answer: Option B

Explanation:
u = -20, f = -10. Mirror formula: 1/f = 1/v + 1/u => 1/(-10) = 1/v + 1/(-20) => -1/10 = 1/v - 1/20 => 1/v = -1/10 + 1/20 = -1/20 => v = -20 cm, image at C.

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Question #3

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Beats used for:

A. Instrument tuning

B. Sound speed measurement

C. Both

D. Neither

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Correct Answer: Option C

Explanation:
Beats: tune instruments (zero beat = matched frequency); measure sound speed via known frequency difference. Memory tip: 'Beats: tuning and measurement applications'. Wave phenomenon application frequently tested in competitive exams.

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