The electromagnetic waves with highest frequency are MCQ with Answer and Explanation

Question Report Error

The electromagnetic waves with highest frequency are

A. Radio waves

B. Ultraviolet

C. Gamma rays

D. X-rays

Answer: Option C

Solution (By JKExamLibrary)

Gamma rays >10¹⁹ Hz, highest.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

The device which converts mechanical energy into electrical energy is

A. Transformer

B. Motor

C. Generator

D. Rectifier

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Correct Answer: Option C

Explanation:
Generator uses electromagnetic induction to produce electricity from mechanical motion.

This question belongs to: Science Physics

Question #2 Report Error

The function of a fuse in a domestic circuit is to

A. Protect against short circuit and overload

B. Increase power factor

C. Regulate voltage

D. Reduce current

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Correct Answer: Option A

Explanation:
Fuse is a safety device: thin wire melts when current exceeds safe limit due to short circuit or overload, breaking circuit. Prevents fire and appliance damage. Based on heating effect. MCB is modern alternative.

This question belongs to: Science Physics

Question #3 Report Error

The least count of a screw gauge is 0.001 cm. The reading of a measurement is 0.250 cm. How many significant figures does it have?

A. 4

B. 1

C. 2

D. 3

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Correct Answer: Option D

Explanation:
Reading 0.250 cm has three significant figures (2,5, and trailing zero after decimal). Least count gives precision, trailing zero indicates measurement to 0.001 cm, so it's significant.

This question belongs to: Science Physics

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