EM wave: E and B fields are: MCQ with Answer and Explanation

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EM wave: E and B fields are:

A. Perpendicular to each other and propagation

B. Parallel to propagation

C. Random

D. Parallel

Answer: Option A

Solution (By JKSSB Mock Tests)

EM waves transverse: E ⊥ B ⊥ propagation direction. Derived from Maxwell's equations. Memory tip: 'EM wave: right-hand rule for E×B direction'. Wave property frequently tested in competitive modern physics sections.

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Question #1

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The splitting of white light into its constituent colors by a prism is due to

A. Reflection

B. Dispersion

C. Total internal reflection

D. Scattering

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Correct Answer: Option B

Explanation:
Dispersion: different wavelengths refract at different angles because refractive index varies with wavelength.

This question belongs to: Science Physics

Question #2

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A radioactive substance has half-life of 10 days. Fraction remaining after 30 days is

A. 1/16

B. 1/8

C. 1/4

D. 1/2

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Correct Answer: Option B

Explanation:
Number of half-lives = 30/10 = 3. Remaining = (1/2)³ = 1/8. Exponential decay N = N₀(1/2)^(t/T). Radioactive decay constant λ = ln2/T.

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Question #3

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A metal spoon placed in a hot cup of tea gets hot due to

A. Convection

B. Evaporation

C. Conduction

D. Radiation

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Correct Answer: Option C

Explanation:
Heat travels through spoon from hot end to cold end by conduction (molecular vibration and free electrons). Handle gets hot. Metal good conductor.

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