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

EM wave: E and B fields are:

A. Parallel to propagation

B. Perpendicular to each other and propagation

C. Parallel

D. Random

Answer: Option B

Solution (By JKExamLibrary)

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.

This question belongs to: Science Physics

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Escape velocity from a planet of mass M and radius R is v. For another planet of mass 4M and radius 2R, escape velocity is

A. 2v

B. v

C. √2 v

D. v/√2

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Correct Answer: Option C

Explanation:
v_esc ∝ √(M/R). New ∝ √(4M/2R) = √(2M/R) = √2 √(M/R) = √2 v.

This question belongs to: Science Physics

Question #2 Report Error

The rate of change of displacement is

A. Velocity

B. Acceleration

C. Speed

D. Momentum

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Correct Answer: Option A

Explanation:
Velocity = d(displacement)/dt. Speed is rate of change of distance.

This question belongs to: Science Physics

Question #3 Report Error

In modern household wiring, a 'fuse' has largely been replaced by which device that performs the same safety function but can be reset?

A. Capacitor

B. Rectifier

C. Inverter

D. MCB (Miniature Circuit Breaker)

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Correct Answer: Option D

Explanation:
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