Electromagnetic Waves (NEET Physics): Questions 1 - 5 of 31

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Question number: 1

» Electromagnetic Waves » Electromagnetic Spectrum » Radio Waves

Assertion-Reason▾

Assertion (Ꭺ)

Radio waves can be polarized.

Reason (Ꭱ)

Sound waves in air are longitudinal in nature.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

Question number: 2

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

MCQ▾

Question

A point source of 2 watt is radiating uniformly in all direction in vacuum. Find the amplitude of electric field at a distance 2m from it-

Choices

Choice (4) Response

a.

30

b.

3×104

c.

3×102

d.

3×104

Question number: 3

» Electromagnetic Waves » Applications of Electromagnetic Waves

MCQ▾

Question

If λ ν, λ x and λ m represent the wavelength of visible light, x-rays, and microwaves respectively, then

Choices

Choice (4) Response

a.

λm>λν>λx

b.

λν>λx>λm

c.

λν>λm>λx

d.

λm>λx>λν

Question number: 4

» Electromagnetic Waves » Applications of Electromagnetic Waves

MCQ▾

Question

In an EM wave the amplitude of electric field is 10 V/m. The frequency of wave is 5 x 10 4 Hz. The wave is propagating along Z-axis. Then the average energy density of magnetic field is-

Choices

Choice (4) Response

a.

2 x 10 -8 J/m 3

b.

2.21 x 10 -8 J/m 3

c.

2.21 x 10 -10 J/m 3

d.

2 x 10 -10 J/m 3

Question number: 5

» Electromagnetic Waves » Applications of Electromagnetic Waves

MCQ▾

Question

Which of the following pairs of space and time varying E and B fields would generate a plane electromagnetic wave travelling in (-Z) direction?

Choices

Choice (4) Response

a.

E X, B Z

b.

E Y, B X

c.

E Z, B Y

d.

E X, B Y

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