Electromagnetic Waves (NEET Physics): Questions 16 - 22 of 31

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Question number: 16

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

MCQ▾

Question

Electromagnetic waves travel in a medium with a speed of 2 x 10 8 m/s. The relative permeability of the medium is 1. What is the relative permittivity of the medium?

Choices

Choice (4) Response

a.

-0.25

b.

2.25

c.

3.25

d.

1.25

Question number: 17

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

Assertion-Reason▾

Assertion (Ꭺ)

The electromagnetic waves of shorter wavelength can travel longer distances on earth’s surface than those of longer wavelengths.

Reason (Ꭱ)

Shorter the wavelength, the larger is the velocity of wave propagation.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

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

c.

Both Ꭺ and Ꭱ are false

d.

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

Question number: 18

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

MCQ▾

Question

Unit of expression µ 0ϵ 0 is,

Choices

Choice (4) Response

a.

m/s

b.

s/m

c.

s 2 /m 2

d.

m 2 /s 2

Passage

Read the passage given below and answer the questions that follow:

The electron density of a layer of ionosphere at a height 150 km from the earth surface is 9 x 10 10 per m 3. For the sky wave transmission from this layer up to a range of 250 km, find

Question number: 19 (1 of 3 Based on Passage) Show Passage

» Electromagnetic Waves » Electromagnetic Spectrum » Radio Waves

MCQ▾

Question

The maximum useable frequency

Choices

Choice (4) Response

a.

4.57 x 10 9 Hz

b.

4.57 x l0 6 Hz

c.

3.17 x l0 6 Hz

d.

3.17 x 10 8 Hz

Question number: 20 (2 of 3 Based on Passage) Show Passage

» Electromagnetic Waves » Electromagnetic Spectrum » Radio Waves

MCQ▾

Question

The critical frequency of the layer

Choices

Choice (4) Response

a.

2.7 x 10 6 Hz

b.

4.7x 10 6 Hz

c.

2.7 x 10 5 Hz

d.

4.8 x 10 5 Hz

Question number: 21 (3 of 3 Based on Passage) Show Passage

» Electromagnetic Waves » Electromagnetic Spectrum » Radio Waves

MCQ▾

Question

The angle of incidence of this layer

Choices

Choice (4) Response

a.

34.5°

b.

25.2°

c.

31.6°

d.

40°

Question number: 22

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

MCQ▾

Question

Which of the following are electromagnetic waves?

(1) Cosmic rays (2) Gamma rays

(3) X-rays (4) β-rays

Select the correct answers and mark it according to the following codes:

Codes:

Choices

Choice (4) Response

a.

1 and 2 are correct

b.

1 and 3 are correct

c.

1, 2 and 3 are correct

d.

2 and 4 are correct

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