Electromagnetic Waves-Electromagnetic Spectrum (NEET Physics): Questions 1 - 7 of 9

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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 Spectrum » X-Rays

MCQ▾

Question

If λ = 10 Å, then it correspond to

Choices

Choice (4) Response

a.

X-rays

b.

Infrared waves

c.

Microwaves

d.

Ultraviolet waves

Question number: 3

» Electromagnetic Waves » Electromagnetic Spectrum » Ultraviolet

Assertion-Reason▾

Assertion (Ꭺ)

Ultraviolet radiations are of higher frequency waves and are dangerous to human being.

Reason (Ꭱ)

Ultraviolet radiations are absorbed by the atmosphere.

Choices

Choice (4) Response

a.

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

b.

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

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is true but Ꭱ is false

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: 4 (1 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: 5 (2 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: 6 (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: 7

» Electromagnetic Waves » Electromagnetic Spectrum » Visible

MCQ▾

Question

The range of wavelength of the visible light is

Choices

Choice (4) Response

a.

4, 000 Å to 8, 000 Å

b.

8, 000 Å to 10, 000 Å

c.

10 Å to 100 Å

d.

10, 000 Å to 15000 Å

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