Communication System (NEET Physics): Questions 36 - 40 of 42

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Question number: 36

» Communication System » Amplitude and Frequency Modulation

MCQ▾

Question

In an FM system a 7 kHz signal modulates 108 MHz carrier so that frequency deviation is 50 kHz. The carrier swing is

Choices

Choice (4) Response

a.

0.71

b.

8

c.

7.143

d.

350

Question number: 37

» Communication System » Basic Elements of Communication System

Assertion-Reason▾

Assertion (Ꭺ)

A dish antenna is highly directional.

Reason (Ꭱ)

This is because a dipole antenna is omnidirectional.

Choices

Choice (4) Response

a.

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

b.

Ꭺ is false but Ꭱ is true

c.

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

d.

Ꭺ is true but Ꭱ is false

Question number: 38

» Communication System » Need for Modulation

MCQ▾

Question

The process of superimposing signal frequency (i. e. audio wave) on the carrier wave is known as,

Choices

Choice (4) Response

a.

Modulation

b.

Detection

c.

Reception

d.

Transmission

Question number: 39

» Communication System » Propagation of Electromagnetic Waves in the Atmosphere

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.

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

b.

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

c.

Ꭺ is false but Ꭱ is true

d.

Ꭺ is true but Ꭱ is false

Question number: 40

» Communication System » Amplitude and Frequency Modulation

MCQ▾

Question

In an amplitude modulated wave for audio frequency of 1000 cycle/second, the appropriate carrier frequency will be,

Choices

Choice (4) Response

a.

100 cycles/sec

b.

10 cycles/sec

c.

1000 cycles/sec

d.

10000 cycles/sec

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