# 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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