Communication System (NEET Physics): Questions 12 - 17 of 42

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Question number: 12

» Communication System » Amplitude and Frequency Modulation

MCQ▾

Question

If f a and f f represent the carrier wave frequencies for amplitude and frequency modulations respectively, then

Choices

Choice (4) Response

a.

faff

b.

fa=ff

c.

fa<ff

d.

fa>ff

Question number: 13

» Communication System » Basic Elements of Communication System

MCQ▾

Question

If μ 1 and μ 2 are two refractive indices of the materials of core and cladding of an optical fiber, then the loss of light due to its leakage can be minimized by having

Choices

Choice (4) Response

a.

μ 1 = μ 2

b.

μ 1 < μ 2

c.

μ 1 > μ 2

d.

Question does not provide sufficient data or is vague

Question number: 14

» Communication System » Basic Elements of Communication System

MCQ▾

Question

A laser beam is used for carrying out surgery because it

Choices

Choice (4) Response

a.

Is highly directional

b.

Is highly monochromatic

c.

Can be sharply focused

d.

Is highly coherent

Question number: 15

» Communication System » Bandwidth of Transmission Medium

MCQ▾

Question

Audio signal cannot be transmitted because

Choices

Choice (4) Response

a.

The signal cannot be amplified for distance communication

b.

The signal has more noise

c.

The transmitting antenna length is very large and impracticable

d.

The transmitting antenna length is very small to design

Question number: 16

» Communication System » Propagation of Electromagnetic Waves in the Atmosphere

MCQ▾

Question

In short wave communication which of the following frequencies will be reflected back by the ionosphere layer, having electron density 5 ⨯ 10 9 per m 3.

Choices

Choice (4) Response

a.

0.18 MHz

b.

0.14 MHz

c.

0.28 MHz

d.

0.63 MHz

Question number: 17

» Communication System » Basic Elements of Communication System

MCQ▾

Question

Laser beams are used to measure long distances because

Choices

Choice (4) Response

a.

They have high degree of parallelism

b.

They are highly polarised

c.

They are coherent

d.

They are monochromatic

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