Communication System Test

Result

Communication System Test - 34

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Weekly Quiz Competition

Question 1
4 / -1

Broadcasting antennas are generally

A
Omnidirectional type

B
Vertical type

C
Horizontal type

D
None of these
Question 2
4 / -1

For television broadcasting, the frequency employed is normally

A
30-300 MHz

B
30-300 GHz

C
30-300 kHz

D
30-300 Hz
Question 3
4 / -1

The radio waves of frequency 300 MHz to 3000 MHz belong to

A
High Frequency band

B
Very high frequency band

C
Ultra high frequency band

D
Super high frequency band
Question 4
4 / -1

An antenna behaves as resonant circuit only when its length is

A

B

C
λ

D
λ/2 or integral multiple of λ /2
Question 5
4 / -1

Maximum usable frequency (MUF) in F-region layer is x, when the critical frequency is 60 MHz and the angleof incidence is 70°. Then x is

A
150 MHz

B
170 MHz

C
175 MHz

D
190 MHz

Solution
Question 6
4 / -1

The electromagnetic waves of frequency 2 MHz to 30 MHz are used

A
In ground wave propagation

B
in sky wave propagation

C
in microwave propagation

D
In satellite communication
Question 7
4 / -1

A laser is a coherent source because it contains

A
Many wavelengths

B
Uncoordinated wave of a particular wavelength

C
Co-ordinated wave of many wavelengths

D
Co-ordinated waves of a particular wavelength
Question 8
4 / -1

The attenuation in optical fibre is mainly due to

A
Absorption

B
Scattering

C
Neither absorption nor scattering

D
Both (a) and (b)
Question 9
4 / -1

The maximum distance upto which TV transmission from a TV tower of height h can be received is proportional to

A
h^1/2

B
h

C
h^3/2

D
h²

Solution
Question 10
4 / -1

A laser beam is used for carrying out surgery because it

A
Is highly monochromatic

B
Is highly coherent

C
Is highly directional

D
Can be sharply focused