PHYSICS QUIZ (COMMUNICATION SYSTEMS)

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A number of quizzes on various topics in class 11 and class 12 Physics have already been posted in the sight.

Here is another quiz PHYSICS QUIZ (COMMUNICATION SYSTEMS) for you.

PHYSICS QUIZ (COMMUNICATION SYSTEMS)

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PHYSICS QUIZ (COMMUNICATION SYSTEMS)

PHYSICS QUIZ (COMMUNICATION SYSTEMS)

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Question 1

A T.V. tower has a height 100 m. In order to double the coverage range, the height has to be increased by

A	300 m.
B	200 m.
C	100 m.
D	400 m.

Question 2

For an amplitude modulated wave, the maximum and the minimum amplitude are found to be 9V and 3V. The modulation index is

A	75%
B	50% Hint: μ = {A(max) + A(min)}/{A(max) - A(min)}
C	25%
D	100%

Question 3

In a frequency modulated wave

A	the amplitude of modulated wave varies as frequency of carrier wave.
B	The amplitude of modulated wave varies as amplitude of carrier wave.
C	the frequency of modulated wave varies as amplitude of modulating wave.
D	the frequency of modulated wave varies as frequency of modulating wave.

Question 4

The range of frequencies allocated to commercial FM radio broadcast is

A	8 to 88 MHz
B	88 to 108 KHz
C	88 to 108 MHz
D	88 to 108 GHz

Question 5

In satellite communication different uplink and downlink frequencies are used to prevent signal

A	demodulation.
B	modulation.
C	overlapping.
D	interference.

Question 6

The mode of communication which can be used to send radio waves from one planet to another is

A	only Space wave Propagation
B	only Ground wave Propagation
C	Sky/space/ground wave propagation.
D	only Sky wave Propagation

Question 7

A TV tower has height of 100m. How much population is covered by the TV broadcast if the average population density around the tower is 1000/km². Use radius of earth=6370 km.

A	4 lakh
B	40,000
C	4 billion
D	40 lakh Hint: d=√(2hR) Population covered=πd² × population density =3.14×2hR×1000 =3.14×2×(100/1000)×6370x1000 =40 lakhs.

Question 8

If the highest modulating frequency of the wave is 5kHz, the number of radio stations that can be accommodated in a 150kHz band width are

A	10
B	5
C	15 Hint: For audio signal, bandwidth=2× maximum frequency of modulating signal Band width = 2×5 kHz=10 kHz Number of stations=Total B.W / B.W. for each station =150 kHz /10kHz =15.
D	20

Question 9

If a radio receiver amplifies all the frequencies in a signal equally well, it is said to have high

A	fidelity.
B	sensitivity.
C	distortion.
D	sensibility.

Question 10

In communication; if height of a TV tower is doubled, the range changes from 'r' to

A	5r
B	3r
C	4r
D	√2r Hint: Range of TV tower =r=√(2hR), h=height of antenna, R=radius of earth If h is doubled, New range r'=√(2x2 hR) √2 ×√(2hR)=√2(r).

Question 11

A message signal of frequency of 3 KHz has to be transmitted by AM mode. The frequency suitable for use as a carrier frequency radio wave is

A	3 MHz
B	300 GHz
C	3000 Hz
D	30 Hz

Question 12

The maximum distance up to which T.V. transmission from a tower of height h can be received is Proportional to

A	h²
B	h½
C	h¾
D	h³

Question 13

The process of super imposing signal frequency on the carrier wave is known as

A	reception.
B	transmission.
C	modulation.
D	demodulation

Question 14

An antenna can transmit radiations more effectively if the signal has

A	high frequency.
B	small amplitude.
C	low frequency.
D	long wavelength.

Question 15

Device which transform one form of energy to another form is called

A	Transponder
B	Transducer
C	Transformer
D	Transistor

Question 16

Which one of the following rays is not used in communication?

A	Micro waves
B	β-rays Hint: They are a stream of electrons
C	heat waves
D	Radio waves

Question 17

A transmitting antenna fixed the top of a tower has a height of 50m. If the height of the receiving antenna is 32m, the maximum distance between them for satisfactory communication using line of sight mode is: ( Given radius of earth R is 6400 km)

A	45.5 km
B	25.29 km
C	91 km.
D	20.23×10^3 km

Question 18

Communication on ground is through electromagnetic waves of wavelength

A	between 10^(-3)m and 0.1m.
B	> 600 m
C
D	between 200m and 600 m

Question 19

A T.V tower with a height of 150m covers a population of 50 lakh. The population density around the T.V tower is: (Given radius of earth=6.4× 10^6 m)

A	800.6/sq. km
B	828.6/sq. km
C	876.6/sq. km
D	82.6/sq. km

Question 20

The link between the transmitter and receiver is:

A	Communication Channel
B	Microphone
C	receiver
D	transducer.

Question 21

The minimum length of the antenna capable of emitting audio signal of wave length λ is

A	λ
B	λ/8
C	λ/4
D	λ/2

Question 22

An audio signal e=20 sin 2000 πt V modulates a carries wave E=80 sin 2000 00 πt V. The modulation index is

A	25%
B	400%
C	40%
D	0.25%

Question 23

A radio reciever can tune to any station in the 7.5 MHz to 30 MHz band. The corresponding wave length band is

A	2.5m - 4.0m
B	10m - 40m
C	25m - 40m
D	7.5 m - 30 m.

Question 24

The radio waves can be transmitted from one place to another using

A	ground/sky/space wave propagation.
B	space wave propagation.
C	sky wave propagation.
D	ground wave propagation.

Question 25

In radio and television broadcast, the original message signal is always in the form of

A	neither analog nor digital signal
B	analog signal
C	digital signal
D	Both analog and digit signals

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PHYSICS QUIZ (COMMUNICATION SYSTEMS)

PHYSICS QUIZ (COMMUNICATION SYSTEMS)

PHYSICS QUIZ (COMMUNICATION SYSTEMS)

PHYSICS QUIZ (COMMUNICATION SYSTEMS)

SINCERE BEST WISHES!

PHYSICS QUIZ (COMMUNICATION SYSTEMS)

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