Distinguish Between ‘Analog’ and ‘Digital’ Forms of Communication. - Physics


Distinguish between ‘Analog’ and ‘Digital’ forms of communication.



Analog form of communication Digital form of communication
It makes use of analog signals whose
amplitude varies continuously with time.
It makes use of digital signals whose
amplitude is of two levels, either low or high.
The retrieved message in analog communication is not an exact copy of the original message. This is because the message suffers distortions over the medium and during its detection process and is distorted.

The retrieved message in digital communication is always the exact copy of the original message and is practically free of distortion.


It can broadcast only limited number
of channels simultaneously.
It can broadcast tremendously large
number of channels simultaneously.
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2014-2015 (March) Panchkula Set 3


Draw a block diagram of generalized communication system.

Ionosphere mainly consists of _______.

Draw a neat, labelled block diagram for a generalised communication system.

Name the essential components of a communication system.

Explain briefly two commonly used applications of the ‘Internet’.

Write any three applications of the Internet used in communication systems.

Any device that converts one form of energy into another is termed as ______.

(A) amplifier

(B) transducer

(C) receiver

(D) demodulator

Draw a neat, labelled block diagram of a receiver for the detection of amplitude modulated  wave.

For efficient radiation and reception of signal with wavelength λ, the transmitting antennas would have length comparable to ______.

(A)`lambda` of frequency used

(B)`lambda/2` of frequency used

(C )`lambda/3` of frequency used

(D)`lambda/4` of frequency used

Draw the block diagram of a receiver in communication system

Explain the terms : Receiver in communication system

Write the functions of each of the following in communication system : Channel 

Which basic mode of communication is used in satellite communication?

Distinguish between a transducer and a repeater. 

What is the line of sight communication?

What type of wave propagation is used in the basic mode of communication?

Write, giving a reason, the frequency range used in this mode of communication of propagation.

Explain the basic concept of mobile telephoning.

Name the type of waves which are used for line of sight (LOS) communication. What is the range of their frequencies?

A transmitting antenna at the tope of a tower has a height of 20 m and the height of the receiving antenna is 45 m. Calculate the maximum distance between them for satisfactory communication in LOS mode. (Radius of the Earth = 6.4 × 106 m)

Explain the terms (a) Transducer and (b) Attenuation in communication system.

A transmitting antenna of height h and the receiving antenna of height 45 m are separated by a distance of 40 km for satisfactory communication in line of sight mode. Then the value of h is (given radius of the earth is 6400 km):

Which of the following is the communication channel in case of radio communication?


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