Ionosphere Mainly Consists of - Physics


Ionosphere mainly consists of _______.


  • positive ions and electrons

  • water vapour and smoke

  • ozone layer

  • dust particles



positive ions and electrons

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2014-2015 (October)



Draw a block diagram of generalized communication system.

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

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

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

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

The figure given below shows the block diagram of a generalized communication system. Identify the element labelled 'X' and write its function.

Write two basic modes of communication

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, with the help of a suitable diagram, the space wave mode of propagation. Give two examples in communication systems where this mode is used. What is the frequency range of these waves? Give reason for using this range of frequency.

Mention the function of any two of the following used

(i) Transducer

(ii) Repeater

(iii) Transmitter

(iv) Bandpass Filter

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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