Write Any Three Applications of the Internet Used in Communication Systems. - Physics


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



 Internet is used for many purposes like searching and viewing information on any topic of interest, for sending electronic mails (e-mails), for e-banking, e-shopping (e-commerce), e-booking (e-ticketing), etc. The list of uses of Internet is endless.

(i) E-banking: It is an electronic payment system that enables customers of a financial institution (usually a bank) to proceed for financial transactions on a website operated by that institution. To bank online with an institution, it is required that the customer is a member of that institution and has the access of Internet.

(ii) Internet surfing: Navigation over World Wide Web (www) from one webpage/website to another is called Internet surfing. It is an interesting way of searching and viewing information on any topic of interest.

(iii) E-shopping (E-commerce): It is a form of electronic commerce, by which the consumers can buy the products or the services over Internet. Buying the products through product-selling websites is called e-shopping.

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2014-2015 (March) All India Set 2


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’.

What are the three basic units in communication systems ? Write briefly the function of each of these.

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.

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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