CBSE 2015, Set 3

Question

(a) What are the three basic units in communication systems? Write briefly the function of each of these.
(b) Write any three applications of the Internet used in communication systems.

Edvaya · Accepted Answer

The correct answer is Subjective. **SOLUTION** (a) ![Communication System Block Diagram](https://www.edvaya.com/img/p31.png) A communication system consists of three basic units: (i) Transmitter: This unit is used for transmitting the information after modifying it to a suitable form. It basically consists of a transducer that converts signal in any physical form to electrical signal for transmission. After that, the signal is modulated to transmit over long distances. (ii) Communication channel: This unit carries the modulated signal from the transmitter to the receiver. Transmission lines act as a communication channel in case of telephony, whereas the free space serves the purpose of communication channel in case of the radio communication. (iii) Receiver: This unit consists of an antenna, which receives the signal, followed by a demodulator, an amplifier and a transducer. The demodulator demodulates the modulated signal, the amplifier boosts up its intensity and the transducer converts it back again from electrical form to the needed physical form. (b) 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.

Edvaya Target

Edvaya Aspire

Take a Free Mock Test

Target Subjects

Aspire Subjects

Subject Mastery

Physics > Modern Physics > Electromagnetic Waves

Keep Practicing

Current Question

Community Stats

Track Your Progress

Edvaya Target

We Value Your Privacy