Means of communication

CBSE Worksheet-01

CLASS - IV EVS – Means of Communication

Answer the Following:

1. What is meant by communication?

2. What are means of communication?

3. What is telecommunication?

4. Who invented telegraph?

5. Who invented telephone?

6. Who invented radio?

7. Who invented television?

8. What is meant by channel?

9. What is the use of electric cables in communication system?

10. What are optical fibres?

11. What is telegraph?

12. What is a telephone?

CBSE Worksheet-01
CLASS - IV EVS – Means of Communication
Answers

1. Communication means sending or receiving message from one end to other.

2. Devices used to talk, or to send message one end to other, or from one person to other are called means of communication.

3. Telecommunication is communication at a distance by technological means, particularly through electrical signals

4. Charles Wheatstone and Samuel Morse

5. Alexander Graham Bell

6. Edwin Armstrong, and Lee de Forest

7. John Logie Baird and Philo Farnsworth

8. A method that people used to get information, to communicate or to send something somewhere is called channel.

9. Electric cables are used in communication systems to transmit messages.

10. Optical fibres are used in the communication systems to transmit messages.

11. It is a device that uses pulses to transmit coded messages through a wire to a receiver where the message is decoded.

12. It is a device which allows the human voice to be transmitted over distance.