Answer briefly:
(1) What are communication devices?
Ans. The devices which
help us to communicate are known as communication devices. Eg : Mobile,
Computer.
(2)Which are the sources of information?.
Ans. The sources of
information are Printing press, Xerox Machine, Fax Machine, Post Office, radio
and television.
(3)Explain the following:
(i) E- Mail :
Electronic mail is used for sending, receiving and writing messages through
internet.
(ii) Teleconferencing:
Teleconferencing is uses telephone lines to connect two or more computers and
modem, for holding a meeting between
people in remote areas or workplaces.