Which is the cheapest means of postal communication?
Inland letter
Post card
Aerogramme
Envelope
Which was the first device to send messages by electricity?
News paper
Radio
Telegram
TV
Which is the fastest means of communication?
Telephone
What helps us to send letters to all places?
Post office
Police station
School
Which is the oldest and cheapest means of communication?
E-mail
Sending letter
SMS
What is an important part of communication media?
Books
Mobile phones
Television
