Which of the following are functions of infra-red?
a) exchanging emails
b) sending command signals
c) transmitting images
d) all of these
A….is a space station that receive microwave signals from earth microwave station.
a) radio signal
b) microwave signal
c) satellite
d) none of these
Transmitting signal from ground or earth to satellite is called…….
a) up-linking
b) down-linking
c) both a & b
d) none of these
Transmitting signal from satellite to earth is called……..
a) up-linking
b) down-linking
c) both a & b
d) none of these
What is the distance of satellite from the earth?
a) 22200
b) 22300
c) 22400
d) 22500
The satellite consists of ……. that send and receive signals.
a) solar power
b) transceiver
c) both a & b
d) none of these
