16.
Fiber optics posses following properties __________
a) Immune electromagnetic interference
b) Very less signal attenuation
c) Very hard to tap
d) All of the mentioned
17.
Radio channels are attractive medium because __________
a) Can penetrate walls
b) Connectivity can be given to mobile user
c) Can carry signals for long distance
d) All of the mentioned
18.
Geostationary satellites ___________
a) Are placed at a fixed point above the earth
b) Rotate the earth about a fixed axis
c) Rotate the earth about a varying axis
d) All of the mentioned
19.
First network ARPANET came into existence in the year
a) 1979
b) 1969
c) 1959
d) 1949
20.
The communication protocol used by internet is
a) HTTP
b) SMTP
c) TCP/IP
d) VOiP
