COMEDK-UGET SERIES Physics
Communication Systems
7 previous year questions.
Volume: 7 Ques
Yield: Medium
High-Yield Trend
2
2021 2
2015 2
2014 1
2012 Chapter Questions 7 MCQs
01
PYQ 2012
medium
physics ID: comedk-u
The layer in earth's atmosphere which reflects radio waves from the earth thus, helping radio communication is
1
Stratosphere
2
Mesosphere
3
Troposphere
4
Ionosphere
02
PYQ 2014
medium
physics ID: comedk-u
The signals have a bandwidth of . The number of channels that can be accommodated with a band of is
1
2
3
4
03
PYQ 2014
medium
physics ID: comedk-u
The increase in the height of the tower of height to get its coverage range tripled is
1
800 m
2
1600 m
3
900 m
4
700 m
04
PYQ 2015
medium
physics ID: comedk-u
The wireless communication frequency bands for Cellular Mobile Radio (mobile to base station) are in range of
1
76-88 MHz
2
900-1000 MHz
3
896-901 MHz
4
896-1000 MHz
05
PYQ 2015
easy
physics ID: comedk-u
A message signal of frequency and peak value of is used to moderate a carrier of frequency and peak voltage . The modulation index and side bands produced are
1
and ,
2
and ,
3
and ,
4
and ,
06
PYQ 2021
medium
physics ID: comedk-u
An optical fibre communication system works on a wavelength of . The number of subscribers it can feed, if a channel requires 20 kHz, are:
1
2
3
4
None of these
07
PYQ 2021
medium
physics ID: comedk-u
In a detector, the output circuit consists of and . The frequency of carrier signal it can detect is:
1
2
0.1 kHz
3
4