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Free tnpsc model questions Online Test - MeritNotes
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No. of Questions :10
Remaining Time :
1. Modulation is a process of superimposing audio signal with
(a)
high frequency waves
(b)
low frequency waves
(c)
medium frequency waves
(d)
voice frequency waves
2. The frequency range of Extreme Low Frequencies (ELF) is
(a)
3-30 GHz
(b)
3-30 kHz
(c)
30-300 Hz
(d)
300-3000 Hz
3. A satellite in space links many earth stations. The user is connected to the earth station through
(a)
terrestrial network
(b)
de-emphasis network
(c)
special network
(d)
pre-emphasis network
4. _____ has made communication still more widespread with an increasing emphasis on computer and other data communication.
(a)
Electronic valves and transistors
(b)
Satellites and fibre optics
(c)
Transistors and semiconductor devices
(d)
Transistors and integrated circuits
5. High frequency waves follow
(a)
the curvature of the earth
(b)
ionospheric propagation
(c)
the line of sight direction
(d)
the ground wave propagation
6. The RF channel in a radio transmitter produces
(a)
low frequency carrier waves
(b)
both audio signal and high frequency carrier waves
(c)
high frequency carrier waves
(d)
audio signals
7. The antimony trisulphide is a
(a)
super conductor
(b)
semiconductor
(c)
insulator
(d)
conductor
8. Coherent light may be detected by
(a)
light emitting diode
(b)
zener diode
(c)
photo diode
(d)
PN junction diode
9. Radiowaves propagated through the troposphere of the earth are known as
(a)
sky wave
(b)
space waves
(c)
surface waves
(d)
ground waves
10. _____ consists of solid centre conductor surrounded by a plastic insulator, which is further surrounded by a shield by fine wires.
(a)
Coaxial cable
(b)
Multiconductor flat cable
(c)
Twisted pair cable
(d)
Both a and b
