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Free tnpsc model questions Online Test - MeritNotes
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Online Exam
No. of Questions :10
Remaining Time :
1. An important term in amplitude modulation is
(a)
audio signal factor
(b)
carrier wave factor
(c)
modulation factor
(d)
none of the above
2. The portion of the Earth’s atmosphere which extends upto 15 km from the surface of the earth is
(a)
troposphere
(b)
photosphere
(c)
chromosphere
(d)
stratosphere
3. Which part of the electromagnetic wave is used for communication purpose?
(a)
Radiowaves only
(b)
Microwaves only
(c)
Both a and b
(d)
Infrared rays only
4. When phosphor coating in the monochrome picture tube is struck by the electron beam, it produces _____ light.
(a)
green
(b)
white
(c)
red
(d)
blue
5. The main purpose of modulation is to
(a)
produce side bands
(b)
transmit low frequency information over long distances efficiently
(c)
acquire wave shaping of the carrier wave
(d)
combine two waves of different frequencies
6. A receiving antenna converts
(a)
electromagnetic energy into electrical energy
(b)
electrical signal into electromagnetic energy
(c)
electrical signal into sound energy
(d)
sound energy into electromagnetic energy
7. In phase modulation
(a)
there is no change in the frequency and phase of the carrier wave
(b)
both the phase and the frequency of the carrier wave varies
(c)
only the phase of the carrier wave varies
(d)
only the frequency of the carrier wave varies
8. Audio frequency range
(a)
lies below 20 HZ
(b)
lies above 20,000 HZ
(c)
lies between 20-2000 Hz
(d)
lies between 20-20000 kHz
9. Usually radiowaves travel in
(a)
the form of compressions and rarefactions
(b)
parabolic path
(c)
curved path
(d)
straight line
10. In amplitude modulation
(a)
modulating frequency lies in the audio range
(b)
the amplitude of the carrier varies in accordance with the frequency of the modulating signal.
(c)
the amplitude of the carrier wave remains constant.
(d)
the amplitude of the carrier wave varies in accordance with the amplitude of the modulating signal.
