+2 Physics Unit 10 - Communication Systems
.png "+2 Physics Unit 10 - Communication Systems - Quiz")
Prepared by P. ILAIYARAJA M. Sc. ,B. Ed. , PG ASST IN PHYSICS , GHSS, PANCHANATHIKKULAM EAST, NAGAI DT. ; & www. Padasalai. Net
- 1.High frequency waves follow
- A.
Ionospheric propagation
- B.
The curvature of the earth
- C.
The ground wave propagation
- D.
The line of sight direction
- 2.The main purpose of modulation is to
- A.
transmit low frequency information over long distances efficiently
- B.
Produce side bands
- C.
Acquire wave shaping of the carrier wave
- D.
Combine two waves of different frequencies
- 3.In amplitude modulation
- A.
The amplitude of the carrier wave varies in accordance with the amplitude of the modulating signal.
- B.
The amplitude of the carrier wave remains constant
- C.
The amplitude of the carrier varies in accordance with the frequency of the modulating signal
- D.
Modulating frequency lies in the audio range
- 4.In amplitude modulation, the band width is
- A.
Twice the signal frequency
- B.
Thrice the signal frequency
- C.
Four times the signal frequency
- D.
Equal to the signal frequency
- 5.In phase modulation
- A.
Both the phase and the frequency of the carrier wave varies.
- B.
There is no change in the frequency and phase of the carrier wave
- C.
Only the phase of the carrier wave varies
- D.
Only the frequency of the carrier wave varies.
- 6.The RF channel in a radio transmitter produces
- A.
High frequency carrier waves
- B.
both audio signal and high frequency carrier waves
- C.
Low frequency carrier waves.
- D.
Audio signals
- 7.The purpose of dividing each frame into two fields so as to transmit 50 views of the picture per second is
- A.
To avoid flicker in the picture
- B.
The fact that handling of higher frequencies is easier
- C.
that 50 Hz is the power line frequency in India
- D.
To avoid unwanted noises in the signals
- 8.Printed documents to be transmitted by fax are converted into electrical signals by the process of
- A.
Scanning
- B.
modulation
- C.
Light variation
- D.
Reflection
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