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Information and Communication Technology - 9
1.
What is the motion of the diaphragm when we speak into the mouthpiece?
a) Circulation
b) Rotation
c) Vibration
d) Translational
2.
What is produced by the vibration of diaphragm of the receiver?
a) Heat
b) None of these
c) Light
d) Sound waves
3.
What is the speed of sound in air?
a) 1642 km/h
b) 1246 km/h
c) 1264 km/h
d) 1426 km/h
4.
Who transmitted the first radio signal through the air?
a) Einstein
b) Newton
c) Graham Bell
d) Marconi
5.
What was the distinction of Marconi?
a) He transmitted the first radio signal through the space
b) He transmitted the first microwave through the air
c) He transmitted the first microwave through the space
d) He transmitted the first radio signal through the air
6.
What does AF stand for?
a) Alternating Fluency
b) Audio Fluency
c) Audio Frequency
d) Alternating Frequency
7.
Through which of the following device, sound waves produced at the radio station are changed into electrical signals?
a) Modulator
b) Demodulator
c) Amplifier
d) Microphone
8.
How many metal rods are present in transmission antenna?
a) One
b) Two
c) Four
d) Three
9.
At the receiving end, which part selects and amplifies the modulated signal?
a) Demodulator
b) Receiver
c) Modulator
d) Amplifier
10.
Telephone was invented in…………….?
a) 1836
b) 1839
c) 1837
d) 1876
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