Physics - General Knowledge Questions and Answers

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Waves that are required for long distance wireless communication are

Infrared rays

Ultraviolet rays

Radio waves

Microwaves

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A television channel is characterised by

Frequency of transmitted signal

Velocity of transmitted signal

Physical dimension of television screen

Size of picture tube

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What is found in frequency modulation ?

Fixed frequency

Fixed dimension

Change in frequency and dimension

Change in dimension only

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Positive feedback is used in

Amplifiers

Rectifiers

Oscillators

None of these

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The waveform of a certain signal can be studied by

Spectrometer

Cathode ray oscilloscope

P – n junction diode

Sonometer

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The GPS device in an automobile uses which communication channel?

Satellite

Microwave

Radio frequency

Infrared

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In a optical fibre cable, the signal is propagated along the

Inner Core

Cladding

Both core and cladding

Surface and cladding

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The audio signals of TV are

Amplitude modulated

Frequency modulated

Unmodulated

Velocity modulated

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In radio-communication, the signals emitted by transmitting antenna are reflected on

Stratosphere

Ozonosphere

Ionosphere

Troposphere