General Physics Questions And Answers


Q1. 
‘X’ refers to the frequency range over which equipment operates or the range over which the frequencies in a signal vary. Identify ‘X’.

Ans.
Bandwidth


Q2. 
A transmitter is a device which recovers the original message signal from the signal received at the output of the communication channel.

Ans.
False


Q3. 
What is the loss of strength of a signal during its propagation called?

Ans.
Attenuation


Q4. 
What is meant by the term communication?

Ans.
Transfer of information


Q5. 
Name the device which converts energy from one form to another.

Ans.
Transducer


Q6. 
What happens in frequency modulation?

Ans.
The frequency of the modulated wave varies as the amplitude of the modulating wave


Q7. 
Identify the type of modulation where the frequency of the modulated wave is equal to that of the carrier wave.

Ans.
Amplitude modulation


Q8. 
What does AGC stand for?

Ans.
Automatic gain control


Q9. 
Why is AM used for broadcasting in the communication systems?

Ans.
Its use avoids receiver complexity


Q10. 
Of the following which is the preferred modulation scheme for digital communication?

Ans.
Pulse code modulation