Question

The process of the superimposing audio or the video messages on r.f. carrier is called modulation:
(A) True
(B) False

Answer 1

Hint
A carrier wave is really made up of constant frequency, a bit similar to the sine wave. It does not much information .To involve data and the information ,another wave has to be imposed known as the input signal above the carrier wave .This process of imposing of the input signal on the carrier wave is known as modulation.

Complete step by step answer
Modulation is the process of the super imposing the low audio frequency baseband messages or the information signals known the modulation signal on a high frequency wave is called the carrier wave.
The final and the resultant wave is called the modulated wave
In short or other language it can be also known as hiding a code in the carrier wave.
So statement is true.

Note
Demodulation: It can be defined as the extracting of the original information carrying the signal from the modulation carrier wave.
Application: A is used in the short wave and the radio wave broadcasting also known FM is used in tee high frequency radio broadcasting.
An amplifier is the electronic device that can increase the power of a signal (a time varying voltage or current) It is two port electronic circuit that uses electric power from a power supply to increase the amplitude of the of the signal applied to its input terminals producing a proportionality greater amplitude signal as its output