Question

Which of the following is true about carrier signal?

(a) Carrier signals have low frequency

(b) Carrier signals are used to increase the wavelength of the signal

(c) Carrier signals have high frequency

(d) Carrier signals and message signals are the same

The question was asked in an interview for internship.

The above asked question is from Communication Systems in portion Communication Systems of Physics – Class 12

Answer 1

Right option is (c) Carrier signals have high frequency

Easiest explanation: Carrier signals have high frequencies and hence are used in the transmission of radio waves. This is because since space is an insulator, for having electric current in order to magnetize it is only possible if the source contains a rate of change of voltage or a varying electric field. All the other statements are not valid.