Question

Which of the following is false?

(a) Bandpass filters filter out the unwanted frequencies

(b) The transmitting antenna transmits the signal over large distances

(c) Attenuation should be reduced for a signal

(d) The modulated signal is quite strong

I got this question during an interview.

The doubt is from Communication Systems topic in section Communication Systems of Physics – Class 12

Answer 1

Correct choice is (d) The modulated signal is quite strong

Explanation: No, the modulated signal is quite weak and cannot sustain attenuation over a large distance. So, the modulator is followed by a power amplifier that provides the necessary power, and then the modulated signal is fed to an antenna of appropriate size for radiation.