Question

Why interlacing is used in television?

(a) to reduce noise in video signals

(b) to ensure that all the lines on screen are scanned

(c) to reduce the disturbances

(d) to avoid flicker

I had been asked this question during an interview.

Question is taken from Noise for DSB-SC in section Noise of Analog Communications

Answer 1

The correct choice is (d) to avoid flicker

To explain: Interlacing is used for doubling the perceived frame rate of a video display without consuming the extra bandwidth. It is mostly used in television to avoid flicker.