Multiple choice

In ______ frequency modulation transmission started.

  1. 1932

  2. 1931

  3. 1933

  4. 1837

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Frequency modulation (FM) radio transmission began in 1933 when Edwin Howard Armstrong successfully developed and demonstrated FM technology. FM provided better sound quality and noise resistance compared to AM radio. 1931 and 1932 are incorrect, and 1837 is far too early (radio itself wasn't invented then).