Multiple choice

Consider the following statements:

  1. Dolphins detect their enemy and obstacles by emitting the supersonic waves and hearing their echo.
  2. Resonance of sound is observed in radio and TV receivers.

Which of the given statements is/are correct?

  1. Only 1

  2. Only 2

  3. Both 1 and 2

  4. Neither 1 nor 2
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Statement 1 is incorrect. Dolphins detect their enemy and obstacles by emitting the ultrasonic waves and hearing their echo. Solution 2 is correct. The tuning of radio and TV receivers is based on resonance. Radio and TV receivers have electronic circuits which produce vibrations of the different frequencies.

Keep practicing — related questions