Echo of Sound Multiple Choice Questions with Answers – PDF Download

To communicate with each other, Elephants use

1. low frequency sound waves
2. low frequency light waves
3. high frequency sound waves
4. low frequency heat waves

When sound is incident on the surface of a medium it bounces back into the first medium. The phenomenon is called

1. refraction of sound
2. deflection of sound
3. defraction of sound
4. reflection of sound

The total distance covered by the sound from the point of generation to the reflecting surface and back should be at least

1. 30 m
2. 34 m
3. 40 m
4. 38 m

For hearing distinct echoes, the minimum distance of the obstacle from the source of sound must be

1. double to this distance
2. equal to this distance
3. half of this distance
4. one third to this distance

Echoes may be heard more than once due to successive or multiple reflections

1. deflections
2. defraction
3. refractions
4. reflections