A man can hear a sound of frequency :

1. 1 Hz
2. 1000 Hz
3. 200 Hz
4. 5 MHz

The speed of ultrasound in air is :

1. the same as audible sound
2. less than audible sound
3. more than audible sound
4. equal to the speed of light

Elephants produce ……………sound :

1. ultrasonic
2. infrasonic
3. supersonic
4. none of the above

…………… can hear the highest frequency range of sound.

1. Whales
2. Dogs
3. Cats
4. Bats