Sound

Sound is a kind of ___________.

• work

• energy

• force

• pressure

The hearing range of the human ear is ___________.

• 20 Hz to 20,000 Hz

• less than 20 Hz

• more than 20,000 Hz

• 20 Hz to 25,000 Hz

Pitch of sound is determined by its ___________.

• frequency

• speed

• amplitude

• loudness

Above _____ dB, sounds becomes physically painful to the ear.

• 60

• 40

• 150

• 80

The frequency of subsonic sound is ___________.

• more than 20 Hz

• 100 Hz

• less than 20 Hz

• more than 20,000 Hz

Sound travels fastest through ___________.

• vacuum

• air

• water

• solids

1 hertz is equal to ___________.

• 1 vibration per minute

• 10 vibrations per minute

• 60 vibrations per minute

• 600 vibrations per minute

Sound cannot travel through ___________.

• air

• water

• wood

• vacuum

Sound in the audible range is called ___________.

• ultrasonic sound

• sonic sound

• subsonic sound

• light sound

A pendulum oscillates 20 times in 4 seconds. Find its time period.

• 0.05 s

• 0.001 s

• 0.2 s

• 0.25 s