Grade 9 Sound Quiz 1

Eardrum is a part of

• larynx

• hearing organ

• nervous system

• skeletal system

The hearing range of human ear is

• less than 20 Hz

• 20 to 20KHz

• 2 to 2KHz

• greater than 20 KHz

The pitch of sound depends on

• amplitude

• frequency

• both of these

• none of these

To and fro motion of an object is called

• waves

• vibration

• amplitude

• frequency

speed of sound is maximum in

• solid

• liquid

• gas

• all the above

Large amplitude of sound vibrations will produce:

• loud sound

• slow sound

• sharp sound

• low sound

Bats detect the obstacles in their path by receiving the reflected

• infrasonic waves

• ultrasonic waves

• electromagnetic waves

• radio waves

What kind of musical instrument is a sitar?

• air

• string

• membrane

• none of the above

SI unit of time period is

• hour

• minute

• second

• metre

speed of sound in air is

• 220m/s

• 330 m/s

• 650m/s

• 130 m/s