Arrange the materials in the increasing order of the speed with which sound will travel through them

• metal rod <Water<Air

• Water<metal rod < air

• Air<water<metal rod

• metal rod<air< water

What is the location of the above structure?

Can these two astronauts talk in space? Give reason

Choose the frequency range we can hear.

• 20Hz to 1000Hz

• 20Hz to 2000Hz

• 20Hz to 20000Hz

• All frequencies

The cause of sound production is

• loudness

• vibrations

• pitch

• amplitude

Drum is a -------------- type of musical instrument

• wind

• string

• percussion

• none of these

How does the sound vary if the size of bowls in jal tarang are changed?

The cup containing minimum water produce the sound of ....................(highest/ lowest ) frequency. As the amount of water in the cup goes on increasing , the frequency of sound goes on ........................ (increasing / decreasing)

An empty earthen pitcher/ bucket is kept under a water tap and starts filling with water as the tap is opened . The pitch of the sound produced

• goes on decreasing

• goes on increasing

• first increase and then decrease after the pitcher is half filled

• does not change

loudness of a sound depends on its -------------

• amplitude

• frequency

• pitch

• all of thse

Unpleasant sound is called...............