sound and noise

unpleasent sound is also know as

• noise

• sound

• beat

• tempo tap

what is youre favourite pleasent sound instrument

• voilin

• piano

• guitar

• flute

What is noise?

• Pleasent sound

• Loud sound

• Unpleasant sound

• Lound and Unpleasant sound

what is warning sound

(a)  

chose two examples of noise pollution.

• chirping of birds

• A boy shouting in a loudspeaker

• Fighting in a conference meeting

• Sound of ocean waves

What kind of sound does the following object produce?

• Loud

• Pleasant

• Unpleasant

• None of these

What is sound?

• Sound is a type of energy made by vibrations.

• Sound is vibrations.

• sound is a type of energy that makes a noise.

• Sound is just a noise.

Define vibrations.

(a)  

Which one of the following is the cause of noise pollution

• Loudspeakers

• Listening to TV in low volume

• Honking of cars

• Bursting of crackers

What is a Decibel (dB)?

• a unit for how long a thing is

• a unit for how loud a sound is

• a unit for how heavy a thing is