Write the name of two musical instruments.

Name the vibrating part of Veena and flute.

Name two musical instruments which produce sound by simple beaten.

Name the part of the body which produces sound (voice).

Mention the position of muscles of vocal cord when we are not speaking.

Whether sound can travel without medium?

Explain the reason of not putting the sharp or pointed things into the ear.

In toy telephone the sound travels through which medium?

State the SI unit in which the loudness of sound is measured.

State the relation between time period and frequency.

Name the characteristic property of sound through which we can differentiate between the sound of male and female.

Mention the range of audible sound of us.

Mention the reason behind the creation of noise.

We should plant trees along roadside. Explain why.

Explain in brief about hearing impairment.

Explain how does a sound making object differ from one that is silent.

Mention the reason that brings the sound of fire crackers to our ears.

Mention the name of passage in the outer ear which carries sound waves to the eardrum.

Sound can travel through vacuum. Is it correct?

What do you understand by amplitude of vibration?

Write the unit of loudness of sound.

How much loudness can be tolerated by a normal human being?

Cymbals (manjira) produces sound. Explain how.

Differentiate infrasonic sounds and ultrasonic sounds.

The moment we put our ear to the railway line, we can hear the sound of an approaching train even when the train is far off but its sound cannot be heard through the air. Why?

Thunder is heard after lighting. Give reasons.

Why are the voices of men and women different?

How is musical sound differ from noise?

Write some harmful effects of noise pollution.

Draw a labelled diagram of larynx and explain its functions.

Draw a neat labelled diagram of human ear and explain its working.

Mention the frequency of sound produced when the vocal cords are (a) tight and thin, (b) loose and thick.

Define vibrations and frequency with examples.

Sound produced by a stretched wire is due to vibrations. Show by an activity.