Science

Sound

Question:

Identify the part which vibrates to produce sound in the following instruments.(a) Dholak (b) Sitar (c) Flute

Answer:

(a) Dholak is a musical instrument. It consists of a stretched membrane called its head. When the head is beaten gently the stretched membrane sets into vibration. Since sound is produced when an object vibrates, the dholak produces a sound.
(b) Sitar is a musical instrument. It consists of stretched strings. When a string is plucked, it sets into vibration. Since sound is produced when an object vibrates, the sitar produces a sound.
(c) Flute is a hollow pipe. When air is blown over its mouth, the air inside the pipe is set into vibration. As a result a pleasant sound is produced.
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Sound

Q 1.

The sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second. What is the time period of the vibration?

Q 2.

List sources of noise pollution in your surroundings.

Q 3.

Your parents are going to buy a house. They have been offered one on the roadside and another three lanes away from the roadside. Which house wouid you suggest your parents should buy? Explain your answer.

Q 4.

What is the difference between noise and music? Can music become noise sometimes?

Q 5.

Explain in what way noise pollution is harmful to humans.

Q 6.

A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency.

Q 7.

Sketch larynx and explain its function in your own words.

Q 8.

Identify the part which vibrates to produce sound in the following instruments.(a) Dholak (b) Sitar (c) Flute