Class -5 Sound

1. How sound is formed?

Ans. Anything is vibrated sound is formed.

2. What is the unit of sound?

Ans: The unit of sound is decibel (dB).

3. How does sound propagate?

Ans. Sound propagates by wave through a medium (solid, liquid, gas).

4. What is a pleasant sound. Give example.

Ans. A sound that makes us happy is called a pleasant sound. 

     Example - kinds of music

5. What is an unpleasant sound? Give example.

Ans. A sound that makes us unhappy, irritated, or uncomfortable is called an unpleasant sound.

     Example - loud music, honking of vehicles

6.  What is a warning sound? Give example.

Ans. Some sounds are made for emergencies or awareness of danger is called warning sound.

       Examples- Police siren, Ambulance siren, Fire engine siren, and Fire alarm.

7. What is noise?

Ans: A loud unpleasant sound is called noise that makes physical and mental harm.

         Examples: Traffic on a busy road.

8. What is noise pollution?

Ans: Continuous and more noise that disturbs our mental and physical health is called noise pollution.

9. Write some harmful effects of noise pollution.

Ans: i) Loss of sleep and concentration.

        ii) Hypertension.

       iii) Dizziness, headache and stress.

10. How do you reduce noise pollution?

Ans: i) Avoid loudspeakers for too long.

        ii) Do not use horns unnecessarily.

       iii) Do not watch television loudly.

       iv) Plant more trees.

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