Worksheet on Sound Class 3

1. Which of the following sounds is an example of noise pollution?

a) Birds chirping in a garden
b) Waves crashing on the beach
c) Rain falling on the roof
d) Construction machinery at a building site

Answer:  d) Construction machinery at a building site produces loud and disruptive noise, which can be categorised as noise pollution.

2. The sound produced by the following object is __.

a) soft and gentle
b) loud and powerful
c) high-pitched and squeaky
d) no sound at all

Answer: b) Loudspeakers are specifically built to amplify sound, making it louder and more powerful.

3. Which of the following is an example of a natural sound?

a)
b)
c)
d)

Answer: c) Rainfall is a natural occurrence and the sound of rain falling is a natural sound.

4. Judy is conducting an experiment on echoes. If she shouts in a wide-open space with no walls, what would she observe?

a) She will hear a loud echo.
b) She will hear a soft echo.
c) She will hear no echo at all.
d) She will hear multiple echoes.

Answer: c) In Judy's experiment, if she shouts in a wide-open space with no walls, there are no surfaces for the sound waves to bounce off and reflect back to her. As a result, she would not hear any echoes.

5. What can you do to protect your ears from loud noises?

a) Wear sunglasses
b) Cover your ears with your hands
c) Use headphones or earplugs
d) Close your eyes tight

Answer: c) Using headphones or earplugs can reduce the intensity of loud sounds and protect your ears from damage.