Page 95 - Viva ICSE Science 5 : E-book
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QUICK LOOK
1. We hear a variety of sounds throughout the day.
2. Diff erent objects like clock, pressure cooker, piano, etc. produce diff erent sounds.
3. Leaves of the plants produce rustling sound as the wind blows.
4. Diff erent birds produce diff erent sounds like hens cluck and ducks quack.
5. We can also list some sounds made by animals like lions roar, dogs bark and frogs croak.
6. Sounds that make us feel happy and relaxed are known as pleasant sounds.
7. Sounds that create disturbance are unpleasant sounds.
8. Warning sounds alert people about a certain situation. For example, sirens of emergency
vehicles produce warning sounds.
9. Loud and unpleasant sound is called noise.
10. When noise becomes so excessive that it causes disturbance to the health of living beings,
it is called noise pollution.
EXERCISES
A. Fill in the blanks.
1. Dry fallen leaves make __________ sound when we walk over them.
2. The sounds that humans make can be __________ or made by human
__________.
3. We fi nd __________ pitched sounds pleasing.
4. Unpleasant sounds are also called __________.
5. Loud sounds which are needed to alert people are called __________ sounds.
6. Noise pollution has harmful eff ects on __________ and __________ health of
living beings.
B. Write (T) for true and (F) for false statements.
1. Alarm is louder and softer than the tick-tock sound of a clock.
2. All birds make similar sound.
3. Trees and plants block noise.
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