Page 83 - Viva ICSE Science 4 : E-book

EXERCISES

A. Fill in the blanks.

1. Matter exists in three diff erent states—solid, liquid and ____________.

2. Air is composed of ____________ of gases.

3. ____________ is the most abundant gas in air.
4. Process of taking in and giving out air is called ____________.

5. ____________ is the act of giving out air.

6. Plant more ____________ to keep air clean and fresh.

B. Tick () the correct answer.

1. Anything that has mass and occupies space is called ____________.

(a) solid (b) matter (c) stone

2. Particles are very closely packed in ____________.
(a) solid (b) liquid (c) gas

3. The act of taking in air into lungs is called ____________.
(a) breathing (b) inhalation (c) exhalation

4. Air pollution is caused ____________.
(a) naturally

(b) by human activity

(c) by both (a) and (b)

5. ____________ make the air unhealthy for breathing.

(a) Pollutants (b) Trees (c) Exhalation

6. ____________ is a disease not caused by air pollution.
(a) Tuberculosis (b) Asthma (c) Malaria

C. Answer the following in one word.

1. It is a gaseous state of water present in the air. ______________
2. It has no fi xed shape. It takes the shape of the container. ______________

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