Air and Water

Essential for Life - Air & Water Worksheet-5

Multiple-Choice Question:

1. Which of the following gas does not support burning?

(A) Oxygen                 (B) Nitrogen               (C) Carbon dioxide

2. Which of the following is the lowest layer of the Earth’s atmosphere?

(A) Troposphere        (B) Exosphere            (C) Thermosphere

Essential for Life - Air & Water Worksheet-7

1. Which of the following gas is essential for the survival of living things?

          (A) Carbon dioxide    (B) Nitrogen               (C) Oxygen

2. Which of the following is the topmost layer of the Earth’s atmosphere?

          (A) Exosphere            (B) Mesosphere         (C) Stratosphere

Essential for Life - Air & Water Worksheet-2

12. True/False:

a.      Argon is colourless and odourless gas.

b.      Mesosphere is the topmost layer of the earth.

c.      Ozone layer protects us from the harmful ultraviolet rays of the Sun.

d.      The rate of sedimentation can be improved by adding special chemical such as alum.

e.      Boiling is the only method of purifying the water.

f.       Rain is caused due to condensation of water vapour in the clouds.