Page 1 - COMPOSITION AND PROPERTIES OF AIR
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CHAPTER 13 – AIR AND WATER
TOPIC- COMPOSITION AND PROPERTIES OF AIR
OBJECTIVE QUESTIONS
Q.1 Fill in the blanks:
a) We need _____ present in air to light a fire.
b) Air contains 78% ____ and 21%______.
c) Air exerts ______________ in all directions.
d) The amount of water vapour in air is called_____________.
e) __________ is an essential nutrient for plants.
Q.2. Choose the correct option
I) Which of these gases is present in a very small quantity in air and is very
important to plants?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Inert gas
II) Air exerts pressure can be shown by which of the following example?
A) Swimming in ocean
B) Rain falling on ground
C) Flowing of air through tree leaves
D) Sucking up of water using straw
III) In which of the following processes is oxygen used up?
