(i) This is not true about air.
(a) We can see air all around us.
(b) All living things need air to breathe.
(c) Air takes up space.
Ans: (a)
It is present everywhere around us. Air has no colour and one can see through it. It is transparent. Our earth is surrounded by a thin layer of air.
(ii) Strong and fast moving air is called a
(a) wind
(b) breeze
(c) storm
Ans: (c)
Storm : Fast and strong moving wind is called storm.
(iii) The movement of different objects along with the air tells us that
(a) air takes up space
(b) air is all around us
(c) air always blows in a certain direction
Ans: (c)
The movement of different objects along with the air tells us that air always blows in a certain direction.
(i) _________ from vehicles pollutes the air.
Ans: Smoke from vehicles pollutes the air.
Smoke from vehicles pollutes the air.
(ii) When we blow up a balloon, we are filling Air into it.
Ans: When we blow up a balloon, we are filling ____________ into it.
When we blow up a balloon, we are filling air into it.
(iii) Moving air is called ____________ .
Ans: Moving air is called Wind.
(i) A breeze can be very dangerous.
Ans: False
Breeze: Slow and gentle moving wind is called breeze.
(ii) Air helps the birds to fly.
Ans: True
Birds can fly only due to the presence of air. They fly by pushing the air downwards and backwards with their wings.
(iii) Air is present everywhere.
Ans: True
It is present everywhere around us. Air has no colour and one can see through it. It is transparent. Our earth is surrounded by a thin layer of air.
Ans:
(i) Name any three things that make the air impure.
Ans: Human air pollution is caused by things such as factories, power plants, cars, airplanes, chemicals, fumes etc.
(ii) What is a storm?
Ans: Storm: a violent weather with strong winds
Example sentence: The storm took away the umbrella I was carrying.
13 videos|80 docs|24 tests
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1. What is the composition of air? |
2. How is air important for living organisms? |
3. How does air pollution affect human health? |
4. What are the sources of air pollution? |
5. How can we reduce air pollution? |
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