Q1. Fill in the blanks.
We cannot see air but we can feel
The blanket of air surrounding the earth is
known as atmosphere.
is essential for supporting life on the earth.
Air occupies space.
Winnowing is more effective in moving
Air is found everywhere. True
Soil does not contain air. False
The moving air makes it possible for you to
fly your kite. True
Carbon dioxide supports burning of a
Birds, bats and insects can fly due to the
presence of air. True
Q3. Which is the major component of air?
Q4. What percentage of air is nitrogen?
Q5. Which gas is important for burning to occur?
Q6. What percentage of air is oxygen?
Q7. What is the name of the gas we breathe in?
Q8. What is the name of the gas we breathe out?
Q9. Which device is used to harness wind energy to generate
Q10. What makes firki to rotate?
Moving air makes firki to rotate.
Q11. What is wind?
Air in motion is called wind.
Q12. What may even uproot trees and blow off the rooftops?
The high velocity winds or Storms
Q13. What are those tiny shining particles in the beam of
Those tiny shining particles are the dust particles present in the air.
Q14. What do you understand by atmosphere?
The envelope of air that surrounds the earth is known as atmosphere.
Q15. From where does oxygen come in the air?
Plant release oxygen in the air by the process of photosynthesis.
Q16. Which component of air used by green plants to make their
The component of air used by green plants to make their food is carbon dioxide.
Q17. Why air is called a mixture of gases?
Air is called mixture of gases because it is made up of many different gases.
Q18. Why pages of an open book begin fluttering when the fan is
Pages of an open book begin fluttering when the fan is switched on because of
Q19. What is air made up of?
is a mixture of nitrogen, oxygen, carbon dioxide, water vapor and a few other
gases. Some dust particles may also be present in it.
Q20. How do we feel the presence of air?
We cannot see the air around us but we can feel its presence when the leaves of
the trees rustle or the clothes hanging on a clothes-line sway.
Q21. Why carbon dioxide gas is
used in fire extinguishers?
Carbon dioxide gas is used in fire extinguishers because it does not support
Q22. Prove that soil contains air with help of an activity.
Take some soil in a glass. Then add water to it, the air bubbles comes out of
the soil. These bubbles indicate the presence of air in the soil.