Q1. Fill in the blanks.

                            i.        We cannot see air but we can ________it.

                           ii.        The blanket of air surrounding the earth is known as____________.

                          iii.        ___________is essential for supporting life on the earth.

                          iv.        Air occupies ___________.

                           v.        Winnowing is more effective in ____________air.

 

Q2. True/False

                            i.        Air is found everywhere. _______

                           ii.        Soil does not contain air. _______

                          iii.        The moving air makes it possible for you to fly your kite. _______

                          iv.        Carbon dioxide supports burning of a candle. _______

                           v.        Birds, bats and insects can fly due to the presence of air. ______

 

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 electricity?

 

Q10. What makes firki to rotate?

 

Q11. What is wind?

 

Q12. What may even uproot trees and blow off the rooftops?

 

Q13. What are those tiny shining particles in the beam of sunlight?

 

Q14. What do you understand by atmosphere?

 

Q15. From where does oxygen come in the air?

 

Q16. Which component of air used by green plants to make their food?

 

Q17. Why air is called a mixture of gases?

 

Q18. Why pages of an open book begin fluttering when the fan is switched on?

 

Q19. What is air made up of?

 

Q20. How do we feel the presence of air?

 

Q21. Why carbon dioxide gas is used in fire extinguishers?

 

Q22. Prove that soil contains air with help of an activity.

 

Last modified: Thursday, 3 January 2019, 9:51 PM