Q.1. What is the composition of air?
Q.2. How will you prove that air supports burning?
Q.3. How will you show that air is dissolved in water?
Q.4. Why does a lump of cotton wool shrink in Water?
Q.5. List five activities that are possible due to the presence of air.
Q.6. How do plants and animals help each other in the exchange of gases in the atmosphere?
Q.7. In a number of musical instruments, air plays an important role. Name few such instruments?
Q.8. Name of gas in atmosphere used in the soft drink bottles?
Q.9. Oxygen and nitrogen form 99% of the air. Other 1% is constitute by which components?
Q.10. We say that air is present everywhere. Have you ever seen it, what make you say so?
Q.11. Air is necessary for burning. Yes/No? Give reason for your answer.
Q.12. Air can be used to generate electricity. How?
Q.13. Due to the presence of which gas, when air is passed through lime water, turns it milky?
Q.14. During rainfall, the spaces between soil particles are filled with water. How do then organisms of soil breathe?
Q.15. Give reason why do factories have tall chimneys.
Q.16. Carbon dioxide gas is used to extinguish fire. Give reason.
Q.17. Why do mountaineers carry oxygen cylinders with them?
Q.18. Name the sources of carbon dioxide in air.
Q.19. Gases are present in certain ratios in air. Write the relative proportions of nitrogen and oxygen in air?
Q.20. Make sentences using the given set of words.
(a) 99%, oxygen, nitrogen, air, together
(b) Respiration, dissolved, animals, air, aquatic
(c) Air, wind, motion, called
Online Tuitions and Self-Study Courses for Grade 6 to 12 & JEE / NEET