of Air and Water
Q1. Which of the following is not a greenhouse gas?
(a) Carbon dioxide
(b) Sulphur dioxide
Ans. (d) Nitrogen
Q2. Which air pollutant reduces the oxygen-carrying capacity of
Ans. Carbon monoxide reduces the oxygen-carrying
capacity of the blood.
Q3. What protects us from harmful ultraviolet rays of the sun?
The ozone layer protects us from harmful ultraviolet rays of the sun.
Q4. Name three greenhouse gases present in the atmosphere.
methane, nitrous oxide and carbon dioxide
Q5. What is potable water?
Ans. Water which is purified and fit for drinking is
known as potable water.
Q6. Which gas contributes maximum to greenhouse effect?
Ans. Carbon dioxide gas contributes maximum to
Q7. Name one gas which damages the ozone layer of the
Ans. Chlorofluorocarbons (CFCs) damage the ozone layer
of the atmosphere.
Q8. Why is Ozone layer important?
Ans. Ozone layer protects us from harmful ultraviolet
rays of the sun.
Q9. Name some toxic metals whose compounds are present in
arsenic, lead and fluorides
Q10. Name any two types of chemicals used in agriculture which
cause water pollution.
pesticides and weedicides
Q11. Name any three diseases caused by drinking polluted water
cholera, typhoid and jaundice
Q12. Which gas is mainly responsible for greenhouse effect?
Ans. Carbon dioxide is the gas which is mainly
responsible for greenhouse effect.
Q13. What are the main gases that cause acid rain?
Ans. Sulphur dioxide and nitrogen dioxide are the main
gases that cause acid rain.
Q14. Where are chlorofluorocarbons used?
Ans. Chlorofluorocarbons (CFCs) are used in
refrigerators, air conditioners and aerosol sprays.
Q15. What are the major pollutants of air?
Ans. Carbon monoxide, nitrogen oxides, carbon dioxide,
methane and sulphur dioxide are the major pollutants of air.
Q16. What air pollutants are released by motor vehicles?
Ans. Vehicles produce high levels of pollutants like
carbon monoxide, carbon dioxide, nitrogen oxides and smoke.
Q17. What is air pollution?
Ans. Air pollution is the contamination of air by
impurities which may have a harmful impact on the living organisms and the
Q18. Write one source and one harmful effect of carbon monoxide.
Ans. Carbon monoxide is produced from incomplete
burning of fuels such as petrol and diesel. It is a poisonous gas. It reduces
the oxygen-carrying capacity of the blood.
Q19. Write one source and one harmful effect of sulphur dioxide.
Ans. Sulphur dioxide is produced by combustion of
fuels like coal in power plants. It can cause respiratory problems, including
permanent lung damage.
Q20. What is Kyoto Protocol?
The Kyoto Protocol is an international agreement that aimed to reduce carbon
dioxide (CO2) emissions and the presence of greenhouse gases in