Session 1: Air Pollution
Unit 5: Automobile and Environment
Textual Question-Answers
Check Your Progress
A. Fill in the blanks
1. The need of the hour is to check the …………….. and …………….. ofour precious natural resources.
Ans: The need of the hour is to check the depletion and pollution of ourprecious natural resources.
2. In order to control environmental pollution, the Government ofIndia has passed the ……………….. Act 1986 to protect and improve thequality of our …………….. (air, water and soil).
Ans: In order to control environmental pollution, the Government of Indiahas passed the Environment Protection Act 1986 to protect and improve thequality of our environment (air, water and soil).
3. Air pollutants deleteriously affect the ………………. system ofhumans and of animals.
Ans: Air pollutants deleteriously affect the respiratory system of humansand of animals.
4. The full form of CNG is ……………………….
Ans: The full form of CNG is Compressed Natural Gas.
5. Automobiles are a major ……………….. of atmospheric pollution.
Ans: Automobiles are a major source of atmospheric pollution.
6. Euro II norms, for example, stipulate that sulphur be controlledat ………………….. parts-per-million (ppm) in diesel and ……………. ppm in petrol.
Ans: Euro II norms stipulate that sulphur be controlled at 500 parts-permillion (ppm) in diesel and 150 ppm in petrol.
B. Multiple choice questions
1. The latest version of emission standards to be followed in Indiaare ………………..
(a) BS-IV
(b) BS-III
(c) BS-II
(d) EURO-III
Ans: (a) BS-IV
2. A substantial fall of which gases level was found in Delhi between1997 and 2005 due to CNG?
(a) CO, and SO,
(b) Co, and Sio
(c) CO and SO
(d) None of the above
Ans: (c) CO and SO
3. An undesirable change in physical, chemical or biological characteristics of air, land, water or soil is known as ………………
(a) population
(b) pollution
(c) propulsion
(d) None of the above
Ans: (b) pollution
4. The Government of Delhi decided to convert all the buses toCNG by the end of year ……………….
(a) 2022
(b) 2016
(c) 2002
(d) 2006
Ans: (c) 2002
C. Short answer questions
1. Why is it important to control air pollution?
Ans: It is important to control air pollution to protect human health, prevent respiratory diseases, safeguard animals and plants, and maintain environmental balance.
2. What is the role of a convertor in an automobile?
Ans: The converter, also known as a catalytic converter, reduces harmful exhaust emissions by converting toxic gases into less harmful substancesbefore they are released into the atmosphere.
3. How has CNG helped in controlling pollution?
Ans: CNG has helped in controlling pollution by reducing emissions ofharmful gases, producing less smoke, and improving air quality compared topetrol and diesel fuels.
