NCERT Class 8 Science Chapter 18 Pollution of Air and Water Extra Questions and Answers
Class 8 Science Chapter 18 Extra Questions and Answers – Pollution of Air and Water. Here in this Page Class VIII Students can Learn Extra Questions & Answer 18th Chapter Science fully Inside.
We Provided Here Pollution of Air and Water Science Chapter 18 Long Answer Type Question, Very Short Type Questions (VSA) / MCQ Type Questions, Short Type Questions (SA).
1) Fill in the blanks:
a) ____ is a greenhouse gas. (Methane)
b) ____ is a water pollutant. (Arsenic)
c) ____ is a source of air pollutant. (Factories)
d) ____ is produced from incomplete burning of fuel. (Carbon monoxide)
2) Multiple choice questions:
a) ____ damage the ozone layer of the atmosphere?
a) CFCs b) CO2
Ans. a) CFCs
b) ____ can cause permanent lung damage?
a) Nitrogen dioxide b) Sulphur dioxide
Ans. b) Sulphur dioxide
c) ____ causes marble cancer of the Taj Mahal?
a) Acid rain b) CFC
Ans. a) Acid rain
d) ____ are the major source of gaseous pollutants?
a) Dung cakes b) Petroleum refineries
Ans. b) Petroleum refineries
3) Answer the following questions:
a) Name two greenhouse gases.
Ans. Two greenhouse gases are CO2 and CH4.
b) Name some major contaminants of water.
Ans. Some major contaminants of water are sewage, agricultural chemicals and industrial waste.
c) What are the effects of global warming?
Ans. The global warming can cause sea levels to rise dramatically. It could also result in wide ranging effects on rainfall patterns, agriculture, forests, plants and animals.
d) How smog is formed? What is the effect of smog?
Ans. Smoke may contain oxides of nitrogen which combine with other air pollutants and fog to form smog.
The smog causes breathing difficulties such as asthma, cough and wheezing in children.
4) Match the items of column I with the information of column II:
Column I Column II
a) Carbon monoxidei) one of the gases responsible for Global Warming
b) N2Oii) produced by combustion of fuels like coal
c) Sulphur dioxideiii) reduces the oxygen-carrying capacity of the blood
d) CO2iv) greenhouse gas
Ans. a) – iii), b) – iv), c) – ii), d) – i).
5) The industries located in and around Agra like rubber processing, automobile, chemicals and especially the Mathura oil refinery, have been responsible for producing pollutants likeSulphur dioxide and Nitrogen dioxide. These gases react with the water vapor present in the atmosphere to form sulfuric acid and nitric acid. The acids drop down with rain, making the rain acidic. This is called acid rain. Acid rain corrodes the marble of the monument. The phenomenon is also called “Marble cancer”. Suspended particulate matter, such as the soot particles emitted by Mathura oil refinery, has contributed towards the yellowing of the marble.
a) What is acid rain?
Ans. The industries located in and around Agra like rubber processing, automobile, chemicals and especially the Mathura oil refinery, have been responsible for producing pollutants like Sulphur dioxide and Nitrogen dioxide. These gases react with the water vapor present in the atmosphere to form sulfuric acid and nitric acid. The acids drop down with rain, making the rain acidic. This is called acid rain.
b) The Mathura oil refinery has been responsible for producing pollutants like _____ and _____. (Sulphur dioxide and Nitrogen dioxide)
c) _____ corrodes the marble of the monument.(Acid rain)
More extra Questions & Answers
Q.1] fill in the blanks
1] smog is a combination of smoke and fog.
2] the substances which contaminate the air are called as air pollutants.
3] RRR stands for reduce, reuse and recycle.
4) Incomplete burning of fuel produces a carbon monoxide gas.
5) Increased level of greenhouse gases like CO2 causes global warming.
Q.2) Say whether the following statement are true or false.
1) Water which is suitable for irrigation is called as Potable water.
False
2) Carbon dioxide is a greenhouse gas.
True
3) Air consists of 21% of nitrogen gas .
False
4) By using LPG &CNG , we can control air pollution .
True
5) Acid rain corrodes the marble of monument resulting in phenomenon called as Marble cancer.
True
Q.3) Answer the following
1) What are air pollutants ?
Answer – The substance which contaminate the air are called pollutants.
2) what causes global warming?
Ans–Increased level of greenhouse gas like CO2 causes global warming.
3) What is marble cancer ?
Ans – Due to gases releases from factories reacts with vapour in atmosphere forms sulphur and nitric acid and makes the raindrop acidic. These acid rain corrodes the marbles. These phenomenon is Marble cancer.
4) Name any 2 measures to control air pollution.
Ans- I)Make more use of public vehicle instead of private in .
Ii)Increase the growth of bicycle or electrical vehicle which does not release the polluting gases.
5)Define : Greenhouse effect
Ans: Greenhouse effect is a natural process that warms the earth’s surface. Some of the green house gases are Carbon dioxide , Methane .
6) Name any three pollutants of air.
Ans: Sulphur dioxide , Carbon monoxide , Nitrogen oxide.