8th Standard CBSE Syllabus & Materials
8th Standard CBSE
CBSE 8th Standard Social Science Dis - Man-made Disasters - An Overview Important Questions And Answers Study Material - QB365
NEW8th Standard CBSE
CBSE 8th Standard Social Science Dis - Drought Important Questions And Answers Study Material - QB365
NEW8th Standard CBSE
CBSE 8th Standard Social Science Dis - Floods Important Questions And Answers Study Material - QB365
NEW8th Standard CBSE
CBSE 8th Standard Social Science Dis - Cyclones Important Questions And Answers Study Material - QB365
NEW8th Standard CBSE
CBSE 8th Standard Social Science Dis - Earthquakes Important Questions And Answers Study Material - QB365
NEW8th Standard CBSE
CBSE 8th Standard Social Science Dis - Being Prepared-A Vital Part of Disaster Management Important Questions And Answers Study Material - QB365
Published on: 29/10/2025
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Questions + Answers key
Take MCQ Science Test
1.
Which of the following is nota greenhouse gas?
Carbon dioxide
Sulphur dioxide
Methane
Nitrogen
2.
A pond contains clean water. Which of the following activities will produce least pollution of water?
Washing clothes in the pond
Bathing animals in the pond
Washing motor vehicles in the pond
Swimming in the pond
3.
Trees help in reducing the pollution of our environment. Lakhs of trees are planted by people in the month of July every year. This occasion is called
Forest Conservation Day
Plantation month
Van Mahotsav
Wildlife week
4.
Which of the following gases combines with the blood and prevents it from carrying oxygen?
Carbon monoxide
Carbon dioxide
Nitrogen oxide
Nitrogen trioxide
5.
Air is a mixture of various gases. One of the gas is 21% part of the air and is essential for the survival of human beings. This gas is
nitrogen
oxygen
ozone
argon
6.
Which of these can cause acid rain ?
Carbon monoxide
Carbon dioxide
Sulphur dioxide
Nitrogen
7.
Which of the following is not a source of air pollution?
Automobile exhaust
Burning of firewood
Windmill
Powerplant
8.
Which of the following will reach the earth in greater amounts if the amount of chlorofluorocarbons released into the air increases?
Infrared rays
X-rays
Gamma rays
Ultraviolet rays
9.
The type of pollution which is likely to affect Taj Mahal in Agra to a greater extent is
air pollution
water pollution
soil pollution
noise pollution
10.
The phenomenon of 'marble cancer' is due to
soot particles
CFCs
log
acid rain
11.
Highest percentage of air consists of
oxygen
carbon dioxide
nitrogen
argon
12.
Potable water is the water which is
obtained from a river
obtained from a lake
pure and fit for drinking
used only for washing clothes
13.
Biological pollution in water is caused by
coal mines
domestic sewage and animal excreta
oil spills
chemicals like paint
14.
The Kyoto protocol is associated with one of the following.
Reduction in the use of chlorofluorocarbons
Reduction in the emission of greenhouse gases
Reduction in the cutting of forest trees
Reduction in pollution of fresh water sources
15.
Boojho wishes to contribute in reducing air pollution. Which vehicle should he use for going to school?
Car
School bus
Autorickshaw
Scooter
16.
Which of the following is not a way to conserve water?
Replace
Reduce
Reuse
Recycle
17.
Bathing and washing near water bodies should be ______
18.
Any undesirable change in the physical, chemical or biological characteristics of the natural environment is called______
19.
CFCs deplete the______
20.
The_______ of carbon dioxide in the atmosphere may be responsible for global warming.
21.
When air is contaminated by______ substances which have a______effect on both the _____and _____it is referred to as_______
22.
Many________ are responsible for causing __________pollution. Petroleum_______are a major source of_________ pollutants like_______ and________.
23.
While______your teeth, leaving the______ running may waste several_________of water.
24.
Water which is suitable for ______ is called _______water
25.
Water which looks clean still has disease carrying _______and _____ impurities.
26.
Carbon dioxide
27.
Sulphur dioxide and nitrogen dioxide
28.
Smog
29.
Marble cancer
30.
Dysentery
31.
Asthma
32.
Oxides which affect vegetation
33.
Condensed water vapour in air
34.
SO2
35.
IR radiations
36.
Sulphur dioxide
37.
Carbon dioxide
38.
Carbon monoxide
39.
Chlorofluorocarbons
40.
Air pollution
41.
Chemical contamination
42.
Global warming
43.
Green house effect
44.
Pollutants
45.
Potable water
46.
Water pollution
47.
Taj Mahal
48.
Ultraviolet radiations are absorbed by ozone.
49.
SO2, CO and NO2 oxides are polluting the gases.
50.
Global warming is a serious threat for life on the earth.
51.
Water fit for drinking is potable water.
52.
Sulphur dioxide and nitrogen dioxide gases are responsible for acid rain.
53.
Refrigerators, air conditioners and aerosol sprays have CFC pollutant.
54.
Potable water is translucent.
55.
We can survive for sometime without air but we cannot survive even for a few minutes without food.
56.
A brick kiln emits lot of smoke and other harmful gases causing air pollution.
57.
Chlorination is a commonly used chemical method for killing germs in water.
58.
Water which is suitable for drinking is called soft water.
59.
We were imaging a time when clean air and water may no longer be available. Why?
60.
Write the composition of air by volume.
61.
What are air pollutants ?
62.
How are vehicles responsible for air pollution?
63.
What is smog?
64.
What steps are taken by the Supreme Court to save Taj Mahal?
65.
Define greenhouse effect
66.
What is Kyoto Protocol?
67.
Name few alternative fuels to reduce pollution
68.
Define potable water
69.
What is chlorination?
70.
Who organized 'Say no to cracker' campaign?
1.
Nitrogen is not a greenhouse gas. It is naturally found in the air and is a major constituent of it.
2.
(d)
Swimming in the pond
3.
(c)
Van Mahotsav
4.
(a)
Carbon monoxide
5.
(b)
oxygen
6.
(c)
Sulphur dioxide
7.
(c)
Windmill
8.
(d)
Ultraviolet rays
9.
(a)
air pollution
10.
(d)
acid rain
11.
(c)
nitrogen
12.
(c)
pure and fit for drinking
13.
(b)
domestic sewage and animal excreta
14.
(b)
Reduction in the emission of greenhouse gases
15.
16.
(a)
Replace
17.
( )
avoided
18.
( )
Pollution
19.
( )
ozone
20.
( )
increase
21.
( )
unwanted,harmful,living,air pollution
22.
( )
Industries,air,refineries,gaseous,sulpher dioxide,nitrogen dioxide
23.
( )
Brushing,tap,litres
24.
( )
drinking,potable
25.
( )
microorganisms, dissolved
26.
( )
Global warming
27.
( )
Acid rain
28.
( )
Smoke and fog
29.
( )
Corrosion of marble
30.
( )
Contamination of water
31.
( )
Caused by smog
32.
( )
Nitrogen oxides
33.
( )
Fog
34.
( )
Caused by smog
35.
( )
CO2
36.
( )
acid rain
37.
( )
green house effect
38.
( )
reduces oxygen carrying capacity of blood
39.
( )
damage ozone layer
40.
( )
Smoke and Dust
41.
( )
Industrial waste
42.
( )
CO2
43.
( )
CO2 gas trapping in excess
44.
( )
Contaminated air and water
45.
( )
Safe drinking water
46.
( )
River Ganga
47.
( )
Air pollution
48.
(a)
49.
(a)
50.
(a)
51.
(a)
52.
(a)
53.
(a)
54.
(b)
55.
(b)
56.
(a)
57.
(a)
58.
(b)
59.
( )
Due to environmental pollution
60.
( )
78% is nitrogen and about 21% of oxygen, 0.9% argon, 0.3%CO2, rest other gases
61.
( )
The substances that contaminate the air are called air pollutants.
62.
( )
Vehicles produce high level of pollutants such as carbon monoxide, carbon dioxide, nitrogen oxide and smoke
63.
( )
A thick fog like layer in the atmosphere especially during winters, which is made of smoke and fog is called smog.
64.
( )
It has ordered industries to switch to cleaner fuels like CNG and LPG. The automobiles should switch over to unleaded petrol in Taj zone
65.
( )
The trapping of radiations from sun rays by earth's atmosphere is called greenhouse effect.
66.
( )
Kyoto Protocol is an agreement to reduce the emission of green house gases.
67.
( )
CNG and LPG
68.
( )
Water that is suitable for drinking
69.
( )
Chlorination is commonly used chemical method for purifying water.
70.
( )
Children from many schools organized "Sayno to cracker" to reduce air pollution during Diwali.
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