CBSE Class 8 Science Worksheet
Pollution of Air and Water
1.
Which of the following cause/causes water pollution?
A)
Sewage
B)
Industrial wastes
C)
Pesticides
D)
All of these
2.
Choose the correct answer: Non point source of water pollution is ____________.
A)
nutrition run off
B)
industries
C)
oil spills
D)
domestic wastes
3.
Which of these causes water pollution?
A)
Sewage
B)
Industrial wastes
C)
Fertilizers
D)
All of these
4.
State True or False: Smog is an air pollutant.
A)
true
B)
false
5.
State True or False: Sulphur dioxide is a greenhouse gas.
A)
true
B)
false
6.
Which of the following has resulted in discoloring of Taj Mahal?
A)
Air pollution
B)
Acid rain
C)
soil erosion
D)
Water pollution
7.
Choose the correct answer: Ganga Action Plan was launched in the year _________.
A)
1975
B)
1990
C)
1980
D)
1985
8.
Fill in the Blank: _______ % of the world’s population is without safe drinking water.
9.
Fill in the Blank: ___________ gas present in stratosphere prevents UV radiations from Sun reaching the Earth.
10.
Which of these processes can not remove germs from water?
A)
Boiling
B)
Reverse Osmosis
C)
Filtration through Porous Pot
D)
Exposure to UV light
11.
Which of the following is not a source of air pollution?
A)
Power plant
B)
windmill
C)
automobile exhaust
D)
None of these
12.
State True or False: Unleaded petrol reduces release of harmful pollutants into air.
A)
true
B)
false
13.
State True or False: Acid rain increases the pH of water.
A)
true
B)
false
14.
Write four greenhouse gases.
15.
What happens when people dump wastes from homes or factories into oceans, lakes, or rivers ?
A)
It flows to other parts of the world
B)
It causes water pollution
C)
It harms plants and animals living inside
D)
Both 2 and 3
16.
Which of the following is the most dangerous and long lasting?
A)
biomedical waste
B)
nuclear waste
C)
volcano ash
D)
mining waste
17.
Write various methods used for making water suitable for drinking.
18.
State True or False: If water is filtered, it becomes free of all suspended impurities and hence potable.
A)
true
B)
false
19.
State True or False: Smog causes breathing difficulties such as asthma, cough.
A)
true
B)
false
20.
Choose the correct answer: The percentage of oxygen in the atmosphere is __________.
A)
0.78
B)
0.15
C)
0.21
D)
0.3
CBSE Class 8 Science Worksheet
Pollution of Air and Water
Answers
1.
Option D
2.
Option A
3.
Option D
4.
Option A
5.
Option B
6.
Option B
7.
Option D
8.
25
9.
Ozone
10.
Option C
11.
Option B
12.
Option A
13.
Option B
14.
Water vapour, carbon dioxide, methane and nitrous oxide.
15.
Option D
16.
Option B
17.
(i) Boiling (ii) Filtration (iii) Exposure to UV rays (iv) Reverse osmosis (v) Chlorination
18.
Option B
19.
Option A
20.
Option C
