Multiple Choice Questions 10×1=10
1
Concentration of which gas in the atmosphere is decreased by photosynthesis in plants?
A
Oxygen
B
Nitrogen
C
Carbon dioxide
D
Water vapours
2
People of which age groups are most affected by air pollution?
A
Young adults
B
Middle age people
C
Children
D
Both children and aged people
3
Layers of atmosphere are:
A
Four
B
Five
C
Three
D
Two
4
Mixture of gases around earth is called:
A
Lithosphere
B
Biosphere
C
Atmosphere
D
Hydrosphere
5
Range of stratosphere is:
A
0–12
B
12–50
C
50–85
D
85–120
6
All aircraft fly in:
A
Troposphere
B
Stratosphere
C
Mesosphere
D
Thermosphere
7
There are …… types of harmful substances which account for 90% of air pollution.
Hint: Think about major air pollutants like CO, SO₂, NOx, etc.
A
Seventeen
B
Seven
C
Six
D
Ten
8
Which gas can cause health problem during breathing process?
A
Ozone
B
Methane
C
CO₂
D
O₂
9
Which acid is the reason of acid rain?
A
H₂SO₄
B
HCl
C
CH₃COOH
D
HCOOH
10
Historical building Parthenon is in:
A
Japan
B
Singapore
C
UK
D
Greece
Short Answer Questions 15×2=30
1
In what way sulphur present in fossil fuels becomes dangerous?
2
How does acid rain affect forests?
3
Write down the composition of dry air.
4
Define pollutants. Give its types.
5
What are air pollutants? Give examples.
6
Define smog. Write its effects.
Hint: Smog = Smoke + Fog. Consider industrial and vehicle emissions.
7
What is the effect of carbon monoxide?
8
Define Acid rain. How is it formed?
SO2 + H2O → H2SO3
NO2 + H2O → HNO3 + HNO2
9
What is acid rain? Write its pH.
10
What do you know about Robert Angus Smith?
11
What are the causes of acids?
12
Write down two effects of acids.
13
How is the excessive use of insecticides and pesticides harmful for birds?
14
Which gas is released when carbonated drinks open? Exercise
15
When SO₂ and NO₂ are dissolved in water, which acids are formed? Exercise