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Problem Solving Assessment(PSA)
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Question-1
Which of the following gases is a CFC that is used in the refrigerators?
(A)
Carbondioxide
(B)
Freon
(C)
Methane
(D)
Ammonia
Question-2
Which of the following human activities has added the most carbon to the atmosphere?
(A)
Burning fossil fuels
(B)
Mining fossil fuels
(C)
Increasing soil erosion
(D)
Respiration
Question-3
What is the pH value of acid rain?
(A)
11 - 12
(B)
3 - 6
(C)
7 -8
(D)
10 - 11
Question-4
Which of the following are floating ocean plants or animals?
(A)
Plankton
(B)
Benthes
(C)
Terrenus
(D)
Microbes
Question-5
Which sector is the largest emitter of greenhouse gases in India?
(A)
Transport
(B)
Domestic
(C)
Agricultural
(D)
Electric power generation
Question-6
The conversion of nitrates into nitrogen gas by bacteria is called:
(A)
Denitrification
(B)
Nitrification
(C)
Nitrogen fixation
(D)
Excretion
Question-7
Which of the following pollutants is not present in the vehicular exhaust emissions?
(A)
Lead
(B)
Ammonia
(C)
Carbon monoxide
(D)
Particulate matter
Question-8
Bhopal gas tragedy struck in the year 1984 due to the leakage of:
(A)
Methyl-isocyanate
(B)
Nitrous oxide
(C)
Methane
(D)
Carbon monoxide
Question-9
The process of converting atmospheric nitrogen into nitrates is called:
(A)
Nitrogen fixation
(B)
Nitrogenation
(C)
Nitrification
(D)
DEnitrification
Question-10
Bacterium drives the cycle of which of the following elements?
(A)
Carbon
(B)
Nitrogen
(C)
Oxygen
(D)
Energy
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Std 9
CBSE
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