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Problem Solving Assessment(PSA)
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Question-1
Health problems related to air pollution include:
(A)
Coughing
(B)
Asthma
(C)
Bronchitis
(D)
All of these
Question-2
Over the last 100 years, global sea level has risen by about:
(A)
20-25 cm
(B)
10-12.5 cm
(C)
25-50 cm
(D)
Less than 10 cm
Question-3
In terms of a food chain or food pyramid, organisms that trap energy, such as plants are known as:
(A)
Carnivores
(B)
Primary consumer
(C)
Herbivores
(D)
Producers
Question-4
The process of converting atmospheric nitrogen into nitrates is called:
(A)
Nitrogen fixation
(B)
Nitrogenation
(C)
Nitrification
(D)
DEnitrification
Question-5
What is the pH value of acid rain?
(A)
11 - 12
(B)
3 - 6
(C)
7 -8
(D)
10 - 11
Question-6
Which of the following gases is a CFC that is used in the refrigerators?
(A)
Carbondioxide
(B)
Freon
(C)
Methane
(D)
Ammonia
Question-7
Phosphates and nitrates entering a lake cause an explosive growth of algae, this is called:
(A)
Aestivation
(B)
Mutualism
(C)
Humus
(D)
Algal bloom
Question-8
The conversion of nitrates into nitrogen gas by bacteria is called:
(A)
Denitrification
(B)
Nitrification
(C)
Nitrogen fixation
(D)
Excretion
Question-9
Which sector is the single largest consumer of fresh water in India?
(A)
Agriculture
(B)
Industry
(C)
Domestic
(D)
Power
Question-10
All of earth's water, land and atmosphere, within which life exists is known as:
(A)
Population
(B)
Community
(C)
Biome
(D)
Biosphere
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Std 9
CBSE
Practice in Related Chapters
Tissues
The Fundamental Unit Of Life
Diversity In Living Organisms
Why Do We Fall Ill
Natural Resources
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