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Problem Solving Assessment(PSA)

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Question-1 The conversion of nitrogen gas into nitrates by bacteria is called:

(A) Nitrification	(B)Nitrogen fixation
(C)Denitrification	(D)Decay

Question-2 What is the origin of energy that drives the water cycle?

(A) Trees	(B)Water
(C)Mountains	(D)Sun

Question-3 The process of converting atmospheric nitrogen into nitrates is called:

(A) Nitrogen fixation	(B)Nitrogenation
(C)Nitrification	(D)DEnitrification

Question-4 The conversion of nitrates into nitrogen gas by bacteria is called:

(A) Denitrification	(B)Nitrification
(C)Nitrogen fixation	(D)Excretion

Question-5 What compounds are identified as contributing to acid rain?

(A) Carbondioxide	(B)Sulphur oxides
(C)Mercury oxides	(D)Phosphates

Question-6 Which sector is the largest emitter of greenhouse gases in India?

(A) Transport	(B)Domestic
(C)Agricultural	(D)Electric power generation

Question-7 Bacterium drives the cycle of which of the following elements?

(A) Carbon	(B)Nitrogen
(C)Oxygen	(D)Energy

Question-8 All of earth's water, land and atmosphere, within which life exists is known as:

(A) Population	(B)Community
(C)Biome	(D)Biosphere

Question-9 If excessive amounts of hot water are discharged into a lake, the immediate result will most likely be:

(A) An increase in the sewage content of the lake	(B)An increase in the amount of dissolved oxygen in the lake
(C)An increase in the amount of PCB pollution in the lake	(D)A decrease in the amount of phosphates in the lake

Question-10 Which of the following indications of the health of a water body is the most widely accepted means of measuring how polluting an effluent is?

(A) COD	(B)BOD
(C)Coliform content	(D)DO

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Std 9

CBSE

Practice in Related Chapters
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The Fundamental Unit Of Life
Diversity In Living Organisms
Why Do We Fall Ill
Natural Resources

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