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Problem Solving Assessment(PSA)

Question-1 What is acid rain?

(A) The rain of acids	(B)Evaporation of acids from the industries
(C)Rain water containing dissolved acids	(D)Acidic particles

Question-2 Water harvesting is:

(A) Collection of river water	(B)Collection of rainwater in storage tanks or in the soil to recharge ground water
(C)Harvesting of water from tube wells	(D)All the above

Question-3 Some bacteria have the ability to 'fix' nitrogen. This means:

(A) They convert ammonia into nitrites and nitrates	(B)They break down useful nitrogen-rich compounds and release ammonium ions
(C)They convert nitrates into nitrogen gas	(D)They convert atmospheric nitrogen gas into biologically useful forms of nitrogen

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

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

Question-5 The process by which water vapor changes to liquid form is called:

(A) Condensation	(B)Evaporation
(C)Transpiration	(D)Precipitation

Question-6 Which sector is the single largest consumer of fresh water in India?

(A) Agriculture	(B)Industry
(C)Domestic	(D)Power

Question-7 Which sector is the largest emitter of greenhouse gases in India?

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

Question-8 What is the origin of energy that drives the water cycle?

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

Question-9 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-10 Health problems related to air pollution include:

(A) Coughing	(B)Asthma
(C)Bronchitis	(D)All of these

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Std 9

CBSE

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