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Problem Solving Assessment(PSA)

Question-1 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-2 What compounds are identified as contributing to acid rain?

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

Question-3 Which sector is the single largest consumer of fresh water in India?

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

Question-4 The process by which water vapor changes to liquid form is called:

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

Question-5 The process of converting atmospheric nitrogen into nitrates is called:

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

Question-6 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-7 What is the main source of water pollution in India?

(A) Municipal sewage	(B)Domestic discharge
(C)Industrial discharge	(D)Both 1 and 3

Question-8 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-9 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-10 Which of the following processes is involved in the water cycle?

(A) Evaporation, hibernation and dehydration	(B)Evaporation, condensation, and precipitation
(C)Padding, swimming and drinking	(D)Bathing, sunning and drinking

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Std 9

CBSE

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