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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 minerals are found in the run-off from agricultural land and un-treated sewage effluents that are responsible for eutrophication of water bodies?
(A)
Phosphorous and carbon
(B)
Nitrogen and phosphorus
(C)
Potassium and arsenic
(D)
Iron and manganese
Question-3
The process of photosynthesis and respiration cause the cycling of which element in the environment?
(A)
Carbon
(B)
Water
(C)
Nitrogen
(D)
Hydrogen
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 single largest consumer of fresh water in India?
(A)
Agriculture
(B)
Industry
(C)
Domestic
(D)
Power
Question-6
The process by which water vapor changes to liquid form is called:
(A)
Condensation
(B)
Evaporation
(C)
Transpiration
(D)
Precipitation
Question-7
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-8
Water is listed as one of the basic:
(A)
Solid forms of matter
(B)
Nutrients of cool-aid
(C)
Needs of animals and plants.
(D)
Unit of life
Question-9
Which of the following pollutants is not present in the vehicular exhaust emissions?
(A)
Lead
(B)
Ammonia
(C)
Carbon monoxide
(D)
Particulate matter
Question-10
The process of converting atmospheric nitrogen into nitrates is called:
(A)
Nitrogen fixation
(B)
Nitrogenation
(C)
Nitrification
(D)
DEnitrification
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Std 9
CBSE
Practice in Related Chapters
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