Class XII · Biology practice
Environmental Issues PYQs Check your understanding, bookmark questions and revisit your mistakes.
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17 questions in this collection · Page 1 of 2
Environmental Issues
The thickness of ozone in a column of air in the atmosphere is measured in terms of:
A Kilobase B Dobson units C Decameter D Decibels
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Environmental Issues
Which of the following answers are NOT correct?
A The amount of some toxic substances of industrial waste water increases in the organisms at Successive trophic levels. B The micro-organisms involved in biodegradation of
organic matter in a sewage polluted water body consume a lot of oxygen causing the death of aquatic organisms. C Algal blooms caused by excess of organic matter in water improve water quality and promote fisheries. D Water hyacinth grows abundantly in eutrophic water
bodies and leads to an imbalance in the ecosystem
dynamics of the water body.
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Environmental Issues
Which of the following statements is correct?
A Algal Bloom decreases fish mortality. B Eutrophication refers to increase in domestic sewage and waste water in lakes. C Biomagnification refers to increase in concentration of the toxicant at successive trophic levels. D Presence of large amount of nutrients in water restricts 'Algal Bloom'.
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Environmental Issues
Given below are two statements:Statement I: Electrostatic precipitator is most widely used in thermal power plant.Statement II: Electrostatic precipitator in thermal power plant removes ionising radiations
A Statement I incorrect but Statement II is correct. B Both Statement I and Statement II are correct. C Both Statement I and Statement II are incorrect. D Statement I is correct but Statement II is incorrect.
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Environmental Issues
The device which can remove particulate matter present in the exhaust from a thermal power plant is :
A STP B Incinerator C Electrostatic Precipitator D Catalytic Convertor
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Environmental Issues
The entire fleet of buses in Delhi were converted to CNG from diesel. In reference to this, which one of the following statements is false?
A CNG burns more efficiently than diesel B The same diesel engine is used in CNG buses making the cost of conversion low C It is cheaper than diesel
D It cannot be adulterated like diesel
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Environmental Issues
Given below are two statements:Statement I: In a scrubber the exhaust from the thermal plant is passed through the electric wires to charge the dust particles.Statement II: Particulate matter (PM 2.5) can not be removed by scrubber but can be removed by an electrostatic precipitator.
A Both Statement I and Statement II are incorrect B Statement I is correct but Statement II is incorrect C Statement I is incorrect but Statement II is
correct D Both Statement I and Statement II are correct
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Environmental Issues
Dobson units are used to measure thickness of:
A CFCs B Stratosphere C Ozone D Troposphere
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Environmental Issues
Air (Prevention and Control of Pollution) Act was
amended in 1987 to include among pollutants:
A Vehicular exhaust B Allergy causing pollen C Noise D Particulates of size 2.5 micrometer or below
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Environmental Issues
Which of the following is put into Anaerobic sludge
digester for further sewage treatment?
A Primary sludge B Floating debris C Effluents of primary treatment D Activated sludge
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