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Environmental Issues Class 12 MCQs Questions with Answers
Solve this Environmental Issues Multiple Choice Questions of Class 12 Biology Chapter 16 MCQ, so as not to miss out on any concept from being clear about what they mean!
Multiple Choice Questions
Question 1.
Non-biodegradable pollutants are created by:
(a) nature
(b) excessive use of resources
(c) humans
(d) natural disasters.
Answer
Answer: (c) humans
Question 2.
According to the Central Pollution Control Board, particles that are responsible for causing great harm to human health are of diameter:
(a) 2.50 micrometres
(b) 5.00 micrometres
(c) 10.00 micrometres
(d) 7.5 micrometres.
Answer
Answer: (a) 2.50 micrometres
Question 3.
The material generally used for sound proofing of rooms like a recording studio and auditorium, etc. is:
(a) cotton
(b) coir
(c) wood
(d) styro foam.
Answer
Answer: (d) styro foam.
Question 4.
Compressed Natural Gas (CNG) is:
(a) propane
(b) methane
(c) ethane
(d) butane.
Answer
Answer: (b) methane
Question 5.
World’s most problematic aquatic weed is:
(a) Azolla
(b) Woiffia
(c) Eichhomia
(d) Trapa.
Answer
Answer: (c) Eichhomia
Question 6.
Which of the following causes biomagnification?
(a) SO2
(b) Mercury
(c) DDT
(d) Both B and C.
Answer
Answer: (d) Both B and C.
Question 7.
The expanded form of DDT is:
(a) dichloro diphenyl trichloroethane
(b) dichloro diethyl trichloroethane
(c) dichloro dipyrydyl trichloroethane
(d) dichloro diphenyl tetrachloroacetate.
Answer
Answer: (a) dichloro diphenyl trichloroethane
Question 8.
Which of the following material takes the longest time for biodegradations ?
(a) Cotton
(b) Paper
(c) Bone
(d) Jute.
Answer
Answer: (c) Bone
Question 9.
Choose the incorrect statement.
(a) The Montreal protocol is associated with the control of emission of ozone depleting substances.
(b) Methane and carbon dioxide are greenhouse gases.
(c) Dobson units are used to measure oxygen content.
(d) Use of incinerators is crucial to disposal of hospital wastes.
Answer
Answer: (c) Dobson units are used to measure oxygen content.
Question 10.
Among the following which one causes more indoor chemical pollution?
(a) Burning coal
(b) Burning cooking gas
(c) Burning mosquito coil
(d) Room spray.
Answer
Answer: (a) Burning coal
Question 11.
The green scum seen in the fresh water bodies is:
(a) blue green algae
(b) red algae
(c) green algae
(d) Both (a) and (c).
Answer
Answer: (d) Both (a) and (c).
Question 12.
The loudness of a sound that a person can withstand without discomfort is about
(a) 150 dB.
(b) 215 dB.
(c) 30 dB.
(d) 80 dB.
Answer
Answer: (d) 80 dB.
Question 13.
The major source of noise pollution world wide is due to:
(a) office equipment
(b) transport system
(c) sugar, textile and paper industries
(d) oil refineries and thermal power plants.
Answer
Answer: (b) transport system
Question 14.
Match correctly the following and choose the correct option.
| Column I | Column II |
| (i) Environment Protection Act | a. 1974 |
| (ii) Air Prevention a Control of Pollution Act | b. 1987 |
| (iii) Water Act | c. 1986 |
| (iv) Amendment of Air Act to include noise | d. 1981 |
The correct matches is:
(a) i-c, ii-d, iii-a, iv-b
(b) i-a, ii-c, iii-b, iv-d
(c) i-d, ii-a, iii-b, iv-c
(d) i-c, ii-d, iii-b, iv-a.
Answer
Answer: (a) i-c, ii-d, iii-a, iv-b
Question 15.
Catalytic converters are fitted into automobiles to reduce emission of harmful gases. Catalytic converters change unburnt hydrocarbons into:
(a) carbon dioxide and water
(b) carbon monoxide
(c) methane
(d) carbon dioxide and methane.
Answer
Answer: (a) carbon dioxide and water
Question 16.
Why is it necessary to remove sulphur from petroleum products?
(a) To reduce the emission of sulphur dioxide in exhaust fumes
(b) To increase efficiency of automobiles engines
(c) To use sulphur removed from petroleum for commercial purposes
(d) To increase the life span of engine silencers.
Answer
Answer: (a) To reduce the emission of sulphur dioxide in exhaust fumes
Question 17.
Which one of the following impurities is easiest to remove from waste water?
(o) Bacteria
(b) Colloids
(c) Dissolved solids
(d) Suspended solids.
Answer
Answer: (d) Suspended solids.
Question 18.
Which one of the following diseases is not due to contamination of water ?
(a) Hepatitis-B
(b) Jaundice
(c) Cholera
(d) Typhoid.
Answer
Answer: (a) Hepatitis-B
Question 19.
Nuisance growth of aquatic plants and bloom-forming algae in natural waters is generally due to high concentrations of :
(a) carbon
(b) sulphur
(c) calcium
(d) phosphorus.
Answer
Answer: (d) phosphorus.
Question 20.
Algal blooms impart a distinct colour to water due to:
(a) their pigments
(b) excretion of coloured substances
(c) formation of coloured chemicals in water facilitated by physiological degradation of algae.
(d) absorption of light by algal cell wall.
Answer
Answer: (a) their pigments
Question 21.
Match the items in column I and column II and choose the correct option:
| Column I | Column II |
| (a) UV | (i) Biomagnification |
| (b) Biodegradable Organic matter | (ii) Eutrophication |
| (c) DDT | (iii) Snow blindness |
| (d) Phosphates | (iv) BOD |
The correct matches is:
(a) a-ii, b-i, c-iv, d-iii
(b) a-iii, b-ii, c-iv, d-i
(c) a-iii, b-iv, c-i, d-ii
(d) a-iii, b-i, c-iv, d-i.
Answer
Answer: (c) a-iii, b-iv, c-i, d-ii
Question 22.
In the textbook you came across Three Mile Island and Chernobyl disasters associated with accidental leakage of radioactive wastes. In India we had Bhopal gas tragedy. It is associated with which of the following?
(a) CO2
(b) Methyl Iso-Cyanate
(c) CFCs
(d) Methy Cyanate.
Answer
Answer: (b) Methyl Iso-Cyanate
Question 23.
Match the items of column I with column II and select the correct option.
| Column I | Column II |
| (a) Electrostatic precipitator | (i) Removes gases like SO2 |
| (b) Scrubber | (ii) Reduces automobile emission |
| (c) Catalytic converter | (iii) Removes particulate matter |
(a) a -1, b – 3, c – 1
(b) a – 3, b – 2, c – 1.
(c) a – 1, b – 2, c – 3
(d) a – 3, b – 1, c – 2.
Answer
Answer: (d) a – 3, b – 1, c – 2.
Assertion and Reason Type Questions
These questions consist of two statements each, printed as Assertion and Reason. While answering these questions you are required to choose any one of the following four responses.
(a) If both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion.
(c) If Assertion is true but the Reason is false.
(d) If both Assertion and Reason are false.
Question 24.
Assertion: Agriculture production increased several times after introduction of DDT.
Reason: DDT was first insecticide used on a wide scale.
Answer
Answer: (a) If both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
Question 25.
Assertion: Suspended particulate matter (SPM) is an important pollutant released by diesel vehicles.
Reason: Catalytic converters greatly reduce pollution caused by automobiles.
Answer
Answer: (b) If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion.
Question 26.
Assertion: Inhabitants close to busy airports are likely to experience health hazards.
Reason: Sound levels of jet aeroplanes usually exceed 160 dB.
Answer
Answer: (a) If both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
Question 27.
Assertion: Deforestation is one main factor contributing to global warming.
Reason: Besides CO2, two other gases methane and CFCs are also included in GHGs.
Answer
Answer: (b) If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion.
Question 28.
Assertion: UV radiations cause photodissociation of ozone into O2 and O thus causing damage to stratospheric ozone layer.
Reason: Ozone hole is resulting due to global warming and climatic change.
Answer
Answer: (d) If both Assertion and Reason are false.
Question 29.
Assertion: Presently the global atmosphere is warming up.
Reason: The depletion of stratospheric ozone layer has resulted in increase in UV radiations reaching earth.
Answer
Answer: (b) If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion.
Question 30.
Assertion: Concentration of methane in atmosphere has more than doubled in the last 250 years.
Reason: Wetlands and rice fields are major sources of methane.
Answer
Answer: (b) If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion.
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