CBSE Class 12 Biology – MCQ and Online Tests – Unit 16 – Environmental Issues
Every year CBSE conducts board exams for 12th standard. These exams are very competitive to all the students. So our website provides online tests for all the 12th subjects. These tests are also very effective and useful for those who preparing for competitive exams like NEET, JEE, CA etc. It can boost their preparation level and confidence level by attempting these chapter wise online tests.
These online tests are based on latest CBSE Class 12 syllabus. While attempting these our students can identify the weak lessons and continuously practice those lessons for attaining high marks. It also helps to revise the NCERT textbooks thoroughly.
CBSE Class 12 Biology – MCQ and Online Tests – Unit 16 – Environmental Issues
Question 1.
Acid Rain comes under which type of pollution?
(a) Water pollution
(b) Air pollution
(c) Soil pollution
(d) Sound Pollution
Answer
Answer: (c) Soil pollution
Question 2.
Bhopal gas tragedy of 1884 took place because methyl isocyanate reacted with:
(a) DDT
(b) Ammonia
(c) CO2
(d) Water
Answer
Answer: (c) CO2
Question 3.
Which chemical substance affects the Ozone Layer?
(a) Chlorofluorocarbon
(b) Chlorine
(c) Hexafluorocarbon
(d) Molecular Carbon
Answer
Answer: (a) Chlorofluorocarbon
Question 4.
Chlorofluoro carbon are responsible for:
(a) Acid rain
(b) Ozone layer depletion
(c) Global warming
(d) Thermal inversion
Answer
Answer: (d) Thermal inversion
Question 5.
Fluoride pollution mainly affect:
(a) Teeth
(b) Kidney
(c) Brain
(d) Heart
Answer
Answer: (a) Teeth
Question 6.
Environment (Protection) Act came into force in?
(a) 1986
(b) 1989
(c) 1992
(d) 1993
Answer
Answer: (c) 1992
Question 7.
In Ozone Degradation which element acts as catalyst?
(a) Chlorine
(b) Flurine
(c) Oxygen
(d) Potassium
Answer
Answer: (a) Chlorine
Question 8.
Nutrient enrichment of water bodies causes:
(a) Stratification
(b) Eutrophication
(c) Succession
(d) None of these
Answer
Answer: (b) Eutrophication
Question 9.
Ozone Layer is found in :
(a) Stratosphere
(b) Lithosphere
(c) Troposphere
(d) Hemisphere
Answer
Answer: (a) Stratosphere
Question 10.
Pollutant which causes acid rain is:
(a) SO2
(b) CO2
(c) CO
(d) Hydrocarbon
Answer
Answer: (a) SO2
Question 11.
Increased skin cancer and high mutation rate are due to:
(a) Acid Rain
(b) Ozone Depletion
(c) CO2 Pollution
(d) CO Pollution
Answer
Answer: (b) Ozone Depletion
Question 12.
Which one of the following is not a greenhouse gas?
(a) Methane
(b) CO2
(c) Chlorofluoro carbon
(d) Hydrogen
Answer
Answer: (d) Hydrogen
Question 13.
Minimata disease is caused by:
(a) ByChromium
(b) By Cadmium
(c) By Methyl mercury
(d) By Radioactive elements
Answer
Answer: (c) By Methyl mercury
Question 14.
Permissible noise levels in a residential area at night time is:
(a) 35 dB
(b) 40 dB
(c) 45 dB
(d) 50 dB
Answer
Answer: (c) 45 dB
Question 15.
A mutagenic pollutant is:
(a) Organophosphate
(b) Resines
(c) Hydrocarbons
(d) Nitrogen oxides
Answer
Answer: (c) Hydrocarbons
Question 16.
Natural air pollutant are:
(a) Pollen Grains
(b) Gases of Volcanic Eruption
(c) Aerosol
(d) Fluorides
Answer
Answer: (b) Gases of Volcanic Eruption
Question 17.
Rain is called acid rain, its pH is below:
(a) 7
(b) 6.5
(c) 6
(d) 5.6
Answer
Answer: (d) 5.6
Question 18.
Bluebaby syndrome results from:
(a) Excess of TDS
(b) Excess of DO
(c) Excess of chloride
(d) Methaemoglobin
Answer
Answer: (d) Methaemoglobin
Question 19.
Common indicator organism of water pollution is:
(a) Lemna pancicostata
(b) Eichhomia crassipes
(c) Escherichia coli
(d) Entamoeba histolytica
Answer
Answer: (c) Escherichia coli
Question 20.
Pollution of SO2 destroys:
(a) Lichen
(b) Fungi
(c) Algae
(d) Fish
Answer
Answer: (a) Lichen
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