CBSE Questions for Class 12 Medical Biology Environmental Issues Quiz 1 - MCQExams.com

Which of these following methods is the most suitable for disposal of nuclear waste?
  • Shoot the waste into space
  • Bury the waste under Antarctic ice-cover
  • Dump the waste within rocks under deep ocean
  • Bury the waste within rocks deep below the Earth's surface
Depletion of which gas in the atmosphere can lead to an increase incidence of skin cancers?
  • Nitrous oxide
  • Ozone
  • Ammonia
  • Methane
When domestic sewage mixes with river water 
  • The river water is still suitable for drinking as impurities are only about 0.1%.
  • Small animals like rats will die after drinking river water.
  • The increased microbial activity releases micronutrients such as iron.
  • The increased microbial activity uses up dissolved oxygen.
Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodies receiving effluents from
  • Petroleum industry
  • Sugar industry
  • Domestic sewage
  • Dairy industry
High value of BOD (Biochemical Oxygen Demand) indicates 
  • Water is less polluted
  • Consumption of organic matter in the water is higher by the microbes
  • Water is pure
  • None of these
World ozone day is celebrated on __________
  • $$16^{th}$$ September
  • $$5^{th}$$ June
  • $$22^{nd}$$ April
  • $$21^{st}$$ April
Ozone in stratosphere extends
  • 10-20km
  • 20-25km
  • 15-30km
  • 25-40km
The stratospheric ozone depletion leads to?
  • Global warming
  • Increase in the incidence of skin cancers
  • Forest fires
  • All of the above
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
  • Assertion is correct but Reason is incorrect.
  • Both Assertion and Reason are incorrect.
Biological Oxygen Demand (BOD) is a measure of 
  • Industrial wastes poured into water bodies
  • Extent to which water is polluted with organic compound
  • Amount of carbon monoxide inseparably combined with haemoglobin
  • Amount of oxygen needed by green plants during night

Assertion :Presently, the global atmosphere is warming up.

Reason :The depletion of stratospheric ozone layer has resulted in increase in ultraviolet radiations reaching the earth. 
  • If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  • If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  • If the assertion is true but the reason is false
  • If both the assertion and reason are false
  • If the assertion is false but reason is true
In vehicles, catalytic converters are used
  • To increase mileage of vehicles
  • To convert $$\displaystyle { CO }_{ 2 }$$ into carbonates
  • To increase the efficiency of lead mixed petrol
  • To convert $$\displaystyle CO$$ to $$\displaystyle { CO }_{ 2 }$$
Biological Oxygen Demand (BOD) is a measure of
  • Industrial wastes poured into water bodies.
  • Extent to which water is polluted with organic compounds.
  • Amount of carbon monoxide inseparably combined with haemoglobin.
  • Amount of oxygen needed by green plants during night.
A large quantity of urban sewage is drained into nearby village river. Which among the given conditions would happen after mixing of sewage into the river?
(i) Biochemical oxygen demand (BOD) of receiving water body increases.
(ii) Dissolved oxygen of receiving water body decreases.
(iii) It will not cause mortality among fishes and other aquatic creatures.
(iv) It will lead to the nutrient enrichment of receiving water body. 
  • (i), (ii) and (iii)
  • (i), (ii) and (iv)
  • (ii) and (iii) only
  • (iii) and (iv) only
Which of the following statements is correct?
  • Catalytic converter can separate particulate matter of diameter less than 2.5 micrometers.
  • Histones are acidic in nature that form core for DNA packaging.
  • Lactobacillus is not present in dough used in idli formation.
  • Template with polarity 5' - 3' has continuous DNA replication.
According to origin, identify the secondary air pollutant.
  • $$SO_2$$
  • Ash
  • Ozone
  • Radioactive compound
Greenhouse effect is due to the presence of
  • Ozone layer in the atmosphere
  • Infrared light reaching the earth
  • Moisture layer in the atmosphere
  • CO$$_2$$ layer in the atmosphere
Decrease in species diversity in tropical countries is mainly due to
  • Urbanisation
  • Pollution
  • Deforestation
  • Soil erosion
The ozone layer in earth's atmosphere is crucial for human survival because it
  • Has ions
  • Reflects radio signals
  • Reflects ultraviolet rays
  • Reflects infrared rays
Which one is not dangerous for life and atmosphere?
  • Biopollutants
  • Ozone layer
  • Nuclear blast
  • Deforestation
Which of the following is not a greenhouse gas?
  • $$N_2O$$
  • CFC
  • $$O_3$$
  • $$SO_2$$
Among the most dangerous non-biodegradable waste is
  • cow-dung
  • plastic articles
  • garbage
  • radioactive waste
Excessive exposure of humans to UV-rays results in
  • damage to immune system
  • damage to lungs
  • skin cancer
  • peptic ulcers
Which of the following organism is likely to have more concentration of D.D.T in its body?
  • Herbivores
  • Carnivores
  • Top carnivores
  • Primary producers
The result of ozone hole is
  • Acid rain
  • UV radiations reach the surface of earth
  • Global warming
  • Green house effect
.................. has destructive effects on the entire ecosystem.
  • Radioactive pollution
  • Noise pollution
  • Soil pollution
  • Water pollution
What does e-waste stand for? 
  • environment Waste
  • electronic Waste
  • equipment Waste
  • All of the above
In which of the following year, the depletion of the ozone layer have been noticed?
  • 1979
  • 1980
  • 1981
  • 1982
Discarded electronic items are categorized under
  • Industrial waste
  • Domestic waste
  • Hazardous waste
  • Electronic waste
______ can cause sea levels to rise dramatically.
  • Global warming
  • Rock slide
  • Water pollution
  • Air pollution
What happen when the destruction of the ozone layer increases?
  • The amount of harmful ultraviolet radiation
  • The amount of needful ultraviolet radiation
  • The amount of ultra radiations
  • None of these
What is e-waste?
  • Hazardous chemical waste
  • Waste electronic equipment
  • Waste from nuclear power generation
  • Environmental friendly waste
What is the toxic substance contained by typical electronic waste?
  • PCBs
  • Dioxin
  • Pesticide-like compounds
  • Heavy metals
Different examples of waste are
  • Electronic waste
  • Waste water
  • Hazardous waste
  • All of the above

What is the single greatest source of solid waste?
  • Mining
  • Municipalities
  • Agriculture
  • Industry
Which of the following reduce(s) air pollution?
(i) Using an incinerator
(ii) Using renewable energy
(iii) Fixing catalytic converters in vehicles
  • Only (i)
  • (ii) and (iii)
  • (i) and (iii)
  • (i), (ii) and (iii)
Ozone is present as a chief constituent in which region of the atmosphere?
  • Troposphere
  • Stratosphere
  • Mesosphere
  • Thermosphere
Depending upon the amount of radioactivity, there are ........ type of radioactive waste
  • Two
  • Five
  • Four
  • Six
Which of the following is used to treat radioactive waste?
  • Ammonia to neutralize it
  • Bacteria to consume it
  • Storage until it gets harmless
  • Acid to decompose it
Which of the following cause green house effect?
(i) Deforestation
(ii) Emission of gases from factories
(iii) Melting of polar ice
  • Only (i) and (ii)
  • Only (i) and (iii)
  • Only (ii) and (ii)
  • (i), (ii) and (iii)
Waste from hospitals are known as 
  • Industrial waste
  • Biomedical waste
  • Biomagnification
  • Eutrophication
What does bioaccumulation mean?
  • Accumulation of substance
  • Absorption of substance
  • Accommodation of substance
  • None of these
Growing more trees would .....
  • Increase noise pollution.
  • Decrease noise pollution.
  • Have no effect on noise pollution.
  • Reduce noise pollution to zero.
Which country produces the most e-waste per year?
  • Britain
  • China
  • India
  • USA
Nuclear wastes are rich in
  • Radioactive material
  • Electronic material
  • Carbon dioxide
  • None of the above
Organic farming is raising crops through use of
  • Biofertilizers
  • Manures
  • Resistant varieties
  • All of the above
Extensive planting of trees to increase forest cover is called
  • Afforestation
  • Agroforestry
  • Deforestation
  • Social forestry
Pallavi got PUC certificate for her vehicle which indicates which of the following criteria for the vehicle?
  • It has low rate of emission
  • It is equipped with new technology
  • It has greater fuel capacity
  • None of the above
Plants remove carbon in the form of:
  • Carbonates
  • Carbon monoxide
  • Bicarbonates
  • Carbon dioxide
Cyclone collectors and electrostatic precipitators are meant for controlling.
  • Sewage pollution
  • Air pollution
  • Pesticide pollution
  • Natural pollution
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