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 Multiple Choice QuestionsMultiple Choice Questions

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11.

Eutrophication of water bodies leading to killing of fishes is mainly due to non-availability of 

  • food

  • light

  • essential minerals

  • essential minerals

1418 Views

12.

In an area where DDT had been used extensively, the population of birds declined significantly because

  • birds stopped laying eggs

  • earthworms in the area got eradicated

  • cobras were feeding exclusively on birds

  • cobras were feeding exclusively on birds

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13.

Which one of the following is a wrong statement

  • Most of the forests have been lost in tropical areas

  • Ozone in upper part of atmosphere is harmful to animals

  • Greenhouse effect is a natural Phenomenon

  • Greenhouse effect is a natural Phenomenon

368 Views

14.

Measuring Biochemical Oxygen Demand (BOD) is a method used for

  • Estimating the amount of organic matter in sewage water

  • Working out the efficiency of oil driven automobile engines

  • Measuring the activity of Saccharomyces cerevisae in producing curd on a commercial scale

  • Measuring the activity of Saccharomyces cerevisae in producing curd on a commercial scale

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15.

The zone of atmosphere in which the ozone layer is present is called 

  • ionosphere

  • mesophere

  • stratosphere

  • stratosphere

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16.

The organisation which publishes the Red List of species is

  • ICFRE

  • IUCN

  • UNEP

  • UNEP

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17.

A scrubber in the exhaust of a chemical industrial plant removes

  • Gases like sulphur dioxide

  • Particulate matter of the size 5 micrometre or above

  • Gases like ozone and methane

  • Gases like ozone and methane

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18.

The domestic sewage in large cities

  • has a high BOD as it contains both aerobic and anaerobic bacteria

  • is processed by aerobic and then anaerobic bacteria in the secondary treatment is Sewage Treatment Plants (STPs)

  • When treated in STPs does not really require the aeration step as the sewage contains adequate adequate oxygen

  • When treated in STPs does not really require the aeration step as the sewage contains adequate adequate oxygen

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19.

The UN Conference of Parties on climate change in the year 2011 was held in

  • Poland

  • South Africa

  • Peru

  • Peru

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20.

High value of BOD (Biochemical Oxygen Demand) indicates that

  • water is pure

  • water is highly polluted

  • water is less polluted

  • water is less polluted

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