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Environmental Issues · Question 35

AIPMT 2015 (Cancelled)MCQMedium📈 Topic in 12% papers+4−1
1

High value of BOD (Biochemical Oxygen Demand) indicates that :

  1. water is highly polluted
  2. consumption of organic matter in the water is higher by the microbes
  3. water is pure
  4. water is less polluted

Answer

(2) consumption of organic matter in the water is higher by the microbes

Solution

As per NCERT, BOD refers to the amount of oxygen that would be consumed if all the organic matter in one litre of water were oxidised by bacteria (microbes).

⇒ A high BOD means the microbes consume (decompose) more organic matter in the water, using up more dissolved oxygen.

∴ High value of BOD indicates that consumption of organic matter in the water by the microbes is higher (such water has a high polluting potential).

Answer: (2)

Out of syllabusAIPMT 2015 (Cancelled)

Keep practising — Environmental Issues

2

Rachel Carson's famous book "Silent Spring" is related to:

  1. Population explosion
  2. Pesticide pollution
  3. Ecosystem management
  4. Noise pollution
Out of syllabusAIPMT 2015 (Cancelled)
3

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

  1. Mesosphere
  2. Stratosphere
  3. Ionosphere
  4. Troposphere
Out of syllabusAIPMT 2014
4

A scrubber in the exhaust of a chemical industrial plant removes :

  1. particulate matter of the size 5 micrometer or above
  2. particulate matter of the size 2.5 micrometer or less
  3. gases like ozone and methane
  4. gases like sulphur dioxide
Out of syllabusAIPMT 2014
5

Kyoto-Protocol was endorsed at :

  1. CoP-6
  2. CoP-4
  3. CoP-3
  4. CoP-5
Out of syllabusNEET 2013
6

Global warming can be controlled by :

  1. Increasing deforestation, slowing down the growth of human population
  2. Reducing deforestation, cutting down use of fossil fuel
  3. Increasing deforestation, reducing efficiency of energy usage
  4. Reducing reforestation, increasing the use of fossil fuel
Out of syllabusNEET 2013
7

The Air (Prevention and Control of Pollution) Act came into force in :

  1. 1985
  2. 1981
  3. 1990
  4. 1975
Out of syllabusNEET 2013
8

The second commitment period for Kyoto Protocol was decided at :

  1. Doha
  2. Cancun
  3. Durban
  4. Bali
Out of syllabusNEET 2013 (Karnataka)
9

Climate of the world is threatened by :

  1. Decreasing amount of atmospheric carbon dioxide
  2. Increasing concentration of atmospheric oxygen
  3. Decreasing amount of atmospheric oxygen
  4. Increasing amount of atmospheric carbon dioxide
Out of syllabusNEET 2013 (Karnataka)
10

Which one of the following is not correct as regards the harmful effects of particulate matter of the size 2.5 micrometers or less?

  1. It can directly enter into our circulatory system
  2. It can be inhaled into the lungs
  3. It can cause respiratory problems
  4. It can cause inflammation and damage to the lungs
Out of syllabusNEET 2013 (Karnataka)
11

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

  1. Earthworms in the area got eradicated
  2. Cobras were feeding exclusively on birds
  3. Birds stopped laying eggs
  4. Many of the birds' eggs laid did not hatch
Out of syllabusAIPMT 2012 (Prelims)

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