8th Class Science Pollution of Air and Water Question Bank

done Pollution of Air and Water Total Questions - 20

• question_answer1)
  Consider the following statements and select the option which correctly identifies true (T) and false (F) ones.

  (i) Scrubbers are used to remove suspended particulate matter from factories.

  (ii) Excess carbon monoxide present in the atmosphere traps a lot of heat and leads to warming of Earth's surface.

  (iii) The suspended particulate matter present in the air is known as aerosol.

  (iv) Kyoto protocol was signed to reduce the emission of greenhouse gases.

   
  A)

  (i)	(ii)	(iii)	(iv)
  T	F	T	F

    done clear
  B)

  (i)	(ii)	(iii)	(iv)
  T	F	F	T

    done clear
  C)

  (i)	(ii)	(iii)	(iv)
  F	F	T	T

    done clear
  D)

  (i)	(ii)	(iii)	(iv)
  T	F	T	T

    done clear
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• question_answer2)
  The overuse of fertilisers in a farm results in the runoff pollution of nearby river. Which of the following graphs correctly represents the resulting changes in the levels of oxygen and bacteria in that river?
  A)
  done clear
  B)
  done clear
  C)
  done clear
  D)
         done clear
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• question_answer3)
  Trees are planted along the roadside to reduce pollution from motor vehicles. How do trees help to reduce pollution?

  (i)  They absorb traffic noise.

  (ii) They take in carbon dioxide.

  (iii) They trap dust and soot from the exhaust pipes of vehicles.

  A)
  (i) and (ii) only done clear
  B)
  (ii) and (iii) only done clear
  C)
  (i) and (iii) only done clear
  D)
  (i), (ii) and (iii) done clear
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• question_answer4)
  Which of the containers shown below will continue to have healthy fish and plants at the end of a week?
  A)
        done clear
  B)
  done clear
  C)
           done clear
  D)
           None of these done clear
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• question_answer5)
  Which of the following statements about eutrophication is/are correct?

  (i)  It increases the amount of sunlight reaching the bottom of the water body.

  (ii) It occurs due to excessive enrichment of the water in river and lakes.

  (iii) It results in decrease in water clarity, dissolved oxygen and aquatic life.

  A)
  (ii) only                        done clear
  B)
  (i) and (iii) only                        done clear
  C)
  (ii) and (iii) only           done clear
  D)
  (i), (ii) and (iii) done clear
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• question_answer6)
  Read the given statements and select the correct option.

  Statement 1: Carbon dioxide helps in maintaining temperature of the Earth.

  Statement 2: Carbon dioxide traps heat of the reflected infrared radiations and stops heat from escaping the Earth's surface.

   
  A)
  Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. done clear
  B)
  Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. done clear
  C)
  Statement 1 is true but statement 2 is false. done clear
  D)
  Both statements 1 and 2 are false. done clear
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• question_answer7)
  Which of the following statements is incorrect?
  A)
  Suspended particulate matter can lead to respiratory problems like bronchitis and asthma. done clear
  B)
  Acid rain is mainly constituted by \[\text{S}{{\text{O}}_{\text{2}}}\]and \[\text{N}{{\text{O}}_{\text{2}}}\]. done clear
  C)
  CNG is called a cleaner fuel as it burns completely. done clear
  D)
  Major greenhouse gases are CFCs. and hydrocarbons only. done clear
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• question_answer8)
  Select the pair of diseases that are caused by contaminated water.
  A)
  Cholera and typhoid done clear
  B)
  Diarrhoea and common cold done clear
  C)
  Pneumonia and typhoid done clear
  D)
  Malaria and pneumonia done clear
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• question_answer9)
  Air pollutants are harmful to living things. Which of the following is/are their harmful effect(s)?

  (i)  They form acid rain.

  (ii) They cause breathing problems in humans.

  (iii) They interfere with photosynthesis in plants.

  (iv) They result in the depletion of ozone layer.

   
  A)
  (i) only done clear
  B)
  (i) and (ii) only done clear
  C)
  (i), (ii) and (iii) only done clear
  D)
  (i), (ii), (iii) and (iv) done clear
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• question_answer10)
  Study the given Venn diagram. X is likely to be ________.
  A)
  A group of people smoking cigarettes done clear
  B)
  Youngsters dancing in disco done clear
  C)
  A farmer spraying pesticides near a river done clear
  D)
  Construction work going on at a building site done clear
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• question_answer11)
  Study the given flow chart and identify P, Q and R.
  A)

  P	Q	R
  Livestock wastes	Styrofoam cup	DDT

                  done clear
  B)

  P	Q	R
  Garbage	BHC	Aluminium cans

                  done clear
  C)

  P	Q	R
  Sewage sludge	DDT	Styrofoam cup

                  done clear
  D)

  P	Q	R
  Livestock wastes	BHC	Grocery

  done clear
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• question_answer12)
  Which of the following graphs shows the likely relationship between the percentage of pollution to the population of people in a particular town?
  A)
    done clear
  B)
  done clear
  C)
    done clear
  D)
  done clear
  View Solution play_arrow

• question_answer13)
  The 'greenhouse effect' refers to the
  A)
  Building up of pollution in the atmosphere done clear
  B)
  Gradual warming of the Earth's atmosphere done clear
  C)
  Hole in the ozone layer done clear
  D)
  Increase in human population on Earth done clear
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• question_answer14)

  Refer to the given food web.

  If a non-biodegradable insecticide known as DDT was sprayed onto the pine tree, in which of the following organisms will most of the DDT eventually accumulate?

   
  A)
  Golden-crowned kinglet done clear
  B)
  Snake done clear
  C)
  Red-tailed hawk done clear
  D)
  Oak acorns done clear
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• question_answer15)
  Match column I with column II and select the correct option from the codes given below.

  Column I	Column II
  (a) Carbon dioxide in air	(i) Damage ozone layer
  (b) Sulphur dioxide in air	(ii) Produces acid rain
  (c) Chlorofluorocarbons	(iii) Prevents photosynthesis
  (d) Dust in air	(iv) leads to gloabal warming

  A)
  (a) - (iv); (b) - (ii); (c) - (i); d - (iii) done clear
  B)
  (a) - (iii); (b) - (iv); (c) - (ii); d - (i) done clear
  C)
  (a) - (i); (b) - (ii); (c) - (iv); d - (iii) done clear
  D)
  (a) - (i); (b) - (iii); (c) - (iv); d - (ii) done clear
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• question_answer16)
  An oil spill covered a large area of water in an ocean. The marine life in that area was badly affected. A lot of marine animals were found dead and floating on the surface of the water. This is because ________.

  (i) They drank the water that was contaminated by the oil

  (ii) The fish swallowed the oil and were poisoned

  (iii) They breathed in the oil fumes near the water surface and were suffocated

  A)
  (ii) only                        done clear
  B)
  (i) and (ii) only done clear
  C)
         (ii) and (iii) only           done clear
  D)
  (i), (ii) and (iii) done clear
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• question_answer17)
  Following are the steps of purification of water.

  (i) Water collected from the river is made free of large pieces of dirt and pumped into reservoirs.

  (ii) Water is passed through filter beds.

  (iii) Water is stirred in a flocculation tank.

  (iv) Water is allowed to stand in large tanks.

  (v) Water is chlorinated.

  (vi) Filtered water is stored.

  (vii) Water is supplied to homes and factories by huge water mains.

  Select the option which arrange the steps in correct sequence.
  A)
  (i)\[\to \](iii)\[\to \](iv)\[\to \](ii)\[\to \](v)\[\to \](vi)\[\to \](vii) done clear
  B)
  (i)\[\to \](iv)\[\to \](ii)\[\to \](iii)\[\to \](vi)\[\to \](v)\[\to \](vii) done clear
  C)
  (i)\[\to \](iv)\[\to \](iii)\[\to \](ii)\[\to \](v)\[\to \](vi)\[\to \](vii) done clear
  D)
  (i)\[\to \](ii)\[\to \](iv)\[\to \](v)\[\to \](iii)\[\to \](vi)\[\to \](vii) done clear
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• question_answer18)
  The events which occur in the water body after it has been polluted by fertilisers are given as follows :

  (i) Submerged algae perish

  (ii) Water plants undergo sudden proliferation

  (iii) Consumers such as fish die

  (iv) Oxygen levels fall

  (v) Bacteria act on the increased number of dead organisms.

  Arrange them in a correct sequence.
  A)
  (ii)\[\to \](i)\[\to \](iii)\[\to \](v)\[\to \](iv) done clear
  B)
  (iii)\[\to \](iv)\[\to \](i)\[\to \](ii)\[\to \](v) done clear
  C)
  (ii)\[\to \](i)\[\to \](v)\[\to \](iv)\[\to \](iii) done clear
  D)
  (i)\[\to \](iv)\[\to \](v)\[\to \](iii)\[\to \](ii) done clear
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• question_answer19)
  As proved by many studies greenhouse effect is rapidly increasing because of increase in concentration of carbon dioxide. In the given graph the increase in carbon dioxide concentration is shown. What could be X corresponding to it?

  (i) Rate of photosynthesis in plants

  (ii) pH of the oceans

  (iii) Water level of ocean

  (iv) Average global temperature of Earth

   
  A)
  (i) and (iii) only            done clear
  B)
  (ii) and (iv) only           done clear
  C)
  (ii) only            done clear
  D)
  (iv) only done clear
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• question_answer20)
  Which of the following are possible advantages of using bacteria in sewage treatment?

  (i)  Bacteria multiply quickly, thus producing a cheap and abundant source of enzymes.

  (ii) Only one type of bacteria is required to provide the various enzymes necessary for different kinds of wastes.

  (iii) Bacteria can break down waste under anaerobic or aerobic condition.

  A)
  (i) only             done clear
  B)
  (i) and (iii) only            done clear
  C)
  (ii) and (iii) only           done clear
  D)
  (i), (ii) and (iii) done clear
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