Railways General Science & Technology Pollution of Air and Water Sample Paper

done Water Pollution Sample Test Paper-21 Total Questions - 20    [Download]

• question_answer1)
  Biological oxygen demand of____ is the least.
  A)
   Sewage
  done clear
  B)
   sea water
  done clear
  C)
   Pure water       
  done clear
  D)
   polluted water
  done clear
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• question_answer2)
  Due to eutrophication____.
  A)
   BOD increases
  done clear
  B)
          BOD decreases
  done clear
  C)
   Algae are destroyed       
  done clear
  D)
   Water becomes less harmful
  done clear
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• question_answer3)
  ______ is the first step of sewage treatment.
  A)
   Precipitation     
  done clear
  B)
   Chlorination
  done clear
  C)
   Sedimentation
  done clear
  D)
          Aeration
  done clear
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• question_answer4)
  Which of the following is not an environmental problem?
  A)
   Wastage of water
  done clear
  B)
   Conservation of water
  done clear
  C)
   Deforestation
  done clear
  D)
   Land erosion
  done clear
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• question_answer5)
  BOD is ______ in polluted water and ______ in potable water.
  A)
   More, less        
  done clear
  B)
   less, medium
  done clear
  C)
   Medium, more
  done clear
  D)
   less, more
  done clear
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• question_answer6)
  BOD/COD ratio will always be:
  A)
   Equal to 1        
  done clear
  B)
   Less than 1
  done clear
  C)
   More than 1     
  done clear
  D)
   none of them
  done clear
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• question_answer7)
  Biochemical Oxygen Demand measures
  A)
   Industrial pollution
  done clear
  B)
   Air pollution
  done clear
  C)
   Soil pollution
  done clear
  D)
   Dissolved \[{{O}_{2}}\] needed by microbes to decompose organic waste.
  done clear
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• question_answer8)
  Excess fluoride in drinking water is likely to cause:
  A)
   Blue baby syndrome
  done clear
  B)
   Fluorosis
  done clear
  C)
   Change in taste and odour
  done clear
  D)
   Intestinal irritation
  done clear
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• question_answer9)
  Fluoride pollution mainly affects:
  A)
   Kidney 
  done clear
  B)
   Brain
  done clear
  C)
   Heart  
  done clear
  D)
   Teeth
  done clear
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• question_answer10)
  Which of the following is-a non-point source of water pollution?
  A)
   Factories
  done clear
  B)
   Sewage treatment plants
  done clear
  C)
   Urban and suburban lands
  done clear
  D)
   All of the above
  done clear
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• question_answer11)
  Septic tank is:
  A)
   An aerobic attached growth treatment system
  done clear
  B)
   An aerobic suspended growth biological treatment system
  done clear
  C)
   An anaerobic attached growth biological treatment system
  done clear
  D)
   An anaerobic suspended growth treatment system
  done clear
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• question_answer12)
  Disease caused by eating fish inhabiting mercury contaminated water is:
  A)
   Bright's disease
  done clear
  B)
          Hiroshima episode
  done clear
  C)
   Mina-mata disease
  done clear
  D)
   Osteosclerosis
  done clear
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• question_answer13)
  Which of the following is not a marine pollutant?
  A)
   Oil                  
  done clear
  B)
   Plastics
  done clear
  C)
   Dissolved oxygen
  done clear
  D)
   All of the above
  done clear
  View Answer play_arrow

• question_answer14)
  Which of the following is a major source of thermal pollution in water bodies?
  A)
   Sewage treatment plant
  done clear
  B)
   Solid waste disposal sites
  done clear
  C)
   Thermal power plant
  done clear
  D)
   All of the above
  done clear
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• question_answer15)
  In B.O.D. test oxygen plays an important role to
  A)
   Destroy inorganic matter
  done clear
  B)
   Destroy pollution
  done clear
  C)
   Destroy waste organic matter
  done clear
  D)
   None of these
  done clear
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• question_answer16)
  BOD stands for
  A)
   Biological organism death
  done clear
  B)
   Biochemical organic matter decay
  done clear
  C)
   Biotic oxidation demand
  done clear
  D)
   Biochemical oxygen demand
  done clear
  View Answer play_arrow

• question_answer17)
  Fishes die by sewage because
  A)
   Of its bad smell
  done clear
  B)
   It replaces food material of fishes
  done clear
  C)
   It increases oxygen competition among fishes
  done clear
  D)
   \[C{{O}_{2}}\]is mixed in large amount in water
  done clear
  View Answer play_arrow

• question_answer18)
  Which of the following metal is a water pollutant and causes sterility in human being
  A)
   As                   
  done clear
  B)
   Mn
  done clear
  C)
   Mg                  
  done clear
  D)
   Hg
  done clear
  View Answer play_arrow

• question_answer19)
  Eutrophication is caused by
  A)
   Acid rain
  done clear
  B)
   Nitrates and phosphates
  done clear
  C)
   Sulphates and carbonates
  done clear
  D)
   \[C{{O}_{2}}\]and \[CO\]
  done clear
  View Answer play_arrow

• question_answer20)
  A lake with an inflow of domestic sewage rich in organic waste may result in
  A)
   Drying of the lake very soon due to algal bloom
  done clear
  B)
   An increase production of fish due to lot of nutrients
  done clear
  C)
   Death of fish due to lack of oxygen
  done clear
  D)
   Increased population of aquatic food web organisms:
  done clear
  View Answer play_arrow