Lakshya Education MCQs

  1. Topics
  2. Chemical Engineering
  3. Environmental Engineering In Ce
Question: Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of
Options:
A.CO₂
B.SO₂
C.Hydrocarbons
D.CFC (chloro fluoro carbon)
Answer: Option D

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Question 1. Scale formation in boiler is controlled by
  1.    Preheating of feed water
  2.    Reduction in hardness, silica & alumina in feed water
  3.    Keeping the pH value of feed water just below 7
  4.    Eliminating H₂S in feed water
Answer: Option B
Question 2. Pick out the wrong statement.
  1.    Catalytic converter is fitted in automobiles to reduce carbon monoxide concentration in exhaust emissions
  2.    Inhalation of pollutant carbon monoxide results in death by asphyxiation
  3.    Sulphur dioxide is the main pollutant emitted from the exhaust of petrol driven automobiles
  4.    Decomposition of plants containing chlorophyll is a natural source of carbon monoxide in atmosphere
Answer: Option C
Question 3. Disinfection of water is done to remove
  1.    Color
  2.    Bad taste
  3.    Foul odour
  4.    Bacteria
Answer: Option D
Question 4. 'Pneumoconiosis' is a disease caused by the inhalation of __________ dust.
  1.    Coal
  2.    Uranium ore
  3.    Iron ore
  4.    Lime
Answer: Option A
Question 5. Siderosis is a disease caused by the inhalation of __________ dust.
  1.    Coal
  2.    Silica
  3.    Iron
  4.    None of these
Answer: Option C
Question 6. The widest explosive limit is of __________ , thereby making it the most explosive gas.
  1.    Acetylene
  2.    Petrol vapor
  3.    Hydrogen
  4.    Carbon monoxide
Answer: Option A

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