Lakshya Education MCQs

Question: Scale formation in boiler is controlled by
Options:
A.Preheating of feed water
B.Reduction in hardness, silica & alumina in feed water
C.Keeping the pH value of feed water just below 7
D.Eliminating H₂S in feed water
Answer: Option B

Submit Answer & Explaination

Earn Reward Points by submitting Detailed Explaination for this Question

More Questions on This Topic :

Question 1. 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 2. Disinfection of water is done to remove
  1.    Color
  2.    Bad taste
  3.    Foul odour
  4.    Bacteria
Answer: Option D
Question 3. Which of the following pollutants is absent in the emissions from a fertiliser plant ?
  1.    SO₂ & SO₃
  2.    NO₂
  3.    NH₃
  4.    CO
Answer: Option D
Question 4. 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
  1.    CO₂
  2.    SO₂
  3.    Hydrocarbons
  4.    CFC (chloro fluoro carbon)
Answer: Option D
Question 5. 'Pneumoconiosis' is a disease caused by the inhalation of __________ dust.
  1.    Coal
  2.    Uranium ore
  3.    Iron ore
  4.    Lime
Answer: Option A
Question 6. Siderosis is a disease caused by the inhalation of __________ dust.
  1.    Coal
  2.    Silica
  3.    Iron
  4.    None of these
Answer: Option C

Check all Questions in this Topic : Click HERE