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MCQs

Total Questions : 579 | Page 5 of 58 pages
Question 41. Photochemical smog is formed from automobile exhaust
  1.    by reaction of hydrocarbon & nitric oxide in presence of sunlight.
  2.    appears only on sunny days.
  3.    is harmful for crops and trees also besides causing eye irritation & asthma.
  4.    all (a), (b) & (c)
 Discuss Question
Answer: Option D. -> all (a), (b) & (c)
Answer: (d).all (a), (b) & (c)
Question 42. Reinglemann chart is used for the measurement of the
  1.    combustibles present in automobile exhaust.
  2.    smoke density from a chimey.
  3.    exhaust gas density.
  4.    flue gas temperature.
 Discuss Question
Answer: Option B. -> smoke density from a chimey.
Answer: (b).smoke density from a chimey.
Question 43. Which of the following fine dust removal equipments is the most efficient ?
  1.    Bag filter
  2.    Scrubber
  3.    Electrostatic precipitator
  4.    Cyclone separator
 Discuss Question
Answer: Option C. -> Electrostatic precipitator
Answer: (c).Electrostatic precipitator
Question 44. Disinfection of water is done to remove
  1.    color
  2.    bad taste
  3.    foul odour
  4.    bacteria
 Discuss Question
Answer: Option D. -> bacteria
Answer: (d).bacteria
Question 45. The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel.
  1.    1
  2.    5
  3.    10
  4.    20
 Discuss Question
Answer: Option A. -> 1
Answer: (a).1
Question 46. Polyvinyl chloride containers are not suitable for storing
  1.    foodstuffs
  2.    woolen clothes
  3.    metallic powder
  4.    none of these
 Discuss Question
Answer: Option A. -> foodstuffs
Answer: (a).foodstuffs
Question 47. Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N₂ in contaminated air at which it acts as a natural asphyxant is ≥ __________ percent.
  1.    84
  2.    88
  3.    80
  4.    92
 Discuss Question
Answer: Option A. -> 84
Answer: (a).84
Question 48. TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.
  1.    5
  2.    100
  3.    1000
  4.    2000
 Discuss Question
Answer: Option A. -> 5
Answer: (a).5
Question 49. Water filtration rate in a slow sand filter ranges from __________ litres/m²/hr.
  1.    10 to 20
  2.    100 to 200
  3.    1500 to 2500
  4.    4000 to 5000
 Discuss Question
Answer: Option B. -> 100 to 200
Answer: (b).100 to 200
Question 50. Corrosion in boilers can be prevented by
  1.    deaeration of feed water.
  2.    enhancing pH of feed water by adding alkali.
  3.    feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion.
  4.    all (a), (b) and (c).
 Discuss Question
Answer: Option D. -> all (a), (b) and (c).
Answer: (d).all (a), (b) and (c).

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