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MCQs

Total Questions : 918 | Page 1 of 92 pages
Question 1. Pollution by particulate matter emission in the atmosphere does not take place during metal
  1.    Grinding
  2.    Machining
  3.    Cutting
  4.    Polishing
 Discuss Question
Answer: Option D. -> Polishing
Question 2. Pick out the correct statement.
  1.    Deforestation helps in controlling the green house effect
  2.    Global warming is detrimental for increase in food productivity and may cause flood and cyclone
  3.    Lightening discharges are natural source of production of SO₂ & H₂S pollutant
  4.    Sulhur dioxide causes death by asphyxiation
 Discuss Question
Answer: Option B. -> Global warming is detrimental for increase in food productivity and may cause flood and cyclone
Question 3. Main pollutant present in automobile exhaust is
  1.    CO
  2.    CO₂
  3.    NO
  4.    Hydrocarbons
 Discuss Question
Answer: Option A. -> CO
Question 4. Biological oxidation ponds remove organic matters present in the polluted water by
  1.    Using the activities of bacteria and other micro organisms
  2.    Aerobic oxidation
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B
Question 5. High noise levels produced during operation of fans and compressors can be reduced by using
  1.    Mufflers (silencers)
  2.    Accoustical absorbent
  3.    Lagging of noisy duct
  4.    None of these
 Discuss Question
Answer: Option A. -> Mufflers (silencers)
Question 6. Pick out the wrong statement.
  1.    Biological oxygen demand (B.O.D.) value of a sewerage sample is always lower than its chemical oxygen demand (C.O.D.) value
  2.    Environmental pollution by NOx emission is much higher by four stroke petrol engines as compared to the two stroke engines
  3.    Temperature in stratosphere rises with increasing altitude
  4.    The characteristic of a green house body is that it allows the long wavelength incoming solar radiation to come in but does not allow the short wavelength infra red radiation to escape out of the eart
 Discuss Question
Answer: Option D. -> The characteristic of a green house body is that it allows the long wavelength incoming solar radiation to come in but does not allow the short wavelength infra red radiation to escape out of the eart
Question 7. Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is
  1.    Inversely proportional to viscosity of gas
  2.    Proportional to the viscosity & density of the gas
  3.    Proportional to the pressure of the gas
  4.    Both B and C
 Discuss Question
Answer: Option D. -> Both B and C
Question 8. Fresh sewage is __________ in nature.
  1.    Acidic
  2.    Neutral
  3.    Alkaline
  4.    Highly acidic
 Discuss Question
Answer: Option C. -> Alkaline
Question 9. Threshold limit value (TLV) of CO in air is __________ ppm.
  1.    5
  2.    50
  3.    2000
  4.    5000
 Discuss Question
Answer: Option B. -> 50
Question 10. 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 of the above
 Discuss Question
Answer: Option D. -> All of the above

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