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MCQs

Total Questions : 579 | Page 4 of 58 pages
Question 31. Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels.
  1.    85
  2.    105
  3.    125
  4.    145
 Discuss Question
Answer: Option B. -> 105
Answer: (b).105
Question 32. In troposphere (the weather domain), the temperature 't' at height 'h' above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)
  1.    t = 15 - 0.0065h
  2.    t = 15 + 0.0065h
  3.    t = 0.0035h -15
  4.    t = 15 - 0.0035h
 Discuss Question
Answer: Option A. -> t = 15 - 0.0065h
Answer: (a).t = 15 - 0.0065h
Question 33. Solid content in most of the domestic sewage is about __________ percent.
  1.    0.001
  2.    0.1
  3.    5
  4.    10
 Discuss Question
Answer: Option B. -> 0.1
Answer: (b).0.1
Question 34. Inhalation of silica dust causes a disease called
  1.    bronchitis
  2.    silicosis
  3.    pneumoconiosis
  4.    none of these
 Discuss Question
Answer: Option B. -> silicosis
Answer: (b).silicosis
Question 35. Pick out the wrong statement.
  1.    Benzopyrene which causes cancer is present in traces in tobacco, charcoal & petrol driven automobile exhaust.
  2.    NO₂ is capable of penetrating the troposphere and can absorb both ultraviolet & visible light.
  3.    Hydrocarbon pollutants are produced by sweet gum, oak & natural rubber trees.
  4.    H₂S is not at all produced during combustion of sulphur bearing fuels as all the sulphur is oxidised to SO₂.
 Discuss Question
Answer: Option D. -> H₂S is not at all produced during combustion of sulphur bearing fuels as all the sulphur is oxidised to SO₂.
Answer: (d).H₂S is not at all produced during combustion of sulphur bearing fuels as all the sulphur is oxidised to SO₂.
Question 36. Which of the following acts as a natural source of air pollution ?
  1.    Forest fire
  2.    Deforestation
  3.    Volcanic eruption
  4.    None of these
 Discuss Question
Answer: Option C. -> Volcanic eruption
Answer: (c).Volcanic eruption
Question 37. Radioactive substances present in the polluted water stream can be removed by
  1.    biological oxygen treatment.
  2.    coagulation and filtration.
  3.    adsorption in ion exchange materials.
  4.    none of these.
 Discuss Question
Answer: Option C. -> adsorption in ion exchange materials.
Answer: (c).adsorption in ion exchange materials.
Question 38. Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).
  1.    highly
  2.    moderately
  3.    extremely
  4.    very extremely
 Discuss Question
Answer: Option B. -> moderately
Answer: (b).moderately
Question 39. Higher concentration of CO₂ in atmosphere
  1.    allows visible solar radiation (ultraviolet) of short wave-length to pass through.
  2.    reflects and absorbs the longer wavelength (infra-red) radiations.
  3.    prevents solar heat being radiated out completely, resulting in 'heat trap' i.e., global warming.
  4.    all (a), (b) and (c).
 Discuss Question
Answer: Option D. -> all (a), (b) and (c).
Answer: (d).all (a), (b) and (c).
Question 40. Most of the bacteria in sewage are
  1.    parasitic
  2.    saprophytic
  3.    anerobic
  4.    none of these
 Discuss Question
Answer: Option B. -> saprophytic
Answer: (b).saprophytic

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