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MCQs

Total Questions : 918 | Page 91 of 92 pages
Question 901. Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid ilow control. It is caused due to
  1.    Both A & B
  2.    Reynold stresses
  3.    Shear forces
  4.    Neither A nor B
 Discuss Question
Answer: Option A. -> Both A & B
Question 902. TLV of mercury in potable (drinking) water is about __________ ppm.
  1.    1
  2.    5
  3.    0.1
  4.    0.001
 Discuss Question
Answer: Option D. -> 0.001
Question 903. TLV of lead for public sewer/waste water is about __________ ppm.
  1.    25
  2.    650
  3.    1
  4.    150
 Discuss Question
Answer: Option C. -> 1
Question 904. Radioactive substances present in the polluted water stream can be removed by
  1.    Biological oxygen treatment
  2.    Adsorption in ion exchange materials
  3.    Coagulation and filtration
  4.    None of these
 Discuss Question
Answer: Option B. -> Adsorption in ion exchange materials
Question 905. The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant?
  1.    Chlorine
  2.    Alkyl benzene sulphonate (ABS)
  3.    Alkalis
  4.    Benzene hexachloride
 Discuss Question
Answer: Option A. -> Chlorine
Question 906. Which of the following is not an air pollutant?
  1.    Pesticides
  2.    Metallic powders
  3.    Ozone
  4.    Carcinogens
 Discuss Question
Answer: Option C. -> Ozone
Question 907. Presence of excess flourine in water causes
  1.    Fluorosis
  2.    Dental cavity
  3.    Respiratory disease
  4.    Tooth decay
 Discuss Question
Answer: Option A. -> Fluorosis
Question 908. As compared to rapid sand filters, slow sand filters give(i) Slower filtration rate(ii) Higher filtration rate(iii) Lesser efficiency in removal of bacteria(iv) Higher efficiency in removal of bacteriaThe correct answer is
  1.    (i) and (ii)
  2.    (ii) and (iii)
  3.    (i) and (iv)
  4.    (ii) and (iv)
 Discuss Question
Answer: Option C. -> (i) and (iv)
Question 909. 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.    88
  2.    84
  3.    80
  4.    92
 Discuss Question
Answer: Option B. -> 84
Question 910. Higher concentration of nitrogen dioxide in atmospheric air causes
  1.    Cancer
  2.    Asphyxiation
  3.    Bronchitis
  4.    Corrosion
 Discuss Question
Answer: Option C. -> Bronchitis

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