500 Best Environmental Engineering- MCQ
Q53). The colour of water is expressed in numbers of a
a).Silica scale
b).Platinum cobalt scale
c).pO value
d).none of the above
Correct Answer:
Platinum cobalt scale
Explanation:
Q54). The odour of water can be determined by
a).Thermometer
b).Osmoscope
c).Jackson’s turbidimeter
d).None of these
Correct Answer:
Osmoscope
Explanation:
Q55). The commercial osmoscope is graduated with pO values from
a).0 to 5
b).5 to 10
c). 10 to 15
d).15 to 20
Correct Answer:
0 to 5
Explanation:
Q56). When the pO value of water is 5, then it has
a).No perceptible odour
b).Distinct odour
c).Faint odour
d).Extremely strong odour
Correct Answer:
Extremely strong odour
Explanation:
Q57). The maximum permissible temperature for domestic water supply is
a).5 to 10°C
b).10 to 15°C
c).15 to 20°C
d).20 to 25°C
Correct Answer:
10 to 15°C
Explanation:
Q58). The maximum permissible colour for domestic water supplies, on platinum cobalt scale is
a).5 to 10 ppm
b).10 to 20 ppm
c).20 to 30 ppm
d).30 to 40 ppm
Correct Answer:
10 to 20 ppm
Explanation:
Q59). Odours and tastes may result due to the presence of
a).Micro-organisms either dead or alive
b).Dissolved gases such as oxygen, carbon dioxide, methane etc
c).Mineral substances such as sodium chloride, iron compounds etc
d).All of the above
Correct Answer:
All of the above
Explanation:
Q60). The maximum permissible turbidity for domestic water supplies, on silica scale is
a).5 to 10 ppm
b).10 to 20 ppm
c).20 to 30 ppm
d).30 to 40 ppm
Correct Answer:
5 to 10 ppm
Explanation: