MCQ Questions Civil Engineering Environmental Engineering
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MCQ Questions Civil Engineering Environmental Engineering - Set - 4
Question 1:
For a given discharge, the efficiency of sedimentation tank can be increased by
a) increasing the depth of tank
b) decreasing the depth of tank
c) increasing the surface area of tank
d) decreasing the surface area of tank
Correct Answer – (C)
Question 2 :
The settling velocity of a particle in a sedimentation tank depends on
a) depth of tank
b) surface area of tank
c) both depth and surface area of tank
d) none of the above
Correct Answer – (B)
Question 3 :
The overflow rate for plain sedimentation tanks is about
a) 500 to 750 litres/hour/ m2
b) 1000 to 1250 litres/hour/ m2
c) 1250 to 1500 litres/hour/m2
d) 1500 to 2000 litres/hour/m2
Correct Answer – (A)
Question 4 :
The velocity of flow of water in a sedimentation tank is about
a) 5 to 10 cm/sec.
b) 15 to 30 cm/sec.
c) 15 to 30 cm/minute
d) 15 to 30 cm/hour
Correct Answer – (C)
Question 5 :
The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about
a) 0.01 to 0.05 ppm
b) 0.05 to 0.5 ppm
c) 0.5 to 1.0 ppm
d) 1.0 to 5.0 ppm
Correct Answer – (B)
MCQ Questions Civil Engineering Environmental Engineering
Question 6:
The settling velocity of a particle in a sedimentation tank increases if
a) particle size is decreased
b) the surface area of tank is increased
c) the depth of tank is decreased
d) none of the above
Correct Answer – (D)
Question 7:
Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about
a) 10 to 25
b) 50
c) 75
d) 100
Correct Answer – (C)
Question 8:
The length of rectangular sedimentation tank should not be more than
a) B
b) 2B
c) 4B
d) 8B
where B is the width of the tank
Correct Answer – (C)
Question 9:
The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of
a) 1 mg/litre
b) 10 mg/litre
c) 100 mg/litre
d) 1000 mg/litre
Correct Answer – (B)
Question 10:
If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to
a) total alkalinity
b) total hardness
c) total hardness – total alkalinity
d) non carbonate hardness
Correct Answer – (A)
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