A. given in the direction of natural slope of ground
B. given in the direction opposite to natural slope of ground
C. zero
D. steeper than 1 in 20
✅ The correct answer is option A.
Environmental Engineering MCQs
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
✅ The correct answer is option A.
The most common cause of acidity in water is_______________?
A. carbon dioxide
B. oxygen
C. hydrogen
D. nitrogen
✅ The correct answer is option A.
Which of the following unit works in anaerobic conditions ?
A. sludge digestion tank
B. sedimentation tank
C. activated sludge treatment
D. trickling filters
✅ The correct answer is option A.
The main disadvantage of oxidation pond is that________________?
A. large area is required for construction
B. maintenance and operation cost are high
C. BOD removal is very low
D. none of the above
✅ The correct answer is option A.
For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be________________?
A. separate system
B. combined system
C. partially combined system
D. partially separate system
✅ The correct answer is option A.
Which of the following values of pH represents a stronger acid?
A. 2
B. 5
C. 7
D. 10
✅ The correct answer is option A.
The method of analysis of distribution system in which the domestic supply is neglected and fire demand is considered is________________?
A. circle method
B. equivalent pipe method
C. electrical analysis method
D. Hardy cross method
✅ The correct answer is option A.