2811. The specific retention is least in case of_______________?
A. Clay
B. Sand
C. Silt
D. Coarse gravel
✅ The correct answer is option D.
Civil Engineering
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2812. In “full face” method of constructing tunnels, the first operation relates to______________?
A. removal of bottom portion
B. excavation of one drift in the centre
C. removal of top portion
D. excavation being done along the periphery
✅ The correct answer is option D.
2813. According to IS : 1172-1963, a minimum of 135 litres of water capita per day, is required for________________?
A. Boarding schools
B. Nurses home and medical quarters
C. hostels
D. all the above
✅ The correct answer is option D.
2814. It is customary to design a sewer for D.W.F. on the basis of________________?
A. Average demand
B. Twice the average demand
C. Thrice the average demand
D. Four times the average demand
✅ The correct answer is option C.
2815. The yield of a rapid gravity filter as compared to that of slow sand filter, is__________________?
A. 10 times
B. 15 times
C. 20 times
D. 30 times
✅ The correct answer is option D.
2816. For determining the velocity of flow of underground water, the most commonly used non-empirical formula is________________?
A. Darcy’s formula
B. Slichter’s formula
C. Hazen’s formula
D. Lacy’s formula
✅ The correct answer is option A.
2817. Surge tanks are used_______________?
A. for storage water
B. to increase the velocity in a pipeline
C. as overflow valves
D. to guard against water hammer
✅ The correct answer is option D.
2818. Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be________________?
A. nil
B. 5
C. 10
D. 15
✅ The correct answer is option A.
2819. In Belgium method of tunneling _________________?
A. construction of side walls is completed before invert and roof arch are built
B. construction of roof arch is completed before side walls and invert are built
C. construction of invert is completed before side walls and roof arch are built
D. construction of invert and side walls is completed before roof arch is built
✅ The correct answer is option B.
2820. Aeration of water is done to remove______________?
A. odour
B. colour
C. bacterias
D. hardness
✅ The correct answer is option A.