641. The most effective arrangement for diverting excess storm water into a natural drainage, is____________________?
A. Leaping weir
B. Overflow weir
C. Siphon spill way
D. None of these
✅ The correct answer is option C.
Civil Engineering
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642. With self cleansing velocity in sewers___________________?
A. Silting occurs at bottom
B. Scouring occurs at bottom
C. Both silting and scouring occur at bottom
D. Neither silting nor scouring occurs at bottom
✅ The correct answer is option D.
643. What is a measure of the average speed with which accounts receivable are collected ?
A. Current ratio
B. Quick ratio
C. Acid test ratio
D. Receivable turnover
✅ The correct answer is option D.
644. Rain drops are spherical because of____________________?
A. viscosity
B. air resistance
C. surface tension forces
D. atmospheric pressure
✅ The correct answer is option C.
645. Buoyant force is___________________?
A. resultant force acting on a floating body
B. equal to the volume of liquid displaced
C. force necessary to keep a body in equilibrium
D. the resultant force on a body due to the fluid surrounding it
✅ The correct answer is option D.
646. A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is__________________?
A. 1
B. 5
C. 7
D. 6
✅ The correct answer is option D.
647. For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is__________________?
A. 16 m
B. 20 m
C. 24 m
D. 30 m
✅ The correct answer is option C.
648. Water content of sewage is about___________________?
A. 90 %
B. 95 %
C. 99 %
D. 9.9 %
✅ The correct answer is option D.
649. In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is_______________?
A. D
B. D /2
C. D/3
D. D/4
✅ The correct answer is option D.
650. The total energy of each particle at various places in the case of perfect incompres sible fluid flowing in continuous sream________________?
D. keeps on increasing
B. keeps on decreasing
C. remains constant
D. may increase/decrease
✅ The correct answer is option C.