621. If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is________________?
A. 2 hours
B. 3 hours
C. 4 hours
D. 5 hours
✅ The correct answer is option C.
Civil Engineering
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622. Pick up the in-correct statement from the following?
A. Manholes are provided in sewer pipes at suitable intervals
B. Catch basins are generally provided in sewers for carrying drainage discharge
C. Inlets are generally provided in all sewers
D. None of these
✅ The correct answer is option C.
623. In an immersed body, center of pressure is ____________________?
A. at the center of gravity
B. above the center of gravity
C. below be center of gravity
D. could be above or below e.g. depending on density of body and liquid
✅ The correct answer is option C.
624. Pick up the incorrect statement from the following for allowing workers to enter sewers_______________?
A. The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes
B. Proper tests for the presence of poisonous gases must be carried out
C. The men entering the manhole should be advised to smoke in the sewer
D. Warning signals should be erected
✅ The correct answer is option C.
625. Maximum permissible velocity 1.5 m/sec, is adopted in drains_______________________?
A. With beds of rocks and gravels
B. Lined with stones
C. Both A. and B.
D. Neither A. nor B.
✅ The correct answer is option C.
626. The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is____________________?
A. 100 cm
B. 110 cm
C. 120 cm
D. 150 cm
✅ The correct answer is option C.
627. Mercury does not wet glass. This is due to property of liquid known as_________________?
A. adhesion
B. cohesion
C. surface tension
D. viscosity
✅ The correct answer is option C.
628. Sewer pipes need be checked for_________________?
A. Minimum flow
B. Maximum flow
C. Both A. and B.
D. None of these
✅ The correct answer is option C.
629. The screens are fixed___________________?
A. Perpendicular to the direction of flow
B. Parallel to the direction of flow
C. At an angle 30° to 60° to the direction of flow
D. None of these
✅ The correct answer is option C.
630. The ratio of the net income before taxes to net sales is called __________________?
A. Current ratio
B. Inventory turnover
C. Profit margin ratio
D. Price-earnings ratio
✅ The correct answer is option C.