Civil Engineering – Water Supply Engineering – Mock test – 1 Welcome to your Water supply Engineering Mock test - 1 Take an exciting test in the topic of Water Supply Engineering You have only 20 mins to complete the test (25 Questions) Wish you all the best!!! Name Email 1. Corrosion of well pipes may not be reduced by A. reducing the draw down and the pumping rate B. reducing the flow velocity C. using thicker pipes D. using screens having larger area of openings E. none of these.2. Economic height of a dam is the height corresponding to which A. cost of the dam per unit of storage is minimum B. amount of silting is less C. cost of dam per unit storage is maximum D. free board provided is least E. none of these.3. 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.4. In pressure supply mains, water hammer pressure is reduced by providing A. sluice valves B. air valves C. pressure relief valves D. none of the these.5. The maximum depth of sedimentation tanks is limited to A. 2 m B. 3 m C. 4 m D. 5 m E. 6 m.6. In distribution pipes, drain valves are provided at A. lower point B. higher point C. junction points D. any where.7. Pick up the incorrect statement from the following regarding fire hydrants A. Fire hydrants are fitted in water mains at 100 m to 150 m apart at fire B. The minimum water pressure hydrants, is kept 1.5 kg/cm2 C. The water at pressure 1 to 1.5 kg/cm2 is made available for 4 to 5 hours for constant use D. None of these.8. Water supply system includes A. digging a well for water B. construction of dams C. construction of canals D. entire arrangement from source to distribution.9. By boiling water, hardness can be removed if it is due to A. calcium sulphate B. magnesium sulphate C. calcium nitrate D. calcium bicarbonate E. none of these.10. The maximum permissible nitrites in public water supplies, is A. Nil B. 0.5 P.P.M. C. 1.0. P.P.M. D. 1.5 P.P.M. E. 200 P.P.M.11. Distribution mains of any water supply, is normally designed for its average daily requirement A. 100% B. 150% C. 200% D. 225%.12. 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 E. 35 times.13. A high velocity of wash water is required for A. rapid gravity filter with strainers B. rapid gravity filter without strainers C. slow sand filter with strainers D. slow sand filter without strainers14. The transitional middle portion of a logistic curve follows A. a geometric growth B. a logarithmic growth C. a first over curve D. a constant rate.15. Most commonly used pump for lifting water in water supply mains, is A. axialflow pump B. reciprocating pump C. rotary type pump D. centrifugal pumps E. none of these.16. B.O.D. of treated water should be A. 10 ppm B. 25 ppm C. 20 ppm D. 30 ppm E. Nil.17. Pick up the incorrect statement from the following. The underground sources of water, is from A. wells B. springs C. infiltration wells D. storage reservoirs E. none of these.18. The population growth curve is A. S-shaped curve B. parabolic curve C. circular curve D. straight line E. none of these.19. Sunlight A. helps growth of bacterias B. impedes growth of algae C. increases dissolved oxygen content D. reduces turbidity.20. The least thickness of class B cast iron (spun) pipe, is A. 7.2 mm B. 7.9 mm C. 8.6 mm D. 10 mm.21. Disinfection of drinking water, is done to remove A. odour B. bacterias C. turbidity D. colour.22. Turbidity of raw water is a measure of A. suspended solids B. acidity of water C. B.O.D. D. none of these.23. Aeration of water is done to remove A. odour B. colour C. bacterias D. hardness E. turbidity.24. The specific retention is least in case of A. Clay B. Sand C. Silt D. Coarse gravel.25. Time of concentration A. is the time taken, for precipitation B. duration of rainfall. C. time taken for all the ran off to reach the drain D. time taken for the storm water to travel from the most remote point to the drain.