Setting out the alignments of sewers may start from__________________?
Setting out the alignments of sewers may start from__________________?
A. City
B. Out-fall
C. Tail end
D. Any point
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3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is______________________?
3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is______________________?A. 100 mg/l
B. 200 mg/l
C. 300 mg/l
D. 400 mg/lDuring purification process of sewage the gas given off, is________________?
During purification process of sewage the gas given off, is________________?A. Carbon dioxide
B. Hydrogen
C. Ammonia
D. All the aboveCavitation is caused by___________________?
Cavitation is caused by___________________?A. high velocity
B. high pressure
C. weak material
D. low pressure
E. low viscositySlate is formed by metamorphic action on______________?
Slate is formed by metamorphic action on______________?A. shale
B. lime stone
C. sand stone
D. graniteCenter of buoyancy is the___________________?
Center of buoyancy is the___________________?A. centroid of the displaced volume of fluid
B. center of pressure of displaced volume
C. e.g. of floating ‘body
D. does not exist
E. none of the aboveWhen a body floating in a liquid, is displaced slightly, it oscillates about ___________________?
When a body floating in a liquid, is displaced slightly, it oscillates about ___________________?A. e.g. of body
B. center of pressure
C. center of buoyancy
D. metacentre
E. liquid surface