If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is____________________?

A. h
B. wh
C. w/h
D. h/w
E. h/wh

A. center of gravity
B. center of pressure
C. metacentre
D. center of buoyancy
E. in between e.g. and center of pressure

A. The horizontal component of the hydro-static force on any surface is equal to the normal force on the vertical projection of the surface
B. The horizontal component acts through the center of pressure for the vertical projection
C. The vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area
D. he vertical component passes through the center of pressure of the volume
E. Center of pressure acts at a greater depth than center of gravity