What is the standard amount of fluorine in water? a. 5 mg/l

1 What is the standard amount of fluorine in water?
a. 0.7 - 1.5 mg/l
b. 3 mg/l
c. 5 mg/l
d. 7 mg/l
e. 0.1 -0.5 mg/l
2 Permissible amount of hardness in drinking water:
a. 2 mmol/l
b. 7 mmol/l
c. 0.1 mmol/l
d. 9 mmol/l
e. 10 mmol/l
3 Sources of underground water supply include:
a. lake and groundwater
b. pressurized and non-pressurized artesian waters
c. reservoirs and seepage waters
d. Catchments and rivers
4 What are the groups of water supply sources?
a. Stationary and shift
b. underground and stationary
c. Open and closed
d Stationary and shift
5 Methods of sanitary inspection of water supply sources
a. Sanitary topography
b. Sanitary helminthological
c. Sanitary entomological
d. Sanitary technological
e. Sanitary mechanic
6 Determine the power and pressure per second of the water receiving facility. The amount of water needed per person to supply water to an area with a population of 35,000 people is 220 l/day. the amount of water required for rotting? Number of floors 4 (do not consider internal fire)