The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about______________?

Related Mcqs:

The hourly variation factor is usually taken as______________?

A. 1.5 B. 1.8 C. 2.0 D. 2.7...

The length of rectangular sedimentation tank should not be more than_______________?

A. B B. 2B C. 4B D. 8B where B is the width of the tank...

The pathogens can be killed by_______________?

A. nitrification B. chlorination C. oxidation D. none of the above...

The main disadvantage of cement concrete sewers is________________?

A. less strength B. difficulty in construction C. difficulty in transportation due to heavy weight D. less life...

Which of the following causes a decrease in per capita consumption ?

A. use of metering system B. good quality of water C. better standard of living of the people D. hotter climate...