Variant 7

Variant 7

Test 1. What should be the maximum allowable Coli-titre in drinking water after disinfection of water?

B. Not more then 300 B.Not less then 500 C. Not more then 100

D. Not less then 300 E. More than 3

Test 2. Methods of organoleptic properties of water improvement :

A. Cleaning of water B.Desactivation C.Double chlorination

E. Superchlorination E. Simple chlorination of water

Test 3. For determination quality of drinking water after purification and disinfection of water must be used following group of indexes :

A.Organoleptics, biological, toxicological B.Organoleptics, chemical, bacteriological

C. Sanitation and toxicological D.Organoleptics, physical, chemical

E.Biological and sanitation

Test 4. What is a purification of water?

А. Clearing of water from microbes В. Clearing of water from suspended substances

С. Clearing of water from vira D. Disinfection of water with chlorine

E. Disinfection of water with boiling

Test 5. Name decentralized system of water-supply?

A. Water pipe B. Wells C. Distillation of water D. Boiling of water E.Does not exist

Test6. What is a purpose of chlorination with a preаmmonization?

А. For unpleasant smells prevention В. For increase time of bacteriological action

С. For field conditions D. For unknown water E.For superchlorination

Test 7. Chemical methods of disinfection of water:

A. Ozonization B. Double chlorination C. Boiling

D. Ultraviolet irradiation E. Ordinary chlorination

Test 8. When double chlorination of drinking water is used?

A. Very dirty water B. Subsoil water C. Underground inter–layer water

D. Artesian water E.Water contain of phenols

Test9. After desinfection of drinking water with chlorine-contenting substances organoleptic properties of water:

A. are improved; B. are worsened; C. don’t be changed

D.become clear E. become dark

Test 10. After desinfection of drinking water with ozone organoleptic properties of water:

A. are improved; B. are worsened; C. don’t be changed

D.become yellow E. become dark