Variant 6

Variant 6

Test 1. What kind of water source is used for drinking purpose more often ? Give only one correct answer.

A. Undergraund water B. Atmospheric water

C. Surface water D. Distilled sea water E. Water between impevious strata

Test 2. What kind of water-supply sources is the most dirty? Give only one correct answer.

A. Undergraund water-supply B. Atmospheric water-supply

C. Surface water-supply D. Distilled sea water-supply

Test 3. Name decentralized system of water-supply?

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

Test 4. Physical methods of water’s disinfection:

A. Ozonization B. Double chlorination C. Boiling

D. Ultraviolet irradiation E. Ordinary chlorination

Test 5. When chlorination with preammonification of drinking water is used ?

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

D. Artesian water E.Water with phenols substances

Test 6. Methods of organoleptic properties of water’s improvement:

A. Purification of water B. Decontamination C. Neutralisation

D. Decrease of iron ions E .Disinfection of water

Test 7. Normal concentration of residual Chlorine in water (rng/l) after simple chlorination .

A. 0.1 – 0.2 B. 0.2 – 0.3 C. 0.3 – 0.5 D. 0.4 – 0.7 E. 0.6 – 0.8

Test 8. Directindexes of epidemic hazard of water:

A. Organoleptic parameters B. Chemical parameters C. Bacteriological parameters

D. Nitrogen’s content E. Oxygen’s content

Test 9. What parameters of water are improved after filtration of water?

A. Organoleptic parameters B. Chemical parameters C. Bacteriological parameters

D. Contents of the Nitrogen E. Contents of the Oxygen in water

Test 10. What is the chlorine necessity of water?

A. general rigidity of water + residual chlorine

B. eliminated rigidity of water + residual chlorine

C. eliminated rigidity of water + not eliminated rigidity of water

D. absorbing chlorine + residual chlorine

E. absorbing chlorine + general rigidity of water