Environmental Engineering Mock Test 3

10%

Question 1 of 10

1. Iron and Manganese are generally present in water supplies as ____________

Suspension

Either suspension or solution

Colloidal particles

Solution

Question 1 of 10

Question 2 of 10

2. The temperature of disinfection is inversely proportional to the killing of organisms.

False

True

Question 2 of 10

Question 3 of 10

3. Which of the following statement is wrong regarding hard water?

It increases the taste of food

It causes the formation of scales on the boilers

It causes difficulties in the manufacturing process

It causes more consumption of soap in laundry work

Question 3 of 10

Question 4 of 10

4. The number of organisms destroyed is equal to the number of organisms remaining at time t = __________

Question 4 of 10

Question 5 of 10

5. Ozone is a _______ allotrope of oxygen.

Diatomic

Monoatomic

Triatomic

Polyatomic

Question 5 of 10

Question 6 of 10

6. The temporary hardness in water is due to the presence of __________

Carbonates and bicarbonates

Sulfates, Chlorides

Sulfates and carbonates

Sulfates, Chlorides, nitrates

Question 6 of 10

Question 7 of 10

7. The water is free from oxidizable materials. What is the dosage of ozone required?

0.2-0.3ppm

0.4-0.5ppm

0.1-0.2ppm

0.01ppm

Question 7 of 10

Question 8 of 10

8. The reddish tinge in the water is due to the presence of ____________

Manganese

Iron

Copper

Zinc

Question 8 of 10

Question 9 of 10

9. The dimensional formula of rate constant used in Chicks law is ____________

1/t³

1/t

t²

1/t²

Question 9 of 10

Question 10 of 10

10. In which form of chlorination, chlorine applies to raw water supply as it enters the distribution system?

Double chlorination

Pre chlorination

Plain chlorination

Super chlorination

Question 10 of 10