Environmental Engineering Mock Test 3

10%

Question 1 of 10

1. The number of organisms in disinfection process can be expressed by ____________

C ⁿ / t_p = Constant

C ^q / N_p = Constant

C ^q * N_p = Constant

Cⁿ *t _p = Constant

Question 1 of 10

Question 2 of 10

2. The total hardness of water is 100ppm as CaCO₃ equivalent. What is the type of water?

Moderately hard

Hard

Very hard

Soft

Question 2 of 10

Question 3 of 10

3. When turbidity in water increases, the efficiency of chlorine?

Remains constant

Increases

Decreases

Slightly increases

Question 3 of 10

Question 4 of 10

4. What is the pH at which recarbonation should be done?

9.5

8.2

4.5

Question 4 of 10

Question 5 of 10

5. Which of the following is not used for removing the permanent hardness?

Lime soda process

Zeolite process

Demineralization

Adding lime

Question 5 of 10

Question 6 of 10

6. The chlorine, which serves as a disinfectant is ___________

Chlorine demand

Free Residual chlorine

Free chlorine

Residual demand

Question 6 of 10

Question 7 of 10

7. Which of the following is termed as free available chlorine?

Hypochlorous acid, Hypochlorite ions, Molecular chlorine

Hypochlorite ions

Hypochlorous acid

Molecular chlorine

Question 7 of 10

Question 8 of 10

8. Consider the following statements regarding diatomite filters.
i. They are not used for water having high turbidity.
ii. They are not suitable for municipal water supplies.
iii. They are not used for temporary and shifting camps.
Which of the above statement is/are false?

iii only

ii only

i, ii, iii

i only

Question 8 of 10

Question 9 of 10

9. Natural zeolite is mainly processed from ____________

Grey sand

White sand

Red sand

Green sand

Question 9 of 10

Question 10 of 10

10. The minimum reaction time allowed in the recarbonation basin is ____________

15minutes

10minutes

5minutes

20minutes

Question 10 of 10