Water Quality – MCQ
1. Temporary hardness in water is caused by
a) Bi-nitrates of Ca ++ and Mg ++
b) Sulphate of Ca++ and Mg ++
c) Carbonates of Ca++ and Mg++
d) Nitrates of Ca++ and Mg++
View Answer
c) Carbonates of Ca++ and Mg++
2. As per BIS, the maximum permissible limit of Arsenic in potable water is
a) 0.01 mg/l
b) 0.5 mg/l
c) 0.10 mg/l
d) 0.05 mg/l
View Answer
d) 0.01mg/l
3. Maximum permissible turbidity for drinking water based on the silica scale is
a) 50 ppm
b) 10 ppm
c) 5 ppm
d) 20 ppm
View Answer
c) 5 ppm
4. Which of the following can be used for water disinfection?
a) Ozone
b) Chlorine
c) Hydrogen peroxide
d) None of these
View Answer
b) Chlorine
5. Which of the following methods are used for water purification?
a) Screening
b) Fluoridation
c) Disinfection
d) All of the above
e) Only (a) and (c)
View Answer
d) All of the above
6. Screening is the process which helps to remove
a) Large particles
b) Very Small particles
c) Colloidal particle
d) None
View Answer
a) Large particles
7. Which of the following factors affect the process of sedimentation
a) Velocity of flow
b) Viscosity of water
c) Specific gravity of the particles
d) All of these
View Answer
d) All of these
8. The value of uniformity co-efficient for rapid gravity filters is
a) 3 to 3.5
b) 1.8 to 2.5
c) 1.3 to 1.7
d) 0.3 to 1.2
View Answer
c) 1.3 to 1.7
9. The value of uniformity co-efficient for slow gravity filters is
a) 3 to 3.8
b) 1.8 to 2.5
c) 1.3 to 1.7
d) 1 to 1.2
View Answer
b) 1.8 to 2.5
10. The uniformity co-efficient is express as
a) D60/D10
b) D10/D60
c) D10/D50
d) None
View Answer
a) D60/D10
11. The filters works under pressure is known as
View Answer
Pressure filter.
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