Water Treatment in Swimming Pool – MCQ

1. Recommended value of P^H in case of swimming pool water is

a) 5.6 to 6.5
b) 6.7 to 7.1
c) 7.4 to 7.6
d) 7.8 to 8.5

2. Acceptable value of free chlorine present in swimming pool water is

a) 0.1 to 0.85 mg/l
b) 1 to 2 mg/l
c) 2.3 to 4 mg/l
d) 4 to 5 mg/l

3. Which of the following component are added into the swimming pool water to remove bacteria and other germs from there.

a) Chlorine
b) Nitrogen
c) Potassium
d) None

4. Form in which chlorine is used for disinfections

a) As chlorine gas
b) As sodium hypochlorite
c) As calcium hypochlorite
d) All of these

5. The presence of excess TDS may make the swimming pool water

a) Dull
b) Unpleasant for bathing
c) Salty taste
d) All of these

6. Surface pollution in a swimming pool is caused by

a) Hair
b) Urine
c) Sand from the filter
d) Perspiration

7. Dissolve pollution may contain impurities as

a) Perspiration
b) Floating debris
c) Dust
d) Stone particles

8. Which of the following statement is wrong

In case of a swimming pool

a) The water should be transparent
b) Quantity of TDS should be high as much as possible
c) It should be chemically balanced
d) It should be safe for bath

9. In swimming pool, suction sweepers or vaccum cleaners are used to clean

a) Fluff
b) Solid wastes
c) Precipitated chemical
d) Sand
e) All of these

10. Biological pollution in a swimming pool is caused by

a) Dust
b) Hair
c) Dirt
d) Bacteria

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Water Treatment – MCQ

1. The rate of filtration of a slow sand filter is

a) 200 to 400 lit/m²/hr
b) 100 to 200 lit/m²/hr
c) 200 to 300 lit/m²/hr
d) 100 to 300 lit/m²/hr

2. A city supply of 15 MLD is to be disinfected with chlorine doses of 0.5 ppm. The bleaching powder contains 25 % of chlorine. The requirement of bleaching powder per day is

a) 300 kg
b) 75 kg
c) 30 kg
d) 7.5 kg

3. The expression for settling velocity for a sedimentation tank is given by

a) Q/BH
b) Q/BL
c) Q/LH
d) None of these.

4. What is the maximum permissible velocity in horizontal flow type sedimentation tank?

a) 1.2 m/sec
b) 0.9 m/ sec
c) 0.6 m/sec
d) 0.3 m/sec

5. What is the normal detection period for a plain sedimentation water tank?

a) 2 to 4 hours
b) 4 to 8 hours
c) 6 to 12 hours
d 8 to 16 hours

6. What is the effective size of sand particles in the case of a slow sand filter?

a) 0.7 mm to 1.3 mm
b) 0. 53 mm to 0.7 mm
c) 0. 4 mm to 0.53 mm
d) 0.2 mm to 0.4 mm

7. Which of the following factors affects the settlement of particles in the sedimentation tank?

a) Viscosity of water
b) Velocity of flow
c) Specific gravity of solid
d) Size and shape of solid
e) All of these

8. Settling velocity is proportional to the square of the diameter of the particle( according to Stoke’s law) when

a) Diameter of particles is between 0.1 and 10 mm
b) Diameter of particles is less than 0.1 mm
c) Diameter of particles is more than 1.0 mm
d) For all diameter

9. The maximum permissible concentration of cadmium in potable water as per who guide lines

a) 0.01 mg/l
b) 0.009 mg/l
c) 0.006 mg/l
d) 0.003 mg/l

10. Which of the following condition indicates the 100 % removal of particles from the bottom of a sedimentation tank?

a) Settling velocity < Liquide rising velocity
b) Settling velocity ≤ Liquide rising velocity
c) Settling velocity ≥ Liquide rising velocity
d) None of these

11. If the liquid rising velocity is greater than the settling velocity, then one would expect

a) 100 % removal of particles
b) 50 % removal of particles
c) 0 % removal of particles
d) None

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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⁺⁺

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

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

4. Which of the following can be used for water disinfection?

a) Ozone
b) Chlorine
c) Hydrogen peroxide
d) None of these

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)

6. Screening is the process which helps to remove

a) Large particles
b) Very Small particles
c) Colloidal particle
d) None

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

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

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

10. The uniformity co-efficient is express as

a) D₆₀/D₁₀
b) D₁₀/D₆₀
c) D₁₀/D₅₀
d) None

11. The filters works under pressure is known as

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Sources of Water – MCQ

1. Which of the following is not a subsurface source of water?

a) Storage reservoirs.
b) Springs.
c) Infiltration galleries.
d) Tube wells.

2. Which of the following is a surface source of water?

a) Wells.
b) Infiltration wells.
c) Streams.
d) None of these.

3. Which water has less chance of being contaminated by bacteria?

a) River.
b) Lake.
c) Sea.
d) Infiltration wells.

4. Which is the following factor considered for the selection of a particular source of water

a) Quantity of water available.
b) Elevation of the source.
c) Distance of the source of supply.
d) All of these.

5. The economic height of a dam is that height of the dam

a) The construction cost is low.
b) The storage capacity is sufficient.
c) The cost of the dam per unit of storage is minimum.
d) None.

6. Discharge per unit draw in case of an aquifer is known as

a) Specific yield.
b) Specific capacity.
c) Field capacity.
d) None of these.

7. The order number ‘m’ is computed by the equation

a) [latex]m = N . \frac{p}{100}[/latex]
b) [latex]m = N . \frac{p}{1000}[/latex]
c) [latex]m = N . \frac{2p}{100}[/latex]
d) [latex]m = 2N . \frac{p}{100}[/latex]

Where, p = dependability percentage, and N = Years.

8. Index of wetness is the ratio of

a) Actual rainfall in a given year at a given place to the total run-off of that place.
b) Rainfall intensity in a given year at a given place to the total run-off of that place.
c) Actual rainfall in a given year at a given place to the normal rainfall of that place.
d) None of these.

9. The precipitation occurs due to the pressure difference is –

a) Convective precipitation.
b) Cyclonic Precipitation.
c) Orographic precipitation.

10. Which of the following is not the form of precipitation

a) Rain
b) Snow
c) Hail
d) None of the above.

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