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WorksheetsD56 MASTER THE DAY
Total questions: 101
Worksheet time: 2hrs 41mins
Name
Class
Date
1.
Which process removes fine suspended and colloidal particles from water after sedimentation?
a)
Screening
b)
Aeration
c)
Filtration
d)
Coagulation
2.
Which coagulant is most commonly used in water treatment?
a)
Ferric chloride
b)
Alum
c)
Sodium aluminate
d)
Copperas
3.
In slow sand filters, what is the effective size of sand particles?
a)
0.2–0.4 mm
b)
0.35–0.55 mm
c)
0.55–0.70 mm
d)
1.0–1.5 mm
4.
Which method is used for cleaning rapid sand filters?
a)
Scraping
b)
Boiling
c)
Backwashing
d)
Chemical treatment
5.
Which disinfectant method is most commonly used in public water supplies?
a)
Ozonation
b)
Boiling
c)
UV rays
d)
Chlorination
6.
The pH range suitable for Alum as a coagulant is:
a)
4.0 – 5.5
b)
6.5 – 8.5
c)
8.5 – 10
d)
5.0 – 6.0
7.
What is the cleaning method in a slow sand filter?
a)
Backwashing
b)
Scraping
c)
Lime addition
d)
Blowing air
8.
Which of the following is not removed by boiling water?
a)
Bacteria
b)
Temporary hardness (Ca)
c)
Permanent hardness
d)
Cholera organisms
9.
What is the rate of filtration for rapid sand filters?
a)
100–200 L/hr/m²
b)
300–500 L/hr/m²
c)
3000–6000 L/hr/m²
d)
6000–15000 L/hr/m²
10.
Which process is suitable for removing salt from seawater?
a)
Zeolite process
b)
Demineralization
c)
Reverse osmosis
d)
Boiling
11.
Which of the following filters is most efficient in removing bacteria?
a)
Slow sand filter
b)
Rapid sand filter
c)
Pressure filter
d)
Activated carbon filter
12.
Which water treatment process uses a gelatinous floc to trap particles?
a)
Filtration
b)
Flocculation
c)
Coagulation
d)
Sedimentation
13.
Which compound is used in electrokatyadin process for water disinfection?
a)
Ozone
b)
Silver
c)
Copper sulphate
d)
Iodine
14.
What is the common byproduct of boiling water for temporary hardness removal?
a)
Mg(OH)₂
b)
CaCO₃
c)
CaCl₂
d)
CaSO₄
15.
Which of the following water treatment methods has no residual effect?
a)
Ozone
b)
Chlorination
c)
UV rays
d)
Lime treatment
16.
Which process uses sodium-based resin to remove hardness?
a)
Zeolite process
b)
Lime soda process
c)
Boiling
d)
Flocculation
17.
How is slow sand filter cleaned?
a)
Backwash
b)
Chemical dosing
c)
Air scouring
d)
Scraping top sand layer
18.
Which filtration method uses pressurized water flow in a closed tank?
a)
Slow sand filter
b)
Pressure filter
c)
Rapid sand filter
d)
Gravity filter
19.
Which water treatment process removes dissolved gases and improves taste and odor?
a)
Sedimentation
b)
Coagulation
c)
Aeration
d)
Disinfection
20.
Which coagulant does NOT require natural alkalinity for its reaction?
a)
Alum
b)
Ferric sulphate
c)
Sodium aluminate
d)
Chlorinated copperas
21.
What is the function of a flocculator in water treatment?
a)
Remove dissolved solids
b)
Kill bacteria
c)
Aid particle agglomeration
d)
Filter water
22.
Which filter has the highest rate of filtration?
a)
Slow sand filter
b)
Rapid sand filter
c)
Pressure filter
d)
Dual media filter
23.
Which chemical is used to treat algae in water treatment plants?
a)
KMnO₄
b)
Copper sulphate
c)
Ozone
d)
Chlorine
24.
Which pH range results in formation of dichloramine during chlorination?
a)
pH > 9.5
b)
pH < 4.4
c)
pH = 6.5 – 5
d)
pH = 7 – 8
25.
What type of hardness is removed using boiling?
a)
Permanent hardness
b)
Temporary hardness (Ca only)
c)
Both
d)
None
26.
Which layer in a filter traps the finest particles?
a)
Top gravel
b)
Middle gravel
c)
Bottom sand
d)
Dirty skin (Schmutzdecke)
27.
Assertion (A): Ozone is a powerful disinfectant used in water treatment.
Reason (R): Ozone has residual disinfecting power like chlorine.
a)
Both A and R are true, and R is the correct explanation
b)
Both A and R are true, but R is not the correct explanation
c)
A is true, R is false
d)
A is false, R is true
28.
In slow sand filters, what causes the head loss to increase over time?
a)
Filter slope
b)
Coagulation
c)
Clogging of filter media
d)
Chemical precipitation
29.
Which method is used for fluoride removal from water?
a)
Boiling
b)
Softening
c)
Defluoridation
d)
Zeolite process
30.
Which water treatment method is best for industrial boilers?
a)
Slow sand filter
b)
Demineralization
c)
Boiling
d)
Aeration
31.
What is the common method to remove dissolved iron from groundwater?
a)
Chlorination
b)
Softening
c)
Iron removal plant
d)
Activated carbon
32.
Which of the following is not used for permanent hardness removal?
a)
Lime soda
b)
Zeolite
c)
Demineralization
d)
Boiling
33.
What is the cleaning interval for rapid sand filters?
a)
1–3 months
b)
1–3 days
c)
Weekly
d)
Daily
34.
What causes air binding in rapid sand filters?
a)
High turbidity
b)
Negative head
c)
High temperature
d)
Backwashing
35.
Which disinfection method is used in silver ion process?
a)
Ozonation
b)
UV
c)
Electrokatyadin
d)
KMnO₄
36.
Which of the following is an oxidising agent used in disinfection?
a)
Sodium chloride
b)
Copper sulphate
c)
Potassium permanganate
d)
Silver nitrate
37.
Which is a major disadvantage of alum as a coagulant?
a)
High cost
b)
No floc formation
c)
Sludge formation
d)
Unpleasant odor
38.
Which of the following is NOT an advantage of slow sand filter?
a)
High bacterial efficiency
b)
Good taste and odor removal
c)
Requires frequent backwashing
d)
Simple operation
39.
Which of the following increases pH above 9.4 for disinfection?
a)
Ozone
b)
Chlorine
c)
Excess lime
d)
Potassium permanganate
40.
In a pressure filter, flocculation occurs:
a)
Before sedimentation
b)
Inside the filter
c)
After filtration
d)
In sedimentation tank
41.
Which of the following is a post-treatment process?
a)
Coagulation
b)
Softening
c)
Disinfection
d)
Screening
42.
Chloramines are also known as:
a)
Residual chlorine
b)
Combined chlorine
c)
Free chlorine
d)
Fixed chlorine
43.
Which type of water contains more than 30,000 mg/l TDS?
a)
Brackish water
b)
Severely saline water
c)
Sweet water
d)
Sea water
44.
Statement 1: Filtration removes suspended solids and microbes.
Statement 2: Filtration is the first step in water treatment.
a)
Both statements are true
b)
Statement 1 is true, Statement 2 is false
c)
Statement 1 is false, Statement 2 is true
d)
Both statements are false
45.
What is the most effective method for desalination of seawater?
a)
Boiling
b)
Zeolite process
c)
Reverse osmosis
d)
Lime soda process
46.
What happens to pink color in KMnO₄ when organic matter is present?
a)
Darkens
b)
Turns yellow
c)
Disappears
d)
No change
47.
Which layer of filter is responsible for biological action?
a)
Base gravel
b)
Top coarse gravel
c)
Dirty skin layer
d)
Drain pipe
48.
Which of the following is a disadvantage of ozone treatment?
a)
High residual power
b)
Foul smell
c)
High cost
d)
Not effective
49.
Which method is not effective for removing magnesium carbonate?
a)
Boiling
b)
Lime addition
c)
Lime soda
d)
Zeolite process
50.
Which method of water treatment removes both suspended solids and pathogens effectively?
a)
Sedimentation
b)
Filtration
c)
Coagulation
d)
Screening
51.
Which type of filter is unsuitable for water with turbidity > 50 ppm?
a)
Rapid sand filter
b)
Slow sand filter
c)
Pressure filter
d)
Multi-media filter
52.
Which process is used to adjust fluoride levels in drinking water?
a)
Softening
b)
Fluoridation/Defluoridation
c)
Aeration
d)
Disinfection
53.
Which type of hardness is caused by sulphates and chlorides of calcium and magnesium?
a)
Temporary
b)
Permanent
c)
Carbonate
d)
Non-carbonate
54.
Which one of the following is used as a coagulant in water treatment?
a)
Copper sulphate
b)
Alum
c)
Sodium chloride
d)
Soda ash
55.
What is the optimum pH range for alum to function as coagulant?
a)
4.5–5.5
b)
5.5–6.5
c)
6.5–8.5
d)
8.5–9.5
56.
Which of the following is NOT removed in sedimentation with coagulation?
a)
Colloidal particles
b)
Bacteria
c)
Dissolved gases
d)
Fine suspended matter
57.
The dirty skin or 'Schmutzdecke' is associated with:
a)
Rapid sand filter
b)
Pressure filter
c)
Slow sand filter
d)
Activated carbon filter
58.
What is the common method for cleaning rapid sand filters?
a)
Scraping
b)
Backwashing
c)
Flushing
d)
Manual stirring
59.
Which of the following water treatment steps is essential before rapid sand filtration?
a)
Sedimentation only
b)
Coagulation and Sedimentation
c)
Aeration
d)
None
60.
Statement 1: KMnO₄ is used to disinfect rural wells.
Statement 2: Disinfection using KMnO₄ leaves a strong residual effect.
a)
Both statements are true
b)
Statement 1 is true, Statement 2 is false
c)
Statement 1 is false, Statement 2 is true
d)
Both statements are false
61.
Which of the following methods is used to remove taste and odor from water?
a)
Aeration
b)
Activated carbon
c)
Oxidation
d)
All of the above
62.
In electrodialysis, which type of membranes are used?
a)
Semi-permeable membranes
b)
Cation and Anion selective membranes
c)
Carbon filters
d)
Sponge filters
63.
What is the cleaning method used in pressure filters?
a)
Scraping
b)
Backwashing
c)
Air binding
d)
Manual stirring
64.
Which disinfectant is most suitable for temporary military camps?
a)
KMnO₄
b)
Chlorine
c)
Iodine tablets
d)
UV light
65.
Which method softens water by exchanging Na⁺ with Ca²⁺ and Mg²⁺?
a)
Zeolite process
b)
Lime soda process
c)
Boiling
d)
Ozonation
66.
Which method is suitable for brackish water up to 5000 mg/l salt content?
a)
Boiling
b)
Reverse osmosis
c)
Electrodialysis
d)
Ion exchange
67.
What is the initial head loss in a rapid sand filter?
a)
10–15 cm
b)
15–30 cm
c)
30 cm
d)
0.5 m
68.
Which of the following processes does NOT contribute to filtration mechanism?
a)
Mechanical straining
b)
Electrolytic action
c)
Flocculation
d)
Boiling
69.
Which of the following methods is used in boiler feed water treatment?
a)
Zeolite process
b)
Demineralization
c)
Boiling
d)
Defluoridation
70.
Which compound is added during lime soda process to remove non-carbonate hardness?
a)
Lime
b)
Soda ash
c)
Chlorine
d)
Ozone
71.
Which disinfectant is generated using an ozoniser?
a)
Chlorine
b)
Ozone
c)
Silver
d)
KMnO₄
72.
What is the typical gravel size range in rapid sand filter base?
a)
3–60 mm
b)
3–40 mm
c)
0.3–0.75 mm
d)
1–10 mm
73.
Which chemical process increases alkalinity and imparts bitter taste?
a)
Chlorination
b)
Ozonation
c)
Excess lime addition
d)
Electrolysis
74.
Which process is effective in removing calcium bicarbonate?
a)
Boiling
b)
Zeolite process
c)
Demineralization
d)
Reverse osmosis
75.
Which disinfectant leaves a pink colour in water?
a)
Chlorine
b)
KMnO₄
c)
Ozone
d)
Silver
76.
Assertion (A): Slow sand filters are more effective in removing bacteria than rapid sand filters.
Reason (R): Slow sand filters have higher filtration rate than rapid sand filters.
a)
Both A and R are true, and R is the correct explanation
b)
Both A and R are true, but R is not the correct explanation
c)
A is true, R is false
d)
A is false, R is true
77.
Which is the most efficient disinfectant in terms of residual power?
a)
Chlorine
b)
Ozone
c)
KMnO₄
d)
UV rays
78.
Which of the following is a disadvantage of pressure filters?
a)
High bacterial efficiency
b)
Less efficient than gravity filters
c)
Used in large towns
d)
Require low maintenance
79.
Which process is ineffective for colored water treatment?
a)
Chlorinated copperas
b)
Ferric sulphate
c)
Alum
d)
Copper sulphate
80.
Which process removes TDS but not bacteria?
a)
Ozonation
b)
Filtration
c)
Reverse osmosis
d)
Coagulation
81.
What is the typical slope in filter tank floors?
a)
1 in 50
b)
1 in 100
c)
1 in 150
d)
Flat
82.
Which of the following coagulants is commonly used in sewage treatment?
a)
Chlorinated copperas
b)
Alum
c)
Soda ash
d)
Copper sulphate
83.
Which filter is most suitable for small community water supplies in rural areas?
a)
Rapid sand filter
b)
Slow sand filter
c)
Pressure filter
d)
Dual media filter
84.
Which filtration method uses multiple layers of media to improve efficiency?
a)
Single media filter
b)
Double media filter
c)
Multi-media filter
d)
Pressure filter
85.
What is the role of gravel in a sand filter?
a)
Filter media
b)
Prevent clogging
c)
Support filter media and aid drainage
d)
Kill bacteria
86.
Which of the following processes is used to remove iron and manganese from groundwater?
a)
Ozonation
b)
Softening
c)
Iron removal process
d)
Filtration only
87.
What is the effective particle size of sand used in rapid sand filters?
a)
0.2–0.4 mm
b)
0.35–0.55 mm
c)
0.55–0.70 mm
d)
0.7–1.2 mm
88.
Which of the following is a mechanical method of disinfection?
a)
Boiling
b)
UV rays
c)
Filtration
d)
Electrokatyadin
89.
What is the role of aeration in water treatment?
a)
Increase turbidity
b)
Remove pathogens
c)
Remove dissolved gases
d)
Kill algae
90.
Which process involves the exchange of cations in water with H⁺ ions?
a)
Reverse osmosis
b)
Demineralization
c)
Zeolite process
d)
Ion suppression
91.
Which method is effective for temporary water supply in hospitals?
a)
Slow sand filters
b)
Boiling
c)
Pressure filters
d)
Dual media filters
92.
Which of the following is added during lime-soda process to maintain alkalinity?
a)
Sodium chloride
b)
Soda ash
c)
Copper sulphate
d)
Calcium bicarbonate
93.
Which of the following processes converts magnesium bicarbonate into Mg(OH)₂?
a)
Boiling
b)
Lime addition
c)
Filtration
d)
Ozonation
94.
Which membrane is used in reverse osmosis?
a)
Perforated
b)
Cation selective
c)
Semi-permeable
d)
Micro-porous
95.
Which process is also known as cation exchange process?
a)
Lime-soda process
b)
Demineralization
c)
Zeolite process
d)
Electrodialysis
96.
Which water is called 'sweet water' based on TDS?
a)
< 1000 mg/l
b)
1000–5000 mg/l
c)
5000–10000 mg/l
d)
> 30000 mg/l
97.
Which chemical is used in the silver ion (electrokatyadin) disinfection method?
a)
Silver nitrate
b)
Silver electrodes
c)
Sodium aluminate
d)
Ferric chloride
98.
Which type of chloramine has the least disinfecting property?
a)
Monochloramine
b)
Dichloramine
c)
Trichloramine
d)
Free chlorine
99.
Which parameter decides the need for coagulation in raw water?
a)
Alkalinity
b)
Colour
c)
Turbidity
d)
pH
100.
Which disinfectant is suitable for treating small water quantities where cost is not a concern?
a)
KMnO₄
b)
Ozone
c)
Iodine
d)
UV rays
101.
Which method removes both turbidity and bacteria most effectively in a single unit?
a)
Sedimentation
b)
Coagulation
c)
Pressure filter
d)
Slow sand filter
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