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WorksheetsD62 MASTER THE DAY
Total questions: 111
Worksheet time: 2hrs 51mins
Name
Class
Date
1.
Which instrument used in sewer testing forms bubbles at leaky joints?
a)
Lead acetate paper
b)
Boning rod
c)
Soap solution
d)
Blower
2.
Which gas is tested in sewers using a lighted lantern to confirm safe entry?
a)
Methane
b)
Carbon dioxide
c)
Oxygen
d)
Hydrogen sulfide
3.
Which method is used to set out the centerline of sewer trenches?
a)
Offset line method
b)
Diagonal method
c)
Compass method
d)
Radiation method
4.
What is the role of boning rods during sewer trenching?
a)
Detect gas
b)
Check level
c)
Lift pipes
d)
Backfill trenches
5.
Which test uses a lamp and mirror to check pipe alignment?
a)
Water test
b)
Smoke test
c)
Mirror test
d)
Ball test
6.
During air testing, what pressure drop indicates leakage?
a)
5 mm
b)
10 mm
c)
25 mm
d)
40 mm
7.
Which of the following gases is identified by flame formation in the upper layer?
a)
CH₄
b)
CO₂
c)
O₂
d)
H₂S
8.
What does lead acetate paper test for?
a)
CO₂
b)
CH₄
c)
H₂S
d)
O₂
9.
Which part of the ventilating system allows gases to escape from the sewer?
a)
Trap
b)
Ventilating shaft
c)
Cowl
d)
Inlet
10.
Which of the following is a floating hollow object used in sewer cleaning?
a)
Rake
b)
Ball
c)
Pill
d)
Rod
11.
Which test is useful in detecting both cracks and open joints?
a)
Mirror test
b)
Air test
c)
Smoke test
d)
Ball test
12.
Assertion: Flushing is used for small sewers.
Reason: Small sewers are accessible by manual labour.
a)
Both A and R are true and R explains A
b)
Both A and R are true but R doesn't explain A
c)
A is true, R is false
d)
A is false, R is true
13.
In which sewers is cane rodding used?
a)
Large sewers
b)
Small sewers
c)
Medium sewers
d)
All types
14.
What is the major internal stress due to sewage flow?
a)
Torsional stress
b)
Shear stress
c)
Tensile stress
d)
Compressive stress
15.
What is the function of ventilating columns in a sewer system?
a)
Detect blockages
b)
Prevent flooding
c)
Release sewer gases
d)
Increase velocity
16.
During trench excavation, which tool is used to ensure proper depth and slope?
a)
Mirror
b)
Ball
c)
Boning rod
d)
Smoke blower
17.
Assertion: Pipes act like a beam when supported at ends.
Reason: This introduces flexural stresses in sewer pipes.
a)
Both A and R are true and R explains A
b)
Both A and R are true but R doesn't explain A
c)
A is true, R is false
d)
A is false, R is true
18.
Which sewer component supports the pipe alignment and gradient checking?
a)
Ball
b)
Sight rail
c)
Vent pipe
d)
Cowl
19.
Which component is placed at bends and junctions to resist pipe movement?
a)
Support rod
b)
Thrust block
c)
Sight rail
d)
Boning rod
20.
Which cleaning method is NOT suitable for large diameter sewers?
a)
Manual labour
b)
Flushing
c)
Rodding
d)
Scrapping
21.
Which sewer testing method is preferred when water is not easily available?
a)
Smoke test
b)
Ball test
c)
Air test
d)
Mirror test
22.
Which cleaning method is used when sewer size does not permit human entry?
a)
Manual labour
b)
Flushing
c)
Ventilation
d)
Scraping
23.
What does a full circle of light in mirror test indicate?
a)
Obstruction present
b)
Pipe is leaking
c)
Sewer is straight
d)
Gas present
24.
What is the standard spacing of pegs on straight reaches in sewer alignment?
a)
10 m
b)
15 m
c)
30 m
d)
50 m
25.
Which of the following detects obstruction in sewer pipes?
a)
Mirror
b)
Soap solution
c)
Ball
d)
Cane rod
26.
Assertion: Sewer ventilation prevents gas accumulation.
Reason: Ventilation columns allow gases to escape.
a)
Both A and R are true and R explains A
b)
Both A and R are true but R doesn't explain A
c)
A is true, R is false
d)
A is false, R is true
27.
Which of the following is NOT a purpose of ventilating manhole covers?
a)
Prevent airlocks
b)
Release gases
c)
Increase water pressure
d)
Maintain air circulation
28.
What is the role of thrust blocks in sewers?
a)
Join pipes
b)
Act as vents
c)
Anchor pipes at bends
d)
Block water
29.
What is the main reason for using floating balls in medium sewer cleaning?
a)
Gas detection
b)
Joint sealing
c)
Obstruction clearing
d)
Pipe alignment
30.
What is the expected cover above sewer pipe top level in trenches?
a)
0.5 m
b)
0.7 m
c)
0.9–1.0 m
d)
1.5 m
31.
Which of the following is NOT a force acting on sewers?
a)
Flexural stress
b)
Shear stress
c)
Compressive stress
d)
Temperature stress
32.
Which of the following is true about sewers supported at two ends?
a)
They do not bend
b)
They act as beams
c)
They are air-tight
d)
They must be vented
33.
Assertion: Smoke test helps detect cracks in pipes.
Reason: Smoke forms bubbles at cracks.
a)
Both A and R are true and R explains A
b)
Both A and R are true but R doesn't explain A
c)
A is true, R is false
d)
A is false, R is true
34.
What happens if methane is present in the sewer?
a)
Flame forms on lowering lamp
b)
Flame extinguishes
c)
Paper turns black
d)
No effect
35.
Which stress is introduced by load of soil and traffic over sewers?
a)
Tensile stress
b)
Shear stress
c)
Compressive stress
d)
Thermal stress
36.
Which gas is detected if flame extinguishes within 5 minutes?
a)
CO₂
b)
CH₄
c)
O₂
d)
H₂S
37.
Which test is performed between two manholes with water pressure?
a)
Mirror test
b)
Water test
c)
Smoke test
d)
Ball test
38.
Which sewer gas is responsible for blackening lead acetate paper?
a)
O₂
b)
CO₂
c)
CH₄
d)
H₂S
39.
In which location are ventilating columns commonly installed?
a)
Every 50 m
b)
Near water mains
c)
At pipe joints
d)
At branch sewer upper ends
40.
Which component helps maintain the alignment during sewer pipe laying?
a)
Smoke blower
b)
Cowl
c)
Sight rail
d)
Soap solution
41.
Which method is most effective to detect pipe cracks visually?
a)
Water test
b)
Smoke test
c)
Ball test
d)
Air test
42.
Which of the following is required before entering a manhole?
a)
Closing manhole tightly
b)
Spraying water
c)
Checking for gases
d)
Pouring concrete
43.
Which gas detection technique involves blackening of paper?
a)
Oxygen detection
b)
Methane test
c)
H₂S detection
d)
CO₂ test
44.
Which gas is confirmed if a lamp burns brilliantly in the sewer?
a)
Oxygen
b)
CO₂
c)
CH₄
d)
H₂S
45.
Why are sewer pipes laid with socket ends facing upstream?
a)
Aesthetic appearance
b)
Ease of jointing
c)
To resist backflow pressure
d)
To improve velocity
46.
Which tool is used for obstruction testing in a pipe?
a)
Sight rail
b)
Ball
c)
Boning rod
d)
Cowl
47.
What indicates presence of CO₂ gas in sewer testing?
a)
Paper turns black
b)
Flame forms
c)
Flame extinguishes
d)
Bubble formation
48.
Assertion: Air test can detect leaky joints.
Reason: Air escapes through cracks forming sound.
a)
Both A and R are true and R explains A
b)
Both A and R are true but R doesn't explain A
c)
A is true, R is false
d)
A is false, R is true
49.
What is the reason for using concrete bed below sewer pipes?
a)
To increase depth
b)
To reduce cost
c)
To provide firm support
d)
To prevent heat loss
50.
Which method uses mechanical force to insert balls or pills into sewer?
a)
Air testing
b)
Smoke testing
c)
Manual scraping
d)
Medium sewer cleaning
51.
Which method uses pegs and stakes for alignment marking?
a)
Compass survey
b)
Offset line method
c)
Smoke testing
d)
Boning rod testing
52.
Which of the following increases oxygen transfer in sewer self-purification?
a)
CO₂
b)
Turbulence
c)
CH₄
d)
Backfilling
53.
What should be the diameter of the ball used for ball testing?
a)
Same as pipe bore
b)
15 mm less than bore
c)
13 mm less than bore
d)
25 mm more than bore
54.
Why is air testing not used for small pipes?
a)
Too expensive
b)
Too small for pressure maintenance
c)
Not needed
d)
Soap reacts with pipe
55.
Which of the following forces can cause bending in pipes?
a)
Thermal stress
b)
Flexural stress
c)
Shear stress
d)
Tensile stress
56.
Assertion: CO₂ is detected using miner's lamp.
Reason: Lamp flame increases in CO₂ presence.
a)
Both A and R are true and R explains A
b)
Both A and R are true but R doesn't explain A
c)
A is true, R is false
d)
A is false, R is true
57.
Which process is done just before laying sewer pipes?
a)
Joint testing
b)
Ball passing
c)
Cleaning of pipes
d)
Pressure testing
58.
What causes tensile stress inside sewer pipes?
a)
Backfill load
b)
Traffic load
c)
Flowing sewage
d)
External pressure
59.
Which component of sewer ventilation is placed at top to guide gas escape?
a)
Trap
b)
Cover slab
c)
Cowl
d)
Grating
60.
Which test uses a lamp placed at one end of the sewer pipe?
a)
Air test
b)
Smoke test
c)
Mirror test
d)
Ball test
61.
What is the use of a 'traveller' in sewer construction?
a)
Transportation
b)
Alignment setting
c)
Gas detection
d)
Water diversion
62.
Why is earth tamped during backfilling?
a)
For aesthetic purpose
b)
To increase depth
c)
To avoid future settlement
d)
To trap water
63.
Which test in sewers is conducted using blower equipment?
a)
Water test
b)
Air test
c)
Ball test
d)
Smoke test
64.
Which is NOT a component used in offset line method?
a)
Boning rod
b)
Stakes
c)
Pegs
d)
Smoke blower
65.
What is the typical pressure maintained during air test?
a)
25 mm
b)
50 mm
c)
75 mm
d)
100 mm
66.
Assertion: Flushing is used for large diameter sewers.
Reason: Flushing can reach long distances effectively.
a)
Both A and R are true and R explains A
b)
Both A and R are true but R doesn't explain A
c)
A is true, R is false
d)
A is false, R is true
67.
Which material is NOT suitable for constructing sewers?
a)
Cast iron
b)
Plastic
c)
Cardboard
d)
RCC
68.
Which gas is lighter than air and accumulates at sewer top?
a)
CH₄
b)
CO₂
c)
O₂
d)
H₂S
69.
What is the role of ventilation shafts during sewage flow?
a)
Increase velocity
b)
Supply oxygen
c)
Allow gas escape
d)
Control gradient
70.
Which component prevents lateral movement of pipes at junctions?
a)
Vent shaft
b)
Boning rod
c)
Thrust block
d)
Grating
71.
Why is mirror test not effective in blocked pipes?
a)
Light gets diffused
b)
Pipe is too clean
c)
Water reflects light
d)
Sound echoes interfere
72.
Which of the following is a test for sewer straightness?
a)
Air test
b)
Ball test
c)
Mirror test
d)
Water test
73.
Which of the following sewers uses scrapping and rodding tools?
a)
Large-sized
b)
House drains
c)
Medium-sized
d)
Storm drains
74.
Which method uses lamp and mirror to detect straightness?
a)
Air test
b)
Smoke test
c)
Mirror test
d)
Flame test
75.
Why is compacting necessary during sewer backfilling?
a)
To add weight
b)
To increase slope
c)
To prevent future settlement
d)
To delay road laying
76.
Which component allows sewer gas to escape vertically?
a)
Thrust block
b)
Vent column
c)
Boning rod
d)
Ball trap
77.
Assertion: Large sewers are cleaned by manual labor.
Reason: They allow entry of workers inside them.
a)
Both A and R are true and R explains A
b)
Both A and R are true but R doesn't explain A
c)
A is true, R is false
d)
A is false, R is true
78.
Which of the following is used to detect H₂S gas in sewer?
a)
Gas chromatograph
b)
Lead acetate paper
c)
Lime water
d)
Soap solution
79.
Which of the following is a non-point source of water pollution?
a)
Sewage discharge
b)
Industrial effluent
c)
Agricultural runoff
d)
Effluent from treatment plant
80.
Which gas is primarily responsible for acid rain formation?
a)
CO₂
b)
SO₂
c)
CH₄
d)
H₂
81.
What is the main cause of waterborne diseases?
a)
Hardness in water
b)
Pathogenic microorganisms
c)
Suspended solids
d)
Chlorine
82.
What is the acceptable limit of fluoride in drinking water as per BIS standards?
a)
0.5 mg/L
b)
1.0 mg/L
c)
1.5 mg/L
d)
2.0 mg/L
83.
Assertion: Use of chlorination helps disinfect drinking water.
Reason: Chlorine destroys pathogenic organisms present in water.
a)
Both A and R are true and R explains A
b)
Both A and R are true but R does not explain A
c)
A is true, R is false
d)
A is false, R is true
84.
Which parameter is measured in NTU in water testing?
a)
Hardness
b)
Turbidity
c)
TDS
d)
BOD
85.
The self-purification capacity of rivers depends mainly on:
a)
Length of river
b)
Temperature
c)
Flow velocity and turbulence
d)
Number of tributaries
86.
Biochemical Oxygen Demand (BOD) indicates:
a)
Presence of dissolved oxygen
b)
Toxic metals in water
c)
Organic pollution level
d)
Alkalinity of water
87.
What does high coliform count in water indicate?
a)
High hardness
b)
Presence of pathogens
c)
Chemical contamination
d)
Low turbidity
88.
Which of the following is NOT a method of water disinfection?
a)
Chlorination
b)
Boiling
c)
Sedimentation
d)
UV radiation
89.
What is the effect of nitrate pollution in infants?
a)
Diabetes
b)
Methemoglobinemia
c)
Kidney stones
d)
Typhoid
90.
Which physical property of water supports aquatic life?
a)
Hardness
b)
DO (Dissolved Oxygen)
c)
Turbidity
d)
pH
91.
Assertion: High BOD in a river is dangerous to aquatic life.
Reason: High BOD indicates greater oxygen demand which reduces DO.
a)
Both A and R are true and R explains A
b)
Both A and R are true but R does not explain A
c)
A is true, R is false
d)
A is false, R is true
92.
Which indicator organism is used to detect fecal pollution in water?
a)
E. coli
b)
Salmonella
c)
Hepatitis virus
d)
Giardia
93.
Which of the following is a primary pollutant?
a)
Ozone
b)
Carbon monoxide
c)
PAN
d)
Smog
94.
Which technique is used to measure pH of water sample?
a)
Spectrophotometer
b)
Turbidimeter
c)
pH meter
d)
Electrometer
95.
Statement: Chlorination kills all bacteria.
Reason: Some bacteria form spores and resist chlorine.
a)
Both Statement and Reason are true and related
b)
Both Statement and Reason are true but not related
c)
Statement is false, Reason is true
d)
Statement is true, Reason is false
96.
What is the permissible limit of total dissolved solids (TDS) in drinking water?
a)
100 mg/L
b)
500 mg/L
c)
1000 mg/L
d)
2000 mg/L
97.
Which of the following best defines potable water?
a)
Water that is free from taste
b)
Water that is safe and suitable for drinking
c)
Water that is completely mineral-free
d)
Water used for irrigation only
98.
What is the main source of arsenic contamination in groundwater?
a)
Industrial discharge
b)
Agricultural runoff
c)
Geological formations
d)
Atmospheric pollution
99.
The unit used to express hardness of water is:
a)
mg/L as CaCO₃
b)
ppm of Fe
c)
pH units
d)
NTU
100.
Which process is used for removal of suspended solids?
a)
Sedimentation
b)
Chlorination
c)
Boiling
d)
Ion exchange
101.
Which is a characteristic of eutrophication?
a)
Increase in DO
b)
Decrease in nutrient levels
c)
Excessive growth of algae
d)
Purification of water
102.
What is the purpose of alum in water treatment?
a)
Kills bacteria
b)
Precipitates fluoride
c)
Helps coagulate impurities
d)
Removes iron
103.
Which component in water causes dental mottling when in excess?
a)
Iron
b)
Fluoride
c)
Chloride
d)
Nitrate
104.
What is the main cause of thermal pollution in water bodies?
a)
Oil spills
b)
Discharge from nuclear plants
c)
Industrial hot water discharge
d)
Municipal sewage
105.
Which of the following is used in slow sand filters for biological action?
a)
Anthracite layer
b)
Schmutzdecke
c)
Activated alumina
d)
Bleaching powder
106.
Which parameter is not considered in assessing water quality?
a)
Turbidity
b)
BOD
c)
TDS
d)
Viscosity
107.
What is the role of break pressure tanks in water distribution?
a)
To chlorinate water
b)
To prevent water hammer
c)
To reduce excessive pressure in gravity systems
d)
To store hot water
108.
Assertion: Boiling makes water safe for drinking.
Reason: It kills most pathogens present in the water.
a)
Both A and R are true and R explains A
b)
Both A and R are true but R does not explain A
c)
A is true, R is false
d)
A is false, R is true
109.
What is the pH range of safe drinking water as per BIS?
a)
5.5 – 8.5
b)
6.5 – 8.5
c)
6.0 – 9.0
d)
5.0 – 10.0
110.
Which method is commonly used for iron removal in groundwater?
a)
Sedimentation
b)
Boiling
c)
Aeration and filtration
d)
Distillation
111.
Which of the following is a chemical parameter of water?
a)
Turbidity
b)
Color
c)
pH
d)
Temperature
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