| Post Name | Training Instructor (Plumber) |
|---|---|
| Department | Scheduled Castes Development |
| Question Paper Code | 077/2026/OL |
| Category Code | 014/2025 |
| Date of Test | 29 April 2026 |
| Exam Type | Online Examination |
| Total Questions | 100 |
1
Which fire extinguisher is suitable for electrical fires?
Answer
Question Cancelled
2
What type of fire does a Class B extinguisher target?
Answer
B. Flammable liquids
3
A yellow triangle with a black border usually indicates:
Answer
C. Hazard or warning
4
Which PPE is required for welding operations?
Answer
D. Flame-resistant gloves and helmet
5
Which class of fire involves flammable metals?
Answer
D. Class D
6
In a neutral flame, what is the temperature in the inner core?
Answer
A. 3200oC
7
In soft soldering the melting point of filler metal is
Answer
A. below 420oC
8
What is the percentage of carbon present in low alloy steel?
Answer
B. 0.25%
9
Single tank torches are typically suitable for
Answer
C. Both (1) and (2)
10
Which of the following flame is the hottest?
Answer
C. Oxidizing flame
11
Oxy-acetylene can cut
Answer
D. all of the above
12
In oxidizing flame, the color of inner cone is
Answer
B. purplish tinge
13
Acetylene gas is kept in cylinders by mixing with
Answer
B. acetone
14
The composition of soft solder is
Answer
D. lead-37%, tin-63%
15
The purpose of using borax in brazing is to ______________.
Answer
A. Dissolve oxides when heating the work
16
The piece of a brick cut along the centre of width in such a way that its length is equal to that of full brick, is called:
Answer
D. Queen closer
17
The initial setting time for ordinary Portland cement as per IS specification should not less than _______________,
Answer
B. 30 minutes
18
How much percentage of alumina should contain in a good brick earth?
Answer
B. 20-30
19
The slump test is used for determining
Answer
A. Work ability
20
Which water connection is provided before the water enters the water meter in the house?
Answer
C. Stop cock
21
The recommended spacing of manholes on sewers, having diameter upto 0.3 m, is:
Answer
B. 45 m
22
A concrete composed of cement, course aggregate and water only is called
Answer
Question Cancelled
23
The detention period of septic tank is
Answer
B. 24 to 48 hours
24
For RCC construction the maximum size of course aggregate is limited to
Answer
B. 20 mm
25
Most commonly used retarder in cement manufacture
Answer
C. Gypsum
26
Which of the following is not considered as a rusticated joint in stone masonry?
Answer
A. Cramped joint
27
The urinals which are mostly used in ladies laboratories are
Answer
D. Squatting plate urinals
28
The binding materials used in surkhi mortar is
Answer
C. Lime
29
Masonry consists of blocks of stones carefully dressed with narrow joints
Answer
A. Ashlar masonry
30
The ingredients of gauged mortar other than water are
Answer
D. Cement, Lime and Sand
31
Which joint is specifically designed to allow fo the easy dismantling of a pipeline for repair or cleaning?
Answer
C. Flange joint
32
In a Spigot and Socket joint, what is the primary function of the Spigot end?
Answer
B. To be inserted into the enlarged end of the next pipe
33
Which fitting is used to connect four pipes at a single junction in a plumbing circuit?
Answer
C. Cross
34
Which specific pipe fitting is used to join two pipes of different diameters while keeping the centrelines of the pipes aligned?
Answer
B. Concentric Reducer
35
A 'Union' fitting is considered essential in a residential GI pipeline circuit primarily because:
Answer
B. It allows for the disconnection of a segment without dismantling the entire line
36
Which type of valve is specifically designed to throttle or regulate the flow of water, rather than just acting as a simple on/off switch?
Answer
B. Globe Valve
37
The 'Lead Caulking' method is a traditional joining technique primarily used for which type of pipe?
Answer
C. CI Socket and Spigot joints
38
To close the end of a pipe that has internal threads (female threads), which of the following should be used?
Answer
B. Plug
39
What is the main advantage of DI (Ductile Iron) pipes over standard CI (Cast Iron) pipes?
Answer
C. Better tensile strength and impact resistance
40
A 'Bib Cock' is a specific type of valve usually installed at:
Answer
C. The end of a pipe to allow water to be drawn into a basin or bucket
41
The largest usable source of fresh water for human consumption is:
Answer
C. Ground water
42
Assertion (A) : Lakes generally have less turbidity than rivers Reason (R) : Flow velocity in lakes is lower than in rivers, allowing suspended particles to settle.
Answer
A. Both Assertion and Reason are true and Reason is the correct explanation
43
Identify the correct statements: I. Hardness is caused by multivalent metal ions II. Soft water form lather easily with soap III. Permanent hardness can be removed by boiling IV. Zeolite process exchanges Ca2+ and Mg2+ with Na+
Answer
D. I, II, IV
44
Temporary hardness of water can be removed by
Answer
C. Boiling
45
Which filtration method works mainly through biological action?
Answer
C. Slow sand filter
46
Water at 40oF is equal to
Answer
C. - 40oC
47
Assertion (A) : A sealed glass container filled with water may crack if frozen Reason (R) : Water density becomes maximum at 4oC
Answer
B. Both (A) and (R) are true but (R) does not explain (A)
48
The expansion of water on freezing is approximately:
Answer
C. 9%
49
Assertion (A) : Water comes out with greater force when a hole is made near the bottom of a water tank than when a hole is made near the top. Reason (R) : Hydrostatic pressure in a liquid at rest increases with the depth below the free surface according to P = gh.
Answer
A. Both (A) and (R) are true and (R) is the correct explanation of (A)
50
In long pipe lines, water hammer effect is reduced by:
Answer
B. Using air vessels
51
Which pipe material is not suitable for hot water supply?
Answer
C. PVC
52
What is the function of 'Red leaf' in plumbing?
Answer
B. To act as a sealant for threaded pipe joints
53
The process of joining copper pipes using spelter is known as ______________.
Answer
D. Brazing
54
The standard design period for a common water treatment plant is
Answer
B. 15 Years
55
In which system of water supply, water is supplied only during fixed hours of the day?
Answer
A. Intermittent system
56
Which one of the following pumps is not a positive displacement pump?
Answer
B. Centrifugal pump
57
The process of filling liquid to be pumped in the suction pipe and casting of the centrifugal pump is known as
Answer
B. Priming
58
What is the minimum recommended distance between a septic tank and water well to prevent contamination?
Answer
D. 50 feet
59
Which heavy metal can contaminate wells through the corrosion of old plumbing fixtures?
Answer
B. Lead
60
Shock Chlorination is a process used to
Answer
D. Disinfect a well after flooding and repair
61
Consider the following statements about the functioning of a cesspool: i. The lower portion of the cesspool allows settling and partial decomposition of solids. ii. The structure works exactly like a fully sealed septic tank. iii. The upper portion helps in absorption of liquid effluent into surrounding soil. Which of the above statements are correct?
Answer
B. i and iii only
62
Consider the following statements regarding a cesspool : i. A cesspool disposes sewage mainly by allowing liquid to soak into surrounding soil. ii. It is suitable only when the soil has good permeability. iii. It is recommended when the groundwater table is very high. Which of the above statements are correct?
Answer
A. i and ii only
63
The main reason for providing two chambers in a septic tank is :
Answer
B. To separate fresh sewage from partially digested sludge
64
Consider the following statements regarding sludge in septic tanks : i. It should never be removed once the tank is constructed. ii. It is partially decomposed under anaerobic conditions. iii. Sludge accumulates at the bottom of the tank. Which of the above statements are correct?
Answer
C. ii and iii only
65
Consider the following statements regarding inlet and outlet in septic tanks : i. The inlet pipe is usually kept slightly higher than the outlet pipe. ii. Baffle walls are provided to prevent direct flow of sewage from inlet to outlet. iii. The outlet pipe helps in removing sludge from the tank. Which of the above statements are correct?
Answer
B. i and ii only
66
Consider the following statements regarding scum formation in septic tanks : i. Scum is formed mainly by grease, fats and floating materials. ii. Scum layer helps in reducing oxygen entry into sewage. iii. Scum formation completely stops anaerobic digestion. Which of the above statements are correct?
Answer
A. i and ii only
67
The benching provided in a manhole mainly helps to :
Answer
B. Direct sewage into the channel and prevent stagnation
68
Consider the following statements regarding drop manholes : i. A drop manhole is provided when the incoming sewer is much higher than the outgoing sewer. ii. It helps reduce excessive velocity in the sewer line. iii. It prevents erosion and turbulence inside the manhole. Which of the above statements are correct?
Answer
C. i, ii and iii
69
Consider the following statements regarding inspection chambers in house drainage : i. They provide access for inspection and cleaning. ii. They are usually provided at changes in direction of pipes. iii. They completely replace the need for manholes in all sewer systems. Which of the above statements are correct?
Answer
B. i and ii only
70
Consider the following statements regarding soak pits : i. A soak pit is used for the disposal of effluent from septic tanks. ii. It allows wastewater to infiltrate slowly into the surrounding soil. iii. It provides complete biological treatment of sewage. Which of the above statements are correct?
Answer
C. ii and iii only
71
An automatic device which allows water to flow only in one direction is called
Answer
B. Check valve
72
A small pipe piece which have external threads at both the ends is called as :
Answer
D. Nipple
73
Which type of seal is used to avoid leakage from flanged joint?
Answer
C. Gasket
74
Infrared (IR) cameras detect water leaks in pipes by identifying _____________.
Answer
A. Temperature difference
75
An air lock in a gravity pipe system is most likely to occur at
Answer
B. The highest point
76
Which valve component is responsible for transmitting motion from the hand wheel to the valve disc during opening and closing operations?
Answer
A. Valve stem
77
Which device is installed to protect the penstock from water hammer?
Answer
D. Surge tank
78
An ultrasonic leak detector identifies leaks by :
Answer
A. Detecting high-frequency sound waves
79
The accuracy of a water meter is usually expressed as a percentage of :
Answer
C. The actual volume passed
80
The pressure for a hydrostatic test is usually ____________ times the working pressure.
Answer
B. 1.5
81
What is the minimum required water seal depth for traps in plumbing systems?
Answer
A. 2.5 cm
82
A "one-pipe partially ventilated system" is a mix, often using a relief vent to ventilate which specific fixtures?
Answer
D. Water Closets (WCs) and urinals
83
In a one-pipe plumbing system, what is combined into a single pipe?
Answer
B. Soil (toilet) and wastewater (sullage)
84
Which of the following test is used to detect the leakage of rain water pipe in the testing of house sewers?
Answer
A. Smoke test
85
Which test is best for checking the leakage of a split A/C condenser?
Answer
D. Electronic leak detector
86
Which of the following installation is used to spray water over a surface to provide protection of fire?
Answer
A. Drencher
87
Water supply for fire fighting can be done by which type of hydrant system?
Answer
A. Wet hydrant system
88
Which trap is commonly used for an Indian-type water closet?
Answer
C. P-Trap
89
In fire fighting, what is the process of cutting holes in the roof to allow hot air and smoke to escape?
Answer
D. Vertical ventilation
90
Anti-siphonage pipe is fitted
Answer
B. With a water closet trap
91
What is the main purpose of a plumbing trap?
Answer
B. Prevent sewer gases entering the building
92
The building drain ventilating pipeline should not be less than
Answer
A. 75 mm
93
Temperature is a measure of
Answer
B. Degree of hotness or coldness
94
Sewer ventilation is necessary because sewer gases are
Answer
C. Toxic and explosive
95
Specific heat of Aluminium
Answer
A. 0.22
96
1 Calorie = __________ Joule.
Answer
C. 4.18
97
It is mandatory to fix non return valve in case inlet pressure of water heater is more
Answer
D. 18 M head
98
In ____________ hot gases in several tubes is used to heat the surrounding water.
Answer
B. Fire tube boilers
99
_____________ rely on heat driven convection to circulate water or heating fluid in the system.
Answer
C. Passive system
100
The main component that absorbs solar heat is
Answer
A. Collector
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