300+ TOP Plumbing MCQs and Answers – Industrial Training

Plumbing Multiple Choice Questions Industrial Training

1. Rubber ring joints can be provided in the pipe line to …..

A. water free seal
B. water tight seal
C. water peel seal
D. none of the above

Answer: B

2. What is the use of hand taps …..

A. internal threads
B. external threads
C. internal gauge
D. internal drilling

Answer: A

3. In an acetylene cylinder the acetylene is dissolved in …..

A. carbon dioxide
B. water
C. acetone
D. mercury

Answer: C

4. Which grade G I pipe is used for water supply…..

A. yellow
B. blue
C. red
D. brown

Answer: B

5. The angle of metric thread is …..

A. 60 digree
B. 55 digree
C. 90 digree
D. 47 digree

Answer: A

6. What are the diameter of A C pipes available in …..

A. 4 cm to 100 cm
B. 5 cm to 100 cm
C. 2 cm to 100 cm
D. 6 cm to 100 cm

Answer: C

7. Name the tool used to check internal pipe threads …..

A. pipe taps
B. ring gauge
C. pipe plug threads
D. pipe bush

Answer: C

8. When pressure test can be started in solvent welder PVC pipe line

A. after 24 hours
B. after 12 hours
C. after 5 hours
D. after 36 hours

Answer: A

9. Where are collar joints used …..

A. smaller diameter C I pipe
B. small diameter A C pipe
C. small diameter S W pipe
D. small diameter P V C pipe

Answer: B

10. Which is the place preferred to fix scour valve …..

A. lowest point in pipe line
B. higher point in pipe line
C. straight line in pipe line
D. none of the above

Answer: A

11. Hardness that cannot be removed by boiling the water is called

A. difficult hardness
B. stiff hardness
C. permanent hardness
D. tough hardness

Answer: C

12. Galvanized iron is coated with …..

A. Copper
B. Lead
C. Zinc
D. Tin

Answer: C

13. What you should be sure you have in plenty before considering buying a solar water heater

A. abundant sunshine
B. very hot water
C. intermittent rain
D. all of the above

Answer: A

14. There are two primary chemicals used to purify water namely …..

A. iodine and chlorine
B. sodium and chlorine
C. chlorine and fluorine
D. fluorine and iodine

Answer: A

15. Which material is used for joining C.I. Pipes?

A. Lead and cement
B. Lead and lead wool
C. Zinc and lead wool
D. Copper and hemp yarn

Answer: B

16. What is used at the junction of house sewer and municipal sewer?

A. nahni trap
B. P. trap
C. Intercepting trap
D. S. trap

Answer: C

17. What is used to overcome siphonic action

A. anti siphonage pipe
B. vent pipe
C. coupler
D. vent cowl

Answer: A

18. What happens if cast iron pipes are coated with cool tar

A. loose strength
B. prevent corrosion
C. dos not sag
D. dos not fig

Answer: B

19. Which component in gully trap is used to prevent gases from entering waste line

A. air seal
B. C.I. cover
C. water seal
D. C.I. grating

Answer: C

20. Which accessories is used to change the direction flow in the pipe …..

A. water meter
B. pipe
C. cocks
D. fittings

Answer: D

21. In the context of water purification RO; stands for …..A. reverse osmosis

B. relative osmosis
C. reduced osmosis
D. refreshed osmosis

Answer: A

22. The use of asbestos cement is banned in some countries because …..

A. it cannot be repaired easily
B. it leads to health problems
C. it is highly corrosive
D. it is too costly

Answer: B

23. Metals possess physical and mechanical properties. Which one of the following is a physical property of metals?

A. Tenacity
B. Malleability
C. Fusibility
D. Ductility

Answer: C

24. Which one of the following is the resistance of a metal to elastic deformation …..

A. stiffness
B. toughness
C. strength
D. ductility

Answer: A

25. Displacement pumps are of two types …..

A. reciprocating and ram
B. reciprocating and rotary
C. reciprocating and centrifugal
D. reciprocating and jet

Answer: B

26. A portion of the plumbing system that receives discharges of soil and waste stacks within the building and conveys the same to the house sewer is …..

A. main drain
B. soil drain
C. waste drain
D. house drain

Answer: D

27. A plumbing fixture used for washing the middle private part of the body especially the Genitals is …..

A. bidet
B. ball faucet
C. mini shower
D. water house

Answer: A

28. What is boiling point of water in Fahrenheit (F) scale …..

A. 112°f
B. 212°f
C. 312°f
D. 100°f

Answer: B

29. Which test is applied in underground drains for soundness…..

A. hydraulic test
B. pneumatic test
C. water test
D. sound test

Answer: C

30. What are the two sub systems in your home plumbing …..

A. incoming fresh water and outgoing waste water
B. low pressure water and high pressure
C. hot and cold water
D. none of the above

Answer: A

31. How to prevent algae growth in O.H. tank?

A. copper sulphate
B. aluminium sulphate
C. lead powder
D. bleaching powder

Answer: A

32. What is check the alignment and condition of inside the pipe …..

A. smoke test
B. mirror test
C. air test
D. hydraulic test

Answer: B

33. How many days curing is required for S.W. pipe joints …..

A. 7 days
B. 2 days
C. 5 days
D. 3 days

Answer: A

34. What is the size of flush pipe for low level flushing cistern

A. 32 mm
B. 40 mm
C. 25 mm
D. 50 mm

Answer: B

35. What causes the siphonic action in soil pipe …..

A. leaked air
B. foul air
C. sucked air
D. air diffuser

Answer: C

36. What instrument is used while conducting air test in pipe line …..

A. manometer
B. vinometer
C. thermometer
D. tint meter

Answer: A

37. State the size of ball used in ball test …..

A. 13 mm less than inside diameter of pipe
B. 12 mm less than inside diameter of pipe
C. 11 mm less than inside diameter of pipe
D. 10 mm less than inside diameter of pipe

Answer: A

38. What is the use of NAHNI trap …..

A. to collect waste water from bath room
B. to collect rain water
C. to collect soil pipe from sewage
D. to collect raw water from river

Answer: A

39. Why mono block pumps are more popular …..

A. large in size
B. small in size
C. no valves
D. no priming

Answer: B

40. How many pipes are there in a one pipe system …..

A. one
B. three
C. four
D. two

Answer: D

41. The space between the teeth of a handsaw is called …..A. Gullet

B. Kert
C. Flank
D. Pitch

Answer: A

42. Which bond is commonly used for …..

A. Stretcher bond
B. Header bond
C. Flemish bond
D. English bond

Answer: D

43. The clearance angle of a drill is …..

A. 3° to 5°
B. 8° to 12°
C. 12° to 20°
D. 15° to 20°

Answer: B

44. What is usually the included angle of the conical point of a scriber …..

A. 15°
B. 30°
C. 60°
D. 90°

Answer: A

45. One pascal is equal to …..

A. 1 Newton/mm²
B. 1 Newton/m²
C. 1 Newton/cm²
D. 1 Newton/dm²

Answer: B

46. Ferrous metal is an alloy of …..

A. iron and silicon
B. carbon and silicon
C. iron and carbon
D. manganese and silicon

Answer: C

47. In which pipes are used in water providing plants …..

A. C.I. Pipe
B. G.I. Pipe
C. A.C. Pipe
D. S.W. Pipe

Answer: A

48. Cast iron is used for manufacturing machine beds because …..

A. It is heavy in weight
B. It can resist more compressive stress
C. It is a cheaper metal
D. It is a brittle metal

Answer: B

49. A device installed in a drainage system to prevent reverse flow is …..

A. back water valve
B. back flow preventer
C. back siphonage
D. back vent pipe

Answer: A

50. In metric micro meters what is the pitch of the spindle thread

A. 0.1 mm
B. 0.5 mm
C. 0.2 mm
D. 0.01 mm

Answer: B

51. The pipe fitting used to connect a service pipe to a water main is called as …..

A. adjusting nut
B. ferrule
C. coupling
D. air valve

Answer: B

52. In septic tank the ventilation pipe usually provided is of …..

A. 100 mm dia
B. 150 mm dia
C. 75 mm dia
D. 50 mm dia

Answer: C

53. Flogging is the method of generating a mist for the application of …..

A. spray
B. soak
C. sanitizers
D. filtering

Answer: C

54. Gate valve is one of the most common valves used in the main supply lines to the …..

A. ventilating line
B. water supply system
C. back flow system
D. drainage system

Answer: B

55. Air lift pump is installed to draw more water from the deep well the pump is operated by …..

A. secondary electrical sources
B. acute air
C. compressed air
D. primary electrical sources

Answer: C

56. White metal is an alloy of

A. copper, lead, tin and antimony
B. copper, zinc and tin
C. copper, zinc, tin and Antimony
D. copper and tin

Answer: C

57. Dresser coupling and Victaulic joint basically are …..

A. back push joint
B. chemical joint
C. mechanical joint
D. adhesive joint

Answer: C

58. Which one of the following alloys can resist salt water corrosion …..

A. zinc alloy
B. gun metal
C. nickel chrome alloy
D. brass

Answer: A

59. The system of water distribution which is suited to a city growing irregularly is …..

A. grid iron system
B. radial system
C. ring system
D. tree system

Answer: D

60. Which tool is used for heating while carrying out soldering …..

A. torch lamp
B. blow lamp
C. holding lamp
D. winding lamp

Answer: B

61. The water closet having an integral part of trap S and P type out let have a water seal size of …..

A. 25 mm
B. 50 mm
C. 75 mm
D. 100 mm

Answer: C

62. Which type of tap is used for hot and cold water pipe line in a system …..?

A. Stop cock
B. 2 or 3 in mixer tap
C. one in one mixer
D. Direct mix of the O H T

Answer: B

63. Collar joint shall be finished of with a fillet sloping at a surface angle of …..

A. 15°
B. 25°
C. 35°
D. 45°

Answer: D

64. Sewer pipe may have to be laid under the condition of …..

A. Cushion
B. Trench
C. Length
D. Threading

Answer: B

65. A device used in kitchens serving hotels dinning rooms club houses and restaurants is …..

A. Grease basin
B. Yard basins
C. Garage basin
D. Oil catch basin

Answer: A

66. In a hot water system expansion / vent pipes are installed on the cylinder and boiler because they…..

A. Prevent air locks
B. Stop build up of lime
C. Supply cold water
D. Release excess steam and water

Answer: D

67. The pump attached with impeller and pump is …..

A. Mono block pump
B. Jet pump
C. Air lift pump
D. Rotary pump

Answer: A

68. For cutting thin tubing the most suitable pitch of the hack saw blade is …..

A. 1.8 mm
B. 0.8 mm
C. 1.4 mm
D. .1 mm

Answer: B

69. The hose pipe for the oxygen line is …..

A. Black
B. Maroon
C. Red
D. Brown

Answer: A

70. Dual systems of distribution means …..

A. Continues supply system
B. pumping and intermittent system
C. Gravity and Pumping system
D. Gravity and continues system

Answer: C

71. What are the materials required for flanged joint …..A. cement and hemp yarn

B. screw and washer
C. nut and bolt
D. lead and tin

Answer: C

72. How much clearance from wall to be kept while laying G.I. pipe internally

A. 1.5 cm
B. 2.5 cm
C. 3.5 cm
D. 4.5 cm

Answer: A

73. What is the general fixing height of wash basin from floor level …..

A. 80 cm
B. 70 cm
C. 60 cm
D. 65 cm

Answer: A

74. What is height of fixing of automatic cistern for urinal …..

A. 1800 mm
B. 1900 mm
C. 1600 mm
D. 1500 mm

Answer: B

75. How many types of flushing cisterns are available based on operation …..

A. 5 types
B. 3 types
C. 4 types
D. 2 types

Answer: D

76. What is the size of waste coupling for kitchen sink

A. 32 mm
B. 50 mm
C. 38 mm
D. 40 mm

Answer: B

77. the brick or stone used in corner masonry of a wall is called …..

A. king closer
B. blank space
C. quoin closer
D. mortar

Answer: C

78. Which part ensures uniform pressure on the measuring faces in a micrometer …..

A. ratchet stop
B. thimble
C. spindle
D. barrel

Answer: A

79. What is plate with a short handle and is used mainly to hold mortar. What is this tool …..

A. spade
B. shovel
C. hawk
D. joint filler

Answer: C

80. Rust is formed from iron and which other element …..

A. oxygen
B. hydrogen
C. nitrogen
D. sulpher

Answer: A

81. Spindle of gate valve rotates without closing due to …..

A. spindle thread badly worn-out
B. spindle is bend
C. gland nut loose
D. defective packing

Answer: A

82. What is the size of manhole generally constructed within compound for house drainage …..

A. 90 x 70 cm
B. 90 x 80 cm
C. 90 x 60 cm
D. 90 x 90 cm

Answer: B

83. Name the valve is used to regulate the pressure in pipe line …..

A. relief valve
B. needle valve
C. gate valve
D. check valve

Answer: A

84. what is the size of frog in brick …..

A. 100 mm length x 40 mm width x 10 to 20 mm depth
B. 100 mm length x 30 mm width x 10 mm to 25 mm depth
C. 100 mm length x 50 mm width x 10 mm to 15 mm depth
D. none of the above

Answer: A

85. Cross cut chisel is used for …..

A. chipping excess metal
B. curved grooves
C. key ways
D. corner

Answer: C

86. Which types of pipes can be cut easily by pipe cutter …..

A. S.W. pipe
B. C.I. Pipe
C. A.C. Pipe
D. G.I. Pipe

Answer: D

87. Name the apparatus used for testing slump …..

A. sand cone test
B. Mud cone test
C. Slump cone test
D. None of the above

Answer: C

88. Which method of casting C.I. pipes gives good result …..

A. sand casting
B. mud casting
C. centrifugal casting
D. none of the above

Answer: C

89. What is the range of S.W. pipes available in the market …..

A. 100 to 600 mm
B. 100 to 300 mm
C. 100 to 180 mm
D. 100 to 700 mm

Answer: A

90. Which side of mixing tap hot water line to be connected …..

A. right side
B. Left side
C. Middle side
D. Corner side

Answer: B

91. What is the term generally employed for a piece of pipe which is threaded on both ends and less than 12 incheslong?

A. coupling
B. nipple
C. union
D. plugs

Answer: A

92. Pipe wrench is used for pipes of diameter…..

A. less than 15 mm
B. more than 150 mm
C. 50 mm to 150 mm
D. 15 mm to 50 mm

Answer: D

93. If the globe valve begins to leak between the packing nut and valve steam …..

A. gland nut to be replaced
B. packing to be replaced
C. valve steam to be replaced
D. Bonnet to be replaced

Answer: B

94. the lower most level or surface of a sewer is known as …..

A. invert
B. bedding
C. benching
D. drain

Answer: A

95. What process is used to remove permanent hardness in water …..

A. purification process
B. coagulation process
C. base exchange process
D. sedimentation process

Answer: C

96. Dug wells are also known as …..

A. draw wells
B. tube wells
C. driven wells
D. artesian wells

Answer: A

97. What should be done to remove tapped air in centrifugal pump …..

A. packing
B. washing
C. use booster pump
D. priming

Answer: D

98. What is provided in elevated storage reservoir for circulation of air …..

A. manhole
B. ventilator
C. float gauge
D. over flow pipe

Answer: B

99. What type of bacteria treats waste in percolation area?

A. fungi
B. anaerobic
C. aerobic
D. lime

Answer: C

100. The cistern which is operated by a chain is called …..

A. Ball type cistern
B. Bell type cistern
C. Pull type cistern
D. Push type cistern

Answer: B

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