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Rajasthan RBSE Senior Secondary (Class 12) Vocational Plumbing — Code 111 practice questions are available now; exam metadata is being verified.
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2026 Statistics
Key Facts: RBSE SS Voc Plumbing Exam
111
RBSE subject code for Plumbing
RBSE 2026 subject-wise statistics
100
Typical full marks for the subject scheme
RBSE syllabus examination scheme
3.15 hrs
Typical theory paper duration
RBSE Class 12 / Varishtha Upadhyaya syllabus scheme
33%
Typical minimum pass marks (confirm circular)
RBSE examination regulations
100
Free English MCQ study questions on this page
OpenExamPrep practice bank
RBSE Senior Secondary (Class 12) Vocational Plumbing (code 111) is a real Board of Secondary Education, Rajasthan public-examination subject with appeared candidates in the 2026 main examination subject-wise statistics. Typical scheme: Theory 80 + Sessional 20 = 100; passing generally 33% (and separate practical pass where applicable). Use these free MCQs for theory revision only.
Sample RBSE SS Voc Plumbing Practice Questions
Try these sample questions to test your RBSE SS Voc Plumbing exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1In a typical multi-storey residential building with an elevated overhead tank, fixture outlets on upper floors receive water mainly by:
A.Gravity head from the tank water level
B.Municipal main pressure alone without a tank
C.Steam pressure from a boiler only
D.Vacuum suction created by the tap
Explanation: An elevated storage tank supplies fixtures by gravity: the height difference between the free water surface and the outlet provides static head and flow. Municipal pressure may fill the tank via a pump or float valve, but day-to-day outlet pressure at fixtures is governed by tank head (minus losses).
2A soil pipe in building drainage is primarily intended to carry:
A.Rainwater only from the roof
B.Discharge from water closets and urinals (faecal waste)
C.Potable cold water to kitchen taps
D.Compressed air for pneumatic tools
Explanation: Soil pipes convey soil waste—mainly WC and urinal discharge containing faecal matter—to the drainage stack or sewer. Separate waste pipes may carry sullage from basins and sinks; rainwater is handled by rainwater pipes; potable water is a supply, not drainage.
3The main purpose of a water seal in a fixture trap is to:
A.Increase municipal water pressure at the tap
B.Filter drinking water for pathogens
C.Block sewer gases and vermin from entering the room through the fixture
D.Convert hard water into soft water
Explanation: A trap retains a water seal that forms a barrier against foul air, sewer gases, and insects rising from the drain. It does not treat drinking water, raise supply pressure, or soften hardness.
4A vent (or anti-siphonage) pipe connected to a drainage system is provided mainly to:
A.Carry hot water from the geyser to distant bathrooms
B.Increase soil pipe diameter automatically
C.Meter the quantity of sewage leaving the building
D.Admit air so traps are protected from siphonage and pressure fluctuations
Explanation: Vents equalize air pressure in the drainage network, preventing trap seals from being siphoned out or blown by positive pressure. They are not hot-water supply lines, size changers, or sewage meters.
5Compared with an S-trap, a P-trap under a wash basin is generally preferred in modern practice because it:
A.Discharges into a wall outlet and is less prone to self-siphonage than a deep S-trap to the floor
B.Doubles the water pressure of the cold supply
C.Eliminates the need for any waste pipe
D.Is always made of lead only
Explanation: P-traps turn horizontally into a wall waste and maintain a reliable seal with less risk of self-siphonage than tall S-traps discharging to the floor. Supply pressure and waste-pipe necessity are unrelated; materials vary (plastic, brass, etc.).
6In a two-pipe drainage system for buildings, soil and waste are typically:
A.Mixed freely in one untreated potable water riser
B.Kept in separate stacks with separate venting arrangements as designed
C.Discharged only through rainwater downpipes
D.Pumped under pressure into the cold-water tank
Explanation: Two-pipe systems separate soil (WC/urinal) from waste/sullage (basins, sinks, baths) with appropriate stacks and vents. Mixing with potable risers or rainwater leaders is wrong practice; sewage is not pumped into drinking-water storage.
7Horizontal drainage branches are laid to a minimum fall (gradient) so that:
A.The pipe always runs completely full under pressure like a water main
B.Rainwater is forced upward to the roof tank
C.Self-cleansing velocity is maintained and solids do not deposit in the pipe
D.Trap seals are intentionally emptied every day
Explanation: A designed fall keeps flow fast enough to transport solids (self-cleansing) without excessive scour. Building drains are gravity partially-full pipes, not pressurized full-flow mains; gradient is not for emptying traps daily or pumping to tanks.
8A gully trap is commonly used to:
A.Store potable water for drinking for seven days
B.Increase boiler steam temperature
C.Join two copper refrigeration lines
D.Receive sullage from baths/sinks/yards while maintaining a seal and preventing sewer gas entry
Explanation: Gully traps accept surface or sullage discharges outdoors or at floor level, retain a water seal, and connect to the drain while limiting gas and vermin. They are not potable storage or HVAC fittings.
9An inspection chamber (manhole) on a building drain is provided mainly so that:
A.The drain can be inspected, cleaned, and rodded at changes of direction or gradient
B.Municipal electrical cables can be stored dry
C.The water main pressure can be doubled
D.Rainwater is automatically chlorinated
Explanation: Inspection chambers give access for maintenance, clearing blockages, and checking alignment at junctions, bends, or grade changes. They are not electrical vaults, pressure boosters, or treatment plants.
10A floor trap (nahani trap) in wet areas is installed to:
A.Provide an open path for sewer gas into the bathroom
B.Collect floor wash water while retaining a seal against foul air
C.Act as a hot-water expansion vessel
D.Replace the need for a WC trap
Explanation: Floor traps collect surface wash water from bathrooms/kitchens and maintain a water seal. Leaving them dry breaks the seal; they do not expand hot water or replace WC traps.
About the RBSE SS Voc Plumbing Practice Questions
Verified exam format metadata for Rajasthan RBSE Senior Secondary (Class 12) Vocational Plumbing — Code 111 is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.