Question

Which of the following traps is used in a W.
C.?

• A. Gully trap
• B. Nahani trap
• C. P trap
• D. Bottle trap

Hint:

Common sanitary traps:
• P Trap $\rightarrow$ W.C. with horizontal outlet
• S Trap $\rightarrow$ W.C. with floor outlet
• Bottle Trap $\rightarrow$ Wash basin
• Gully Trap $\rightarrow$ External wastewater collection

Answer 1

The Correct Option is C

Concept: A trap is a plumbing fitting provided in sanitary systems to prevent the entry of foul gases from drainage pipes into buildings. Different types of traps are used for different sanitary fixtures:
• Gully trap
• Nahani trap
• P trap
• Bottle trap Each trap maintains a water seal that blocks sewer gases.

Step 1: Understand the trap used in W.C.
A P trap is commonly used in water closets (W.C.) where the outlet passes horizontally through the wall. The shape of the trap resembles the letter: \[ P \] It maintains an effective water seal to prevent foul smell from entering the room.

Step 2: Analyze the given options.
• Gully trap -- Used outside buildings to collect wastewater from baths, kitchens, and wash areas.
• Nahani trap -- Used in bathrooms and floor drainage systems.
• P trap -- Used in W.C. systems for preventing sewer gas entry. \checkmark
• Bottle trap -- Generally used below wash basins and sinks. Therefore, the correct answer is: \[ {\text{P trap}} \]