D14 FACE THE CHALLENGE

Which device allows sewer gases to escape without entering the building?

• Vent pipe
• Soil pipe
• Floor trap
• Clean-out

Answer explanation

Vent pipes release gases above roof level, preventing foul odor inside buildings.

Which fitting is provided at the upper end of a drainage system for maintenance?

• Clean-out
• Gully trap
• Manhole
• Intercepting trap

Answer explanation

Clean-outs provide access to pipelines for cleaning and inspection.

Which of the following is not a function of house drainage?

• Disposal of rainwater
• Ventilation
• Wastewater removal
• Heat insulation

Answer explanation

House drainage primarily deals with collection and removal of wastewater, not insulation.

What is the function of a Nahani trap?

• Control pressure
• Connect roof pipe
• Drain bathroom water
• Remove grease

Answer explanation

Nahani traps are used to drain water from bathroom floors into the drainage line.

Septic tanks are usually constructed from:

• Wood
• Steel
• Reinforced cement concrete
• Glass

Answer explanation

RCC provides durability and watertightness essential for septic tank construction.

What is the standard size of a manhole cover used in roads?

• 200 mm
• 450 mm
• 600 mm
• 900 mm

Answer explanation

Manhole covers in roads are typically 600 mm in diameter to allow human entry and equipment.

Which of the following pipes is specifically used for removing kitchen waste?

• Rainwater pipe
• Waste pipe
• Soil pipe
• Vent pipe

Answer explanation

Waste pipes carry greywater from kitchens and sinks to the drainage system.

Why is a vent pipe extended above the roof level?

• Improve flow
• Provide lighting
• Prevent backflow
• Release gases safely

Answer explanation

Vent pipes extend above roof level to safely discharge sewer gases to the atmosphere.

A house drain must always be laid with a slope to:

• Reduce smell
• Increase pressure
• Ensure flow by gravity
• Support ventilation

Answer explanation

A proper slope ensures self-cleaning flow in drainage systems.

What is the typical shape of a floor trap?

• L-shaped
• Straight
• U-shaped
• T-shaped

Answer explanation

Floor traps are U-shaped to retain water and block foul gases.