Question 1

Which of the following best describes a soil stack in plumbing?

Accepted Answer

A vertical pipe that carries sewage and waste water from fixtures to the drainage system

Answer

A horizontal pipe connecting two fixtures

Answer

A pipe for venting air from the drainage system

Answer

A pipe that supplies clean water to fixtures

Question 2

What is the primary purpose of a trap in plumbing systems?

Accepted Answer

To prevent foul odors from entering the building

Answer

To increase water pressure in the pipes

Answer

To connect different sections of pipework

Answer

To allow easy access for cleaning purposes

Question 3

What is the maximum permitted length for a horizontal waste pipe without a slope?

Accepted Answer

3 meters

Answer

10 meters

Answer

1 meter

Answer

6 meters

Question 4

What is the role of a vent pipe in a plumbing system?

Accepted Answer

To allow air into the drainage system to prevent vacuum and ensure proper drainage

Answer

To filter impurities from water

Answer

To increase water pressure in the pipes

Answer

To carry wastewater to the sewage system

Question 5

What is the typical minimum diameter required for a waste pipe serving a kitchen sink?

Accepted Answer

32 mm

Answer

40 mm

Answer

50 mm

Answer

25 mm

Question 6

What is the function of a backflow preventer in plumbing systems?

Accepted Answer

To prevent contaminated water from flowing back into the clean water supply

Answer

To increase water pressure

Answer

To filter debris from the water supply

Answer

To regulate the temperature of hot water

Question 7

Which of the following is a critical factor when installing sanitary appliances to ensure proper function?

Accepted Answer

Level installation

Answer

Weight distribution

Answer

Material texture

Answer

Color coordination

Question 8

What is a common method for joining PVC pipes in plumbing installations?

Accepted Answer

Solvent welding

Answer

Soldering

Answer

Screwing

Answer

Welding

Question 9

Which of the following appliances typically requires a dedicated drainage system?

Accepted Answer

Washing machine

Answer

Refrigerator

Answer

Microwave

Answer

Dishwasher

Question 10

Which type of pipe is often used for drains and soil stacks due to its durability and resistance to corrosion?

Accepted Answer

Cast iron

Answer

Polyethylene

Answer

PVC

Answer

Copper

Question 11

Which of the following materials is commonly used for installing sanitary pipework in plumbing systems?

Accepted Answer

PVC

Answer

Copper

Answer

Glass

Answer

Wood

Question 12

Which component is essential for connecting a toilet to the waste drainage system?

Accepted Answer

Soil pipe

Answer

Cold water supply pipe

Answer

Overflow pipe

Answer

Vent pipe

Question 13

What is the purpose of a flush valve in a toilet system?

Accepted Answer

To control the flushing mechanism

Answer

To supply cold water

Answer

To hold waste

Answer

To trap sewer gases

Question 14

What is the recommended slope for a horizontal waste pipe to ensure proper drainage?

Accepted Answer

1 in 40

Answer

1 in 60

Answer

1 in 20

Answer

1 in 100

Question 15

Which type of toilet is designed to use less water per flush than traditional models?

Accepted Answer

Low-flow toilet

Answer

Gravity-flush toilet

Answer

Dual-flush toilet

Answer

Pressure-assisted toilet

Question 16

Which material is commonly used for soil and waste pipes in drainage systems?

Accepted Answer

PVC

Answer

Copper

Answer

Cast iron

Answer

Polypropylene

Question 17

What is the purpose of a soil stack in plumbing systems?

Accepted Answer

To allow for the waste and sewage to be vented and drained away

Answer

To supply fresh water

Answer

To support the building structure

Answer

To heat the water

Question 18

What is the primary function of a P-trap in plumbing?

Accepted Answer

To prevent sewer gases from entering the building

Answer

To increase water pressure

Answer

To filter out debris

Answer

To provide hot water

Question 19

What is the standard diameter for most residential drainage pipes?

Accepted Answer

4 inches

Answer

2 inches

Answer

8 inches

Answer

6 inches

Question 20

What is the primary function of a mixing valve in a plumbing system?

Accepted Answer

To blend hot and cold water to a desired temperature

Answer

To measure water flow

Answer

To increase water pressure

Answer

To filter contaminants

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