8202 Principles 6

Multiple Choice

Which of the following base quantities is measured in kilograms according to the SI system?

• Length

• Mass

• Time

• Electric current

Multiple Choice

Which of the following is the correct SI unit for pressure?

• N/m²

• N

• m/s

• l/s

Multiple Choice

Select all the quantities that are measured using three dimensions.

• Area

• Volume

• Force

• Pressure

Fill in the Blanks

What is the formula for calculating pressure? Pressure =

/ Area

Multiple Select

Which statement(s) correctly describe the direction of pressure exerted by solids and liquids?

• Solids exert pressure only downwards.

• Liquids exert pressure only downwards.

• Liquids exert pressure downwards and outwards.

• Solids exert pressure downwards and outwards.

Multiple Choice

Which of the following best describes the difference between static pressure and dynamic pressure in plumbing systems?

• Static pressure is when water is stationary, dynamic pressure is when water is flowing.

• Static pressure is when water is flowing, dynamic pressure is when water is stationary.

• Static pressure is only measured in pipes, dynamic pressure is only measured in tanks.

• Static pressure is affected by gravity, dynamic pressure is not.

Multiple Select

Which units are commonly used to measure pressure in the plumbing industry? Select all that apply.

• Bar

• Pascal

• Meters head

• PSI

Open Ended

Explain how head height affects the intensity of pressure in a plumbing system, and why this is important for water flow.

Fill in the Blanks

Fill in the blank: Atmospheric pressure at sea level is

kPa.

Multiple Choice

What happens to the water in the pipe when the tap is closed?

• It flows out of the tap

• It is at rest

• It evaporates

• It increases in pressure

Multiple Choice

If a cistern holds 40 litres of water, what is the force of water leaving the tap?

• 392N

• 40N

• 9.81N

• 400N

Open Ended

Explain how reducing the diameter of a pipe affects the speed, pressure, and flow rate of water.

Multiple Select

Which of the following factors can affect the flow rate in a plumbing system?

• Pipe size

• Pressure

• Frictional resistance

• Temperature

Fill in the Blanks

A litre of water at its most dense (at 4°C) weighs

kg.

Multiple Choice

What is the equivalent length of pipe for 10 elbows in a plumbing system?

• 3.7m

• 0.37m

• 2.6m

• 1.0m

Open Ended

Explain how increasing the pipe diameter affects the velocity and flow rate of water in a plumbing system. Use examples from bath and basin feeds.

Multiple Choice

Which of the following changes in pipework will help increase the flow rate in a plumbing system?

• Replacing elbows with machined bends

• Decreasing pipe diameter

• Adding more elbows

• Using stop valves

Multiple Select

Which of the following fittings contribute to the resistance in pipework?

• Elbow

• Tee

• Stop valve

• Pulled bend

Multiple Choice

In a property with a CWSC in the loft, where is the water pressure likely to be the lowest?

• Ground floor basin

• First floor bath

• Kitchen sink

• CWSC outlet

Fill in the Blanks

The SI unit for mass is

Open Ended

Reflecting on today's lesson about SI units, which base quantity do you think is most important in plumbing, and why?