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 Blank

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 Blank

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 Blank

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 Blank

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?