CSCS Mock Test for Plumbers – CSCS Mock Test | CSCS Revision

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CSCS mock test for plumbers 2026 – 37 up-to-date CSCS test questions for plumbers taking the 2026 test.

Test your knowledge with these 37 plumber-specific practice questions covering common site hazards, PPE, manual handling, hot works, gas safety, excavation safety, and safe working practices.

Each question covers key health and safety topics plumbers are expected to understand on construction sites. Complete the mock test, check your answers, and identify any areas where you may need a little extra revision before the real exam. The pass mark is 30 out of 37.

1. Why should LPG cylinders normally be kept upright and not laid on their side while in use?

Liquid gas could enter the supply line, creating a serious safety risk

It could cause an incorrect reading on the contents gauge and lead to flashback

Air could enter the cylinder and create a hazardous gas mixture

The gas level would be too low for the torch to operate correctly

Question 1 of 37

2. You need to refit part of an external rainwater pipe using a power drill in wet weather. Which drill is the safest option?

A drill powered by a 240-volt supply

Any mains-powered drill fitted with a circuit breaker

A drill running from a 110-volt supply

A cordless battery-powered drill

Question 2 of 37

3. What is the safest way to fit a flue liner into an existing chimney?

Access the chimney through the loft space and insert the liner from there

Work in pairs and fit the liner from roof level while standing on the roof

Install the liner from roof level while working from a roof ladder

Work in pairs and install the liner from roof level using a chimney scaffold

Question 3 of 37

4. Before using an electrically powered pipe-threading machine, which safety rule is most important?

The machine should operate on a 400-volt supply and have a guard fitted

The machine should operate on a 24-volt supply and have a guard fitted

Make sure loose clothing cannot become caught in moving parts

Ear protection should be available and in good condition

Question 4 of 37

5. Which statement about propane and butane is correct?

Propane is heavier than air, but butane is lighter than air

Both propane and butane are lighter than air

Butane is heavier than air, but propane is lighter than air

Both propane and butane are heavier than air

Question 5 of 37

6. How should gas cylinders be positioned when using oxy-acetylene welding equipment?

Leaning at a 45-degree angle

Positioned upside down

Laid on their side and secured in place

Kept upright and properly secured

Question 6 of 37

7. When using a blowtorch close to timber, what safety precautions should be taken?

Carry out the work carefully to avoid setting fire to the timber

Direct the flame away from the timber and have sand available to extinguish a fire

Use a fire-resistant mat and keep a fire extinguisher nearby

Soak the timber with water beforehand and keep a bucket of water close by

Question 7 of 37

8. Before attempting to lift a roll of Code 5 lead, what should you do first?

Test-lift it to judge its weight

Carry out a full assessment of the lifting task

Check the weight of the roll

Ask a colleague to help immediately

Question 8 of 37

9. You arrive on site and notice that the ladder required for roof access has been painted. What should you do?

Do not use it and report the issue to your supervisor

Use the ladder only if it is metal

Use the ladder only if it is wooden

Use it if you are wearing non-slip footwear

Question 9 of 37

10. When should safety glasses or goggles be worn while drilling?

At all times when carrying out drilling work

Only when using a drill bit larger than 20 mm

Only when drilling above your head

Only when drilling into concrete

Question 10 of 37

11. Why should temporary bonding be installed before removing and replacing sections of metal pipework?

To reduce the risk of a fuse blowing

To stop the pipework from corroding

To ensure the pipework remains continuously earthed throughout the work

To keep the electrical circuit energised

Question 11 of 37

12. During work, you discover a hard, white, powder-like substance that may contain asbestos. What should you do?

Wet the material and remove it before continuing with the task

Stop working immediately and report the material to your supervisor

Move the material aside and replace it after the job is completed

Put on respiratory protection and remove the material safely

Question 12 of 37

13. What is the safest way to check for gas leaks when setting up LPG equipment?

Smell around the joints for escaping gas

Apply a leak-detection solution to the connections

Listen carefully for a hissing sound

Use a lit match to look for leaks

Question 13 of 37

14. Where should oxy-acetylene cylinders be stored when not in use?

Left in the work area ready for the next shift

Inside company vehicles

In a locked cupboard within a building

In a designated outdoor gas storage area

Question 14 of 37

15. What colour is used to identify an acetylene gas cylinder?

Green

Black

Maroon

Orange

Question 15 of 37

16. What equipment should be used to check whether a solid wall contains hidden electrical cables before drilling?

A neon screwdriver

A multimeter

A cable detection device

A hammer and chisel

Question 16 of 37

17. You need to replace underground drainage pipework in a trench approximately 2.5 metres deep. The trench walls show signs of collapsing. What should you do?

Ask a colleague to pass materials down while you continue working

Continue working and complete the task as quickly as possible

Wear a safety rope so you can be pulled out if necessary

Stop work until the trench sides have been properly supported

Question 17 of 37

18. Why is it important for workers to understand the difference between propane and butane equipment?

Propane equipment costs less to use

Propane equipment uses smaller cylinders

Propane equipment operates at a higher pressure

Propane equipment operates at a lower pressure

Question 18 of 37

19. You are removing guttering from a large, single-storey industrial-style building and expect the work to last most of the day. Which access equipment is most suitable?

A mobile tower scaffold

A trestle scaffold

A putlog scaffold

A ladder

Question 19 of 37

20. In which of the following locations is Legionella bacteria most likely to be found?

A cold-water storage tank with water at 10°C

A shower hose or shower outlet

A boiler operating at 80°C

A toilet bowl

Question 20 of 37

21. What precaution should be taken when using pipe-freezing equipment to repair a burst water pipe?

Do not use pipe-freezing equipment on plastic pipework

Always have another person present when using the equipment

Wear protective gloves to stop the freezing agent contacting your skin

Prevent freezing gas from touching standing water directly

Question 21 of 37

22. When using a blowtorch near flexible pipe insulation, what should you do first?

Remove at least 1 metre of insulation on both sides of the work area

Dampen the insulation and leave it in place

Remove at least 3 metres of insulation on both sides of the work area

Remove only the amount of insulation needed to complete the task

Question 22 of 37

23. What PPE should be used to protect your eyes from infrared radiation during flame cutting or welding?

A high-visibility vest

Impact-resistant safety goggles

Respiratory protective equipment (RPE)

Eye protection fitted with a suitable tinted or filter lens

Question 23 of 37

24. How can Legionella bacteria be transmitted to people?

By breathing in fine water droplets or mist containing the bacteria

Through direct skin contact

From another person coughing or sneezing

By drinking contaminated water

Question 24 of 37

25. After handling sheet lead, how is lead most likely to enter your body?

By eating without washing your hands first

By not wearing eye protection

By not wearing the correct respiratory protection

By remaining in contaminated work clothing

Question 25 of 37

26. On a plumbing project where noise levels are high, who would normally carry out a noise assessment?

A competent person

A qualified plumber

The site supervisor

The site engineer

Question 26 of 37

27. You need to drill a 100 mm hole through a brick wall using a large hammer drill. What PPE is most appropriate?

Hearing protection, respiratory protection, and barrier cream

Gloves, breathing apparatus, and hearing protection

Hearing protection, respiratory protection, and eye protection

Barrier cream, safety boots, and respiratory protection

Question 27 of 37

28. What should you do if a cast iron bath is too heavy for you to move on your own?

Refuse to move it

Get another person to assist with the lift

Attempt to lift it again yourself

Find a lifting attachment or accessory

Question 28 of 37

29. For which joining process is oxy-acetylene equipment generally not the recommended choice?

Joining mild steel tubing

Welding sheet lead

Brazing or hard soldering copper pipe

Joining copper tube using capillary soldered fittings

Question 29 of 37

30. Under what circumstances can workers be transported in the back of a van?

When suitable seats and seat belts are provided

When the driver is over 21 years old

When the driver holds a heavy goods vehicle licence

When temporary seats have been installed

Question 30 of 37

31. What injury is most likely when cutting large-diameter pipe?

Cutting your hand on the sharp inner edge of the pipe after cutting

A piece of metal breaking off and striking you

Muscle damage from prolonged use of the cutting tool

Fingers becoming trapped between the pipe and cutting wheel

Question 31 of 37

32. You have lifted six 3-metre floorboards in an occupied building but must leave for an urgent job. What is the safest action?

Secure and cordon off the work area before leaving

Permanently fix all floorboards and coverings before leaving

Warn nearby workers to be careful while you are away

Leave the area exactly as it is

Question 32 of 37

33. What is the safest way to transport long lengths of copper pipe in a van?

Transport the pipes using a roof-mounted pipe rack

Secure the pipes to the roof using copper wire

Place the pipes inside the van with one end sticking out of the passenger window

Have a passenger hold the pipes on the roof rack while travelling

Question 33 of 37

34. Why must extra care be taken when moving or handling oxygen cylinders?

They are stored under very high pressure

They contain highly flammable liquid gas

They contain poisonous gas

They contain highly flammable compressed gas

Question 34 of 37

35. When replacing an immersion heater in a hot water cylinder, how can you ensure the electrical supply is dead before beginning work?

Switch off the power and test the circuit

Isolate the supply at the consumer unit or mains board and then test the circuit

Switch off the power and cut through the cable using insulated pliers

Switch off and disconnect the immersion heater supply

Question 35 of 37

36. If you need to move a cast iron boiler over a distance, what is the safest option?

Use a suitable trolley or other handling equipment

Roll it end over end

Drag it along the ground

Ask a colleague to help carry it

Question 36 of 37

37. If you are using a blowtorch to join copper pipes and fittings inside a home, where should a fire extinguisher be kept?

A fire extinguisher is not required

In your vehicle, provided it is locked

Only available when the property is occupied

Close to the work area and ready for immediate use

Question 37 of 37

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