CITB Operatives Mock Test – Excavations and Confined Spaces – CSCS Mock Test | CSCS Revision

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The CITB Operatives mock test below covers all the questions you’ll face from the Excavations and Confined Spaces section of the CITB Health, Safety and Environment Test in 2024.

There are 20 questions in this practice test and the pass mark is set at 18 out of 20, you will get a pass or fail result after submitting your answers.

Don’t forget to like, share, or comment if you found this CITB Operatives mock test on Excavations and Confined Spaces useful. Good luck!

1. Guard rails placed around the top of an excavation are meant to ___.

Prevent the sides of the trench from collapsing

Stop rainwater from running into the trench

Prevent people from falling into the trench

Stop toxic gas from forming at the bottom of the trench

Question 1 of 20

2. Methane gas is very dangerous in confined spaces because: (choose 2 answers)

It could make you feel dehydrated

It will block your vision

It will limit the amount of oxygen you have available

It could explode

Question 2 of 20

3. What should you do if you’re working in a deep trench and you start to feel dizzy?

Get out immediately and take everyone who is working with you then report it

Get out then take a few minutes then go back in

Sit down and take a few minutes to recover

Continue working and let the dizziness pass on its own

Question 3 of 20

4. You have to work in an excavation, what is the main hazard while working?

Suffering from skin abrasions

Being crushed if the sides are not supported

Falling

Breathing in hazardous dust from the ground

Question 4 of 20

5. Which of these is most likely if you're digging and notice a strange smell coming from the soil?

There might be buried services in the area

Nothing, this is normal

The soil could be contaminated

The area has been excavated before

Question 5 of 20

6. You have to work in a confined space and notice there is sludge at the bottom, what should you do before entering? (Choose 3 answers)

Toss an item into the sludge to determine how deep it is

Ensure you have the correct training

Ensure you are wearing a disposable dust mask

Ensure that the space is tested for gas

Find out what the sludge is

Question 6 of 20

7. What do yellow service pipes carry in relation to underground service pipes?

Electricity

Gas

Sewage and drain lines

Water

Question 7 of 20

8. What substance is probably present in the air if workers notice the smell of rotten eggs?

Hydrogen sulphide

Methane

Oxygen

Carbon dioxide

Question 8 of 20

9. What is the safest way of entering and exiting a deep excavation?

Via a fixed staircase

Via shoring or trench supports

Via an excavator bucket

Using ladders on the work-site

Question 9 of 20

10. What should you do if you notice the side supports moving around as you're working inside an excavation?

Nothing – this is normal

Move further down and continue working

Keep working but monitor the situation carefully

Make sure you and everyone else exit the excavation immediately

Question 10 of 20

11. Why is a person always positioned immediately outside of a confined space while work is taking place inside it?

To assess compliance with the method statement

To supervise work

To perform risk assessments

To begin the rescue process in an emergency situation

Question 11 of 20

12. What is the main cause of death among workers in confined spaces?

Too much oxygen

A lack of oxygen

Methane

Temperatures that cause hypothermia

Question 12 of 20

13. If you’re working in a confined space and the gas alarm goes off you should:

Stop using any electrical tools but carry on working

Take the alarm off

Continue working and take breaks every 5 minutes to get fresh air

Exit the confined space immediately

Question 13 of 20

14. If you need to hand dig near any electrical underground services you must use __.

A full metal shovel

A jack hammer

An insulated shovel or spade

A metal shovel and rubber gloves

Question 14 of 20

15. What should you do if you have to work in a confined space and realize your permit to work will expire before you can finish the work?

Continue working until the job is finished

Ask your supervisor to adjust the date on the permit

Leave the confined space before the permit expires

Give the permit to the next shift

Question 15 of 20

16. What does it mean if you digging and find a run of coloured marker tape?

Buried human remains are present

The soil is contaminated

It is not safe to dig in this area

There is a buried service

Question 16 of 20

17. What should you do if you’re working in a deep trench and notice a lorry with its engine running above you?

Continue working – the lorry will move eventually

Leave the trench immediately

Put on ear defenders to block out the noise

Continue working – this is normal

Question 17 of 20

18. What could happen if oxygen levels in a confined space drops below 8 percent?

Dehydration among workers

Hearing issues among workers

Workers may become unconscious

A fire or explosion could occur

Question 18 of 20

19. An excavation should be battered back or stepped if ___.

It’s more than 5m in depth

Buried services are present

There is a risk of the sides falling in, regardless of how deep it is

Water is present at the bottom of the trench

Question 19 of 20

20. Why should workers be fully trained and competent before they’re allowed to enter a confined space?

Only house-building sites have confined spaces

The potential hazards of entering a confined space must be fully understood

Confined spaces don't provide breathable air

Flammable or explosive gasses are always present in confined spaces

Question 20 of 20

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