What is the correct compression-to-breath ratio for adult CPR?

The Resuscitation Council UK recommends 30 chest compressions followed by 2 rescue breaths for adult CPR. This ratio applies whether there is one rescuer or two. It maximises coronary perfusion while still providing ventilation.

How do you recognise cardiac arrest in a casualty?

Cardiac arrest is recognised when a person is unresponsive and not breathing normally. You should not spend time trying to find a pulse as this is unreliable. If in doubt, start CPR immediately.

They have a weak pulse and are confused

They are unresponsive and not breathing normally

They are breathing rapidly and clutching their chest

What is the recommended depth of chest compressions for an adult?

Chest compressions for an adult should depress the sternum by 5–6 cm. Compressions that are too shallow are ineffective at generating blood flow. Allow the chest to fully recoil between each compression.

Free mock exam

First Aid at Work — Free Mock Exam

Practise the First Aid at Work assessment with 25 questions pulled at random from a 200-question bank. Covers CPR ratios, choking, severe bleeding, shock, secondary survey and resuscitation. Used by UK electricians, site supervisors and apprentices preparing for HSE-recognised first aid certification.

Questions: 25
Time limit: 30
Pass mark: 70%
Bank size: 200

Free · no sign-up · timer can be ignored · retake as many times as you want

Sample questions

01What is the correct compression-to-breath ratio for adult CPR?
- A.30 compressions to 1 breath
- B.30 compressions to 2 breaths
- C.20 compressions to 2 breaths
- D.15 compressions to 2 breaths
Why: The Resuscitation Council UK recommends 30 chest compressions followed by 2 rescue breaths for adult CPR. This ratio applies whether there is one rescuer or two. It maximises coronary perfusion while still providing ventilation.
02How do you recognise cardiac arrest in a casualty?
- A.They have a weak pulse and are confused
- B.They are breathing rapidly and clutching their chest
- C.They are pale and sweating
- D.They are unresponsive and not breathing normally
Why: Cardiac arrest is recognised when a person is unresponsive and not breathing normally. You should not spend time trying to find a pulse as this is unreliable. If in doubt, start CPR immediately.
03What is the recommended depth of chest compressions for an adult?
- A.3–4 cm
- B.5–6 cm
- C.2–3 cm
- D.7–8 cm
Why: Chest compressions for an adult should depress the sternum by 5–6 cm. Compressions that are too shallow are ineffective at generating blood flow. Allow the chest to fully recoil between each compression.

FAQ

Is the First Aid at Work mock exam free?

Yes — 100% free, no sign-up needed. Questions are pulled at random from a substantial bank, with a worked explanation on every question after you submit.

Can I retake the mock exam?

Yes. Every attempt picks a different random selection and reshuffles the options, so each retake gives you genuinely new questions. No limit on retakes.

Does this count towards the real qualification?

No — this is independent practice material. To gain the actual qualification you need to sit the official assessment through an approved provider.