1.Easy
What does an SpO₂ reading measure?
- AThe percentage of haemoglobin carrying oxygen
- BThe total haemoglobin level
- CThe oxygen level in the brain
- DThe amount of carbon dioxide dissolved in the blood
2.Easy
Which organism causes tuberculosis?
- ACorynebacterium diphtheriae
- BPseudomonas aeruginosa
- CMycobacterium tuberculosis
- DStaphylococcus aureus
3.Easy
What causes the first heart sound (S1)?
- ABlood flowing quickly into the atria
- BThe heart muscle stretching in diastole
- CClosure of the mitral and tricuspid valves
- DClosure of the aortic and pulmonary valves
4.Medium
Why does a large, rapidly forming pericardial effusion lower the blood pressure?
- AIt causes the aortic valve to leak backwards into the ventricle
- BIt makes the heart muscle contract too strongly and too fast
- CIt dilates the arteries throughout the body
- DIt compresses the heart and stops the ventricles filling
5.Medium
Why should a simple face mask not be used with an oxygen flow below about 5 L/min?
- AOxygen cannot be humidified at low flows
- BThe mask delivers too much oxygen at low flows
- CThe elastic strap is too loose at low flows
- DExhaled CO₂ can collect in the mask and be rebreathed
6.Medium
Which feature of a COPD exacerbation most suggests that antibiotics are needed?
- AA mild sore throat that lasted for one day only
- BA dry, tickly cough with no sputum at all for a day
- CAn increase in purulent (green or yellow) sputum
- DA clear runny nose
7.Hard
A nurse looked after a patient for a shift before smear-positive pulmonary TB was diagnosed, without wearing a respirator. What should happen?
- ATake no action, as healthcare workers are immune to TB
- BStart a full six-month course of TB drugs at once without any tests
- CStay off work for six months in case symptoms develop
- DReport it so occupational health can arrange follow-up screening
8.Hard
A heavy smoker is having surgery tomorrow and asks whether stopping smoking now is pointless. Which reply is most accurate?
- AStopping now will make the operation more dangerous
- BIt is pointless unless they stopped smoking at least a year ago
- CStopping even today lowers carbon monoxide levels before surgery
- DSmoking before surgery protects the lungs from the anaesthetic gases
Answer key
- 1. A · The percentage of haemoglobin carrying oxygen
- 2. C · Mycobacterium tuberculosis
- 3. C · Closure of the mitral and tricuspid valves
- 4. D · It compresses the heart and stops the ventricles filling
- 5. D · Exhaled CO₂ can collect in the mask and be rebreathed
- 6. C · An increase in purulent (green or yellow) sputum
- 7. D · Report it so occupational health can arrange follow-up screening
- 8. C · Stopping even today lowers carbon monoxide levels before surgery
Full step-by-step solutions: practise this topic on examproblems.com.