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PPL Human Performance Exam Prep

The body and mind in flight — hypoxia, vision, decision making.

Pass mark 9/12 30 minutes UK CAA How many can I get wrong?
Sit a full mock under the clock at least once. Nerves are half the battle.
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Try 3 real PPL Human Performance Exam Prep questions
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Q1. Approximately what percentage of the Earth's atmosphere at sea level is oxygen?
  • A.  21%
  • B.  78%
  • C.  16%
  • D.  1%
Show answer & explanation
✓ Answer: A. 21%
Sea level air is about 78% nitrogen, 21% oxygen, and around 1% other gases such as argon and carbon dioxide. 21% oxygen is the figure pilots must know because it applies at ALL altitudes - only the total air pressure changes, not the percentage.
Q2. Why should a pilot avoid looking directly at a faint light source at night?
  • A.  Because the fovea has no rod cells and is poor at detecting dim light
  • B.  Because the pupil constricts when staring, reducing light entry
  • C.  Because staring causes rapid rhodopsin bleaching in cones
  • D.  Because the optic disc faces forward in low light
Show answer & explanation
✓ Answer: A. Because the fovea has no rod cells and is poor at detecting dim light
At night, off-centre viewing (using peripheral retina, rich in rods) is more effective because the rod-free fovea cannot detect very dim light. This is why 'off-set viewing' is taught for spotting faint lights or other aircraft at night. Direct fixation on a faint object can make it seem to disappear.
Q3. A pilot recovers from a prolonged, coordinated spin. What vestibular illusion is this manoeuvre classically associated with?
  • A.  The graveyard spin illusion, where the pilot senses rotation has stopped before it actually has
  • B.  Somatogravic illusion of climbing
  • C.  Coriolis illusion from head movement alone
  • D.  The break-off phenomenon
Show answer & explanation
✓ Answer: A. The graveyard spin illusion, where the pilot senses rotation has stopped before it actually has
In a prolonged spin, endolymph fluid eventually matches the rotation rate, so sensation of turning fades. On recovery, the fluid continues moving briefly, giving a false sensation of spinning the opposite way (the graveyard spin), which can tempt a pilot to re-enter the original spin.
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Topic drills
Ten quick questions on one topic, marked instantly with explanations.
1 free drill left — then a free account unlocks 3 + a full mock.
Oxygen, hypoxia & the atmosphere · 35
Vision, hearing & spatial disorientation · 41
G-forces, motion sickness & the ear · 35
Fitness, medication, alcohol & fatigue · 33
Stress, workload & decision making · 36
Threat & error management · 35
PPL Human Performance Exam Prep — common questions
Frequently asked
How many questions are in the PPL Human Performance Exam Prep?
The exam has 12 questions. Every Revision Robin mock uses the same 12-question format so your practice matches the real thing.
What is the pass mark for the PPL Human Performance Exam Prep?
You need 9 out of 12 correct to pass, which is about 75%. Our mocks mark you against this exact threshold.
How long do you get?
The test is timed at 30 minutes. Our full mock runs on the same clock so you can practise your pacing.
Are these the real exam questions?
No. Our questions are original and written to match the current syllabus, so they give realistic practice without copying the official paper. Every answer comes with a plain-English explanation. Always confirm current rules and content with UK CAA.