PPL Principles of Flight Exam Prep: Free Mock Test & Practice Questions

PPL Principles of Flight Exam Prep

Lift, drag, stalls and stability — the physics paper.

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Q1. According to Bernoulli's theorem, as the speed of airflow over a surface increases, what happens to the static pressure in that flow?

A. It decreases
B. It increases
C. It remains constant
D. It fluctuates randomly

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✓ Answer: A. It decreases

Bernoulli's theorem states that for an incompressible, non-viscous flow, the sum of static and dynamic pressure remains constant along a streamline. As velocity (and therefore dynamic pressure) increases, static pressure must decrease to keep total energy constant. This is the basic principle used to explain the pressure difference generated over a cambered aerofoil.

Q2. At which flight condition is total drag at its minimum for a given aircraft configuration?

A. At the stalling speed
B. At the maximum speed in level flight
C. At the speed for best lift/drag ratio
D. At the speed for minimum power required

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✓ Answer: C. At the speed for best lift/drag ratio

Total drag is lowest at the speed corresponding to the best lift/drag ratio, where induced and parasite drag curves cross. This is not the same speed as minimum power required, which occurs at a slightly lower airspeed.

Q3. In a level, coordinated 60-degree banked turn, the load factor is approximately 2, so the stalling speed relative to the 1g stall speed increases by a factor of approximately:

A. 1.1
B. 1.2
C. 1.4
D. 1.7

Show answer & explanation

✓ Answer: C. 1.4

Stalling speed varies with the square root of the load factor. At 60 degrees of bank the load factor is 2, and the square root of 2 is approximately 1.4, so the stall speed increases by roughly 40% compared with the 1g stall speed.

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PPL Principles of Flight Exam Prep — common questions

Frequently asked

How many questions are in the PPL Principles of Flight 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 Principles of Flight 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 45 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.