IAF Fighter Pilot Physics MCQs

By: Prof. Dr. Fazal Rehman | Last updated: May 20, 2025

1. What is the primary force that allows a fighter jet to stay airborne?
(A) Thrust
(B) Drag
(C) Lift
(D) Weight

2. The lift on an aircraft wing is mainly generated due to:
(A) Pressure difference above and below the wing
(B) Weight of the aircraft
(C) Engine thrust
(D) Wing surface friction

3. What is Mach number?
(A) Ratio of aircraft speed to speed of light
(B) Ratio of aircraft speed to speed of sound
(C) Ratio of thrust to drag
(D) Ratio of lift to weight

4. Supersonic flight occurs when Mach number is:
(A) Less than 1
(B) Exactly 1
(C) Greater than 1
(D) Equal to zero

5. What happens to air density as altitude increases?
(A) Increases
(B) Decreases
(C) Remains constant
(D) First increases then decreases

6. Which law explains the conservation of momentum in aircraft propulsion?
(A) Newton’s First Law
(B) Newton’s Second Law
(C) Newton’s Third Law
(D) Bernoulli’s Principle

7. What type of drag increases with the square of velocity?
(A) Induced drag
(B) Parasite drag
(C) Wave drag
(D) Form drag

8. Which part of the aircraft controls its pitch?
(A) Ailerons
(B) Rudder
(C) Elevators
(D) Flaps

9. When flying at supersonic speeds, which phenomenon occurs due to sudden pressure changes?
(A) Shock waves
(B) Turbulence
(C) Laminar flow
(D) Vortex shedding