IDC Guide

PADI IDC and IE Quiz 3: IDC Revision Topics

Physics of Diving Quiz

  1. What principle explains why a diver’s buoyancy changes at different depths?
    • A) Archimedes’ Principle
    • B) Pascal’s Law
    • C) Newton’s Third Law
    • D) Boyle’s Law
  2. Boyle’s Law relates to which aspects of diving?
    • A) Buoyancy and depth
    • B) Pressure and volume
    • C) Temperature and volume
    • D) Density and depth
  3. What happens to air consumption as a diver descends deeper?
    • A) Increases
    • B) Decreases
    • C) Remains the same
    • D) Fluctuates unpredictably
  4. According to Henry’s Law, what happens to the amount of gas dissolved in a liquid as pressure increases?
    • A) Increases
    • B) Decreases
    • C) Remains the same
    • D) Becomes toxic
  5. Which law explains why a diver must equalize their ears as they descend?
    • A) Boyle’s Law
    • B) Charles’ Law
    • C) Dalton’s Law
    • D) Archimedes’ Principle
  6. What is the primary cause of nitrogen narcosis?
    • A) Decreased oxygen levels at depth
    • B) Increased nitrogen absorption under pressure
    • C) Rapid ascent to the surface
    • D) Cold water temperatures
  7. What effect does increased pressure have on the density of air in a scuba tank?
    • A) Increases density
    • B) Decreases density
    • C) No effect
    • D) Makes it more humid
  8. Dalton’s Law is important in diving because it helps to understand:
    • A) Buoyancy control
    • B) Partial pressures of gases
    • C) Underwater navigation
    • D) Finning techniques
  9. What is the primary reason for conducting a safety stop during ascent?
    • A) To admire marine life
    • B) To allow gases to safely off-gas from tissues
    • C) To check diving equipment
    • D) To adjust to the water temperature
  10. Which factor affects a diver’s buoyancy underwater?
    • A) The color of their wetsuit
    • B) The depth of the water
    • C) The time of day
    • D) The type of marine life present

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