Lesson 3.2.4

3.2.4 Density and pressure Quiz: OCR Physics, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.2.4, Density and pressure: 20 multiple choice questions for the OCR Physics (H156), Unit 2: Forces and motion, written with Revision Ninja.

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The 20 questions

  1. How is density defined using mass and volume?

    • Weight divided by area
    • Mass times volume
    • Mass divided by volume
    • Volume divided by mass

  2. The pascal (Pa) is equivalent to:

    • N m^-2
    • kg m^-1 s^-1
    • N m^2
    • J m^-2

  3. The pressure at depth h in a liquid of density rho is (ignoring atmospheric pressure):

    • p = rho g h
    • p = rho g / h
    • p = rho h / g
    • p = rho + g h

  4. According to Archimedes' principle, upthrust on an object equals the weight of:

    • Displaced volume
    • Surrounding fluid
    • The object itself
    • Displaced fluid

  5. What microscopic mechanism causes gas pressure on a container wall?

    • Viscous drag
    • Collisions transferring momentum
    • Electrostatic repulsion
    • Gravitational attraction

  6. Which force balances the weight of an object floating in equilibrium?

    • Drag
    • Tension
    • Normal contact force
    • Upthrust

  7. Which combination of base units is equivalent to the pascal?

    • kg m^-1 s^-2
    • kg m s^-2
    • kg m^2 s^-2
    • kg m^-2 s^-1

  8. A 0.6 kg block of volume 1.0 x 10^-3 m^3 is fully submerged in water of density 1000 kg m^-3. What is the net force on it when released? Use g = 9.8 m s^-2.

    • 15.7 N upwards
    • 9.8 N upwards
    • 3.9 N upwards
    • 5.9 N downwards

  9. A mass of 780 g has a volume of 1000 cm^3. What is its density in kg m^-3?

    • 1280 kg m^-3
    • 780 kg m^-3
    • 7.8 kg m^-3
    • 7.8 x 10^5 kg m^-3

  10. A 2.5 kg mass has a density of 1250 kg m^-3. What volume does it occupy, in m^3?

    • 0.0008 m^3
    • 0.05 m^3
    • 0.002 m^3
    • 0.5 m^3

  11. A force of 300 N acts uniformly over an area of 0.05 m^2. What is the pressure?

    • 15000 Pa
    • 150 Pa
    • 6000 Pa
    • 6 Pa

  12. The pressure at a depth of 5 m in fresh water (density 1000 kg m^-3) is, using g = 9.8 m s^-2:

    • 9.8 x 10^3 Pa
    • 5.0 x 10^3 Pa
    • 4.9 x 10^4 Pa
    • 1.0 x 10^5 Pa

  13. A block of volume 0.002 m^3 is fully submerged in water of density 1000 kg m^-3. Using g = 9.8 m s^-2, what is the upthrust?

    • 196 N
    • 19.6 N
    • 9.8 N
    • 2.0 N

  14. A force of 2.0 x 10^5 Pa acts on an area of 0.4 m^2. What is the force?

    • 5.0 x 10^5 N
    • 8.0 x 10^5 N
    • 8.0 x 10^3 N
    • 8.0 x 10^4 N

  15. A 600 N person stands on one foot with a contact area of 0.015 m^2. What pressure does the foot exert on the floor?

    • 9.0 x 10^3 Pa
    • 8.0 x 10^4 Pa
    • 4.0 x 10^3 Pa
    • 4.0 x 10^4 Pa

  16. An 80 N cube with side 0.2 m stands on a flat floor. What pressure does it exert?

    • 200 Pa
    • 8000 Pa
    • 400 Pa
    • 2000 Pa

  17. A block of density 600 kg m^-3 floats in water of density 1000 kg m^-3. What fraction of its volume is submerged?

    • 40%
    • 6%
    • 166%
    • 60%

  18. The pressure difference between depths of 2 m and 10 m in sea water of density 1025 kg m^-3 is, using g = 9.8 m s^-2:

    • 8.0 x 10^4 Pa
    • 2.0 x 10^4 Pa
    • 1.6 x 10^4 Pa
    • 1.0 x 10^5 Pa

  19. A solid of density 2700 kg m^-3 and volume 0.001 m^3 is weighed. Using g = 9.8 m s^-2, what is its weight?

    • 275 N
    • 26.5 N
    • 2.7 N
    • 2.8 N

  20. What is the approximate density of pure ice in kg m^-3?

    • 1000
    • 917
    • 950
    • 850

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