Lesson 4.1.1

4.1.1 Density and upthrust Quiz: Pearson Edexcel Physics, Unit 4

20 questions

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Lesson 4.1.1, Density and upthrust: 20 multiple choice questions for the Pearson Edexcel Physics (9PH0), Unit 4: Materials, written with Revision Ninja.

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The 20 questions

  1. What is the physical definition of density for any material?

    • Mass per unit area
    • Mass per unit volume
    • Force per unit volume
    • Weight per unit volume

  2. According to Archimedes' principle, what is the upthrust acting on a submerged object?

    • Submerged object weight
    • Displaced fluid weight
    • Displaced fluid volume
    • Displaced fluid mass

  3. Why does a fluid exert an upward upthrust force?

    • Density decreases with depth
    • Pressure decreases with depth
    • Temperature increases with depth
    • Pressure increases with depth

  4. For an object floating in static equilibrium, how does upthrust compare to weight?

    • Less than weight
    • Equal to weight
    • Independent of weight
    • Greater than weight

  5. A floating object has density rho_o and the fluid has density rho_f. What fraction of the object's volume is submerged?

    • rho_o/rho_f
    • rho_f/rho_o
    • rho_o x rho_f
    • 1 - rho_o/rho_f

  6. Approximately what is the density of pure water?

    • 100 kg/m^3
    • 1 kg/m^3
    • 1000 kg/m^3
    • 10000 kg/m^3

  7. Which two quantities determine the magnitude of upthrust?

    • Object mass and volume
    • Object density and mass
    • Fluid density and depth
    • Fluid density and volume

  8. A block has mass 2.0 kg and volume 4.0 x 10^-3 m^3. What is its density?

    • 500 kg/m^3
    • 0.002 kg/m^3
    • 8000 kg/m^3
    • 2000 kg/m^3

  9. An object of volume 2.0 x 10^-4 m^3 is fully submerged in water of density 1000 kg/m^3. What is the upthrust? Take g = 9.8 N/kg.

    • 20 N
    • 0.20 N
    • 0.98 N
    • 2.0 N

  10. A floating block has density 600 kg/m^3 and floats in water of density 1000 kg/m^3. What percentage of its volume is submerged?

    • 167%
    • 40%
    • 600%
    • 60%

  11. A block of density 800 kg/m^3 has volume 0.050 m^3. What is its weight? Take g = 9.8 N/kg.

    • 390 N
    • 40 N
    • 4.0 N
    • 1600 N

  12. A block weighing 3.0 N floats with half of its volume submerged. What is the upthrust on it?

    • 1.5 N
    • 0 N
    • 3.0 N
    • 6.0 N

  13. An object weighs 5.0 N in air. It is fully submerged in water with volume 1.0 x 10^-4 m^3. What is its apparent weight in water? Take g = 9.8 N/kg.

    • 5.0 N
    • 6.0 N
    • About 4.0 N
    • 0.98 N

  14. A cube of mass 0.27 kg has side length 0.10 m. What is its density?

    • 27 kg/m^3
    • 270 kg/m^3
    • 2.7 kg/m^3
    • 2700 kg/m^3

  15. An object floats in oil of density 800 kg/m^3 with 75% of its volume submerged. What is its density?

    • 1067 kg/m^3
    • 600 kg/m^3
    • 800 kg/m^3
    • 200 kg/m^3

  16. Why does an object denser than water sink when fully submerged in water?

    • Drag exceeds weight
    • Upthrust exceeds weight
    • Weight exceeds upthrust
    • Weight equals upthrust

  17. A 2.0 kg object of density 500 kg/m^3 is fully submerged in water of density 1000 kg/m^3. What is the net force on it? Take g = 9.8 N/kg.

    • 19.6 N downward
    • 19.6 N upward
    • 58.8 N upward
    • 39.2 N upward

  18. Which property of a fluid directly affects the upthrust acting on an object?

    • Fluid density
    • Fluid surface tension
    • Fluid viscosity
    • Fluid temperature

  19. A block of density 2500 kg/m^3 and volume 1.0 x 10^-3 m^3 hangs from a string while fully submerged in water. What is the tension in the string? Take g = 9.8 N/kg.

    • 24.5 N
    • 34.3 N
    • 9.8 N
    • 14.7 N

  20. A 0.30 kg irregular solid has a volume of 1.5 x 10^-4 m^3 measured by displacement. What is its density?

    • 200 kg/m^3
    • 20000 kg/m^3
    • 2000 kg/m^3
    • 450 kg/m^3

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