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Grade 8 Science practice sheet

Alberta Curriculum · from Gradelings · Name: ______________________

  1. Question 1

    Which is a solution?

    • sugar completely dissolved in water
    • sand stirred into water
    • oil floating on vinegar
    • pebbles in a bucket
    Show answer

    sugar completely dissolved in water

    Hint: A solution looks like one material because the solute is spread evenly through the solvent.

  2. Question 2

    What happens to the particles of a substance when it is heated?

    • They move faster.
    • They shrink.
    • They stop moving.
    • They disappear.
    Show answer

    They move faster.

    Hint: Heat adds energy, so particles move faster.

  3. Question 3

    Which factor does NOT directly change how fast a liquid flows through a pipe?

    • the width of the pipe
    • the length of the pipe
    • the colour of the liquid
    • the viscosity of the liquid
    Show answer

    the colour of the liquid

    Hint: Narrow, long pipes and thick fluids slow flow. Colour does not matter.

  4. Question 4

    Which state of matter usually has the lowest density?

    • They are all the same.
    • solid
    • gas
    • liquid
    Show answer

    gas

    Hint: Gas particles are very far apart.

  5. Question 5

    A force of 80 N pushes on an area of 4 m². What is the pressure in Pa (N/m²)?

    answer boxPa

    Show answer

    20 Pa

    Hint: Pressure = force ÷ area.

  6. Question 6

    How does the heart act like the pump in a hydraulic system?

    • It stores air in tanks.
    • It removes all pressure.
    • It pushes fluid through a network of tubes.
    • It changes the fluid into a solid.
    Show answer

    It pushes fluid through a network of tubes.

    Hint: Both pumps create the pressure that moves a fluid.

  7. Question 7

    What are the products of cellular respiration?

    • energy, carbon dioxide and water
    • glucose and oxygen
    • only sugar
    • only oxygen
    Show answer

    energy, carbon dioxide and water

    Hint: Cells use glucose and oxygen to release energy, making carbon dioxide and water.

  8. Question 8

    Several tissues working together to do a job make up an…

    • organelle
    • atom
    • organism
    • organ
    Show answer

    organ

    Hint: The heart is an organ made of muscle, nerve and other tissues.

  9. Question 9

    Put these levels of organization in order from smallest to largest.

    • 🔬Cell
    • 🫀Organ
    • 🫁Organ system
    • 🧍Organism
    Show answer

    Cell → Organ → Organ system → Organism

    Hint: Cells make tissues, tissues make organs, organs work in systems, and systems make up an organism.

  10. Question 10

    For a washing machine, is each item an input or an output?

    Sort into: ⬇️ Input · ⬆️ Output

    • ✨clean clothes
    • 👕dirty clothes
    • 🔌electrical energy
    • 🌡️waste heat
    • 🔊noise
    • 🧴laundry soap
    • 🪣used soapy water
    • 🚿fresh water
    Show answer

    ⬇️ Input: dirty clothes, electrical energy, laundry soap, fresh water · ⬆️ Output: clean clothes, waste heat, noise, used soapy water

    Hint: Inputs go into the system. Outputs come out of it.

Answer key

  1. 1. sugar completely dissolved in water (Mixtures, Solutions & WHMIS)
  2. 2. They move faster. (Particles & Matter)
  3. 3. the colour of the liquid (Viscosity & Flow)
  4. 4. gas (Density & Buoyancy)
  5. 5. 20 Pa (Pressure & Pascal's Law)
  6. 6. It pushes fluid through a network of tubes. (Hydraulics & Pneumatics)
  7. 7. energy, carbon dioxide and water (Cells & Life Processes)
  8. 8. organ (Cells, Organisms & Technology)
  9. 9. Cell → Organ → Organ system → Organism (Cells, Tissues & Organs)
  10. 10. ⬇️ Input: dirty clothes, electrical energy, laundry soap, fresh water · ⬆️ Output: clean clothes, waste heat, noise, used soapy water (Systems in Action)

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