Gradelings

Grade 8 Science practice sheet

Nova Scotia Curriculum · from Gradelings · Name: ______________________

  1. Question 1

    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.

  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

    Which describes climate rather than weather?

    • Tomorrow's forecast of rain
    • The average temperature in Halifax over 30 years
    • Today's fog in Halifax
    Show answer

    The average temperature in Halifax over 30 years

    Hint: Weather is what happens on a given day. Climate is the pattern over many years.

  8. Question 8

    Changing how we live to cope with the effects of climate change is called…

    • adaptation
    • mitigation
    • combustion
    Show answer

    adaptation

    Hint: To adapt means to adjust to new conditions.

  9. Question 9

    Which organelle releases energy from food for the cell?

    • chloroplast
    • cell membrane
    • mitochondria
    • nucleus
    Show answer

    mitochondria

    Hint: Mitochondria carry out cellular respiration, releasing usable energy.

  10. Question 10

    Which is a physical change?

    • Milk turning sour
    • Wood burning
    • Ice melting
    • Iron rusting
    Show answer

    Ice melting

    Hint: In a physical change, no new substance forms.

Answer key

  1. 1. energy, carbon dioxide and water (Cells & Life Processes)
  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. The average temperature in Halifax over 30 years (Evidence of Climate Change)
  8. 8. adaptation (Climate Change: Causes & Action)
  9. 9. mitochondria (Cells & Life Processes)
  10. 10. Ice melting (Particles & Matter)

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