Grade 8 Science practice sheet

Question 1

What are the products of cellular respiration?

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

Question 2

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

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

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

Question 4

Which state of matter usually has the lowest density?

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

Question 5

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

answer boxPa

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.

Question 7

Which organelle releases energy from food for the cell?

• chloroplast
• cell membrane
• mitochondria
• nucleus

Question 8

Which is a physical change?

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

Question 9

Why does paint get thinner and easier to spread when a little thinner is added?

• It becomes a solid.
• Its viscosity increases.
• Its viscosity decreases.
• Its density becomes zero.

Question 10

Ice floats in liquid water. What does this tell you?

• Ice is less dense than liquid water.
• Ice has more mass than the same volume of water.
• Ice is a gas.
• Water particles do not move.