PHS KS3 8I - Fluids

  When liquid water changes into steam it is:

•   evaporating.
•  condensing.
•   melting.
•  dissolving.

  What happens to the temperature of the water in a beaker when it is boiling?

•   It goes up.
•  It stays the same.
•  It goes down.
•  It all depends on how hot the water was to start with.

  In what way is ice different to other solid materials?

•  It is colder.
•  It occurs naturally.
•  Ice (solid water) is less dense than liquid water. 
•   The density of ice does not change when it is cooled down.

  Jo heats a beaker of water and draws a graph to show how its temperature changes. Which sentence explains the shape of the graph at point X?

•   The particles in the solid are breaking apart and releasing energy.
•   The liquid is giving out the energy needed to break the bonds between particles.
• The energy is breaking the bonds between the particles in the gas instead of making the gas hotter.
•   The energy is breaking the bonds between the particles in the liquid instead of making the liquid hotter.

 The pressure in liquids and gases is caused by:

•  the particles pressing down.
• the particles pushing up.
•  the particles moving sideways.
•  the particles moving in all directions and colliding with things.

  When a gas is compressed:

•  the particles bump into the walls of the container less often.
•  the pressure drops.
•  the particles become more spread out.
•  the pressure increases.

  Why does a submarine need to be stronger than a ship of the same size?

•   Water pressure is greater near the surface of the water.
•   There is more water pressure at the bottom of the sea.
•   Submarines carry more cargo than ships.
• Water pressure decreases with depth

  Which of these forces is the upthrust?

• A
• B
• C
• D

  How can you work out whether or not an object will float in water?

•   Find its weight.
•   Find its mass.
•   Compare its volume with the volume of water.
•   Compare its density with the density of water.

  The air resistance of a car can be reduced by:

•   making the car bigger.
•  giving it a streamlined shape.
•   making the car heavier.
•  putting a roof box on it.