@Why does a bimetallic strip bend when it is heated?
Because one side of it expands more quickly than the other
Because it is made of metal
Because it is very thin

@Which of these expands the most when heated?
Gas
Solid
Liquid

@A householder connects a 2kW fan heater to the mains using thin wire. Why is this dangerous?
The large current heats the wire
The fan heater may overheat
Heat from the fire may melt the insulation on the wire

@Which of these expands the least when heated?
Solids
Liquids
Gases

@Which of these is in the correct order of increasing expansion rates?
Solids, Liquids & Gases
Liquids, Gases & Solids
Gases, Solids & Liquids

@If boiling water is poured onto a frozen windscreen in winter it shatters. This is because:
The glass expands very rapidly
The glass contracts quickly
The ice melts, turning into steam

@A thermometer works because liquids:
Expand when they are heated
Change to a gas when heated
Turn to a solid when heated

@Which one of the following (if they are all exactly the same size) expands the most when heated?
Copper
Brass
Invar

@A 360W TV is plugged into the mains (240V). What value of fuse should be used in the plug?
3A
1A
13A

@Liquids expand when heated:
More than solids
More than gases
The same as solids

@What kinds of particles are mainly emitted by a hot metal filament?
Electrons
Metal ions
Protons

@Gases expand when heated:
More than solids or liquids
Same as solids or liquids
Less than solids or liquids

@The opposite of expansion is:
Contraction
Grow bigger
Cooling

@When heated, a bimetallic strip:
May bend
melts and cuts off the circuit
Cools down

@A balloon is blown up and then left in a freezer. After a while it has:
Shrunk, but not burst
Not changed
Burst because it expands

@In winter, frozen water pipes may burst because:
Ice expands when formed
Ice is cold
Water expands when cooled

@Which of the following pieces of apparatus show that metals expand when heated?
Ball and ring
Ball and rod
Ring and rod

@Bridges are sometimes built with one end on a roller because:
Hot weather makes them expand
Strong winds cause them to move
They do not have to be made so accurately

@When a solid substance is heated its molecules:
Vibrate a little faster
Expand
Always break away from their neighbours

@Which of the following energy changes involves friction?
Kinetic to heat energy
Heat to sound energy
Potential to heat energy
 