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- @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
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- @Which of these expands the most when heated?
- Gas
- Solid
- Liquid
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- @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
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- @Which of these expands the least when heated?
- Solids
- Liquids
- Gases
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- @Which of these is in the correct order of increasing expansion rates?
- Solids, Liquids & Gases
- Liquids, Gases & Solids
- Gases, Solids & Liquids
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- @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
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- @A thermometer works because liquids:
- Expand when they are heated
- Change to a gas when heated
- Turn to a solid when heated
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- @Which one of the following (if they are all exactly the same size) expands the most when heated?
- Copper
- Brass
- Invar
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- @A 360W TV is plugged into the mains (240V). What value of fuse should be used in the plug?
- 3A
- 1A
- 13A
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- @Liquids expand when heated:
- More than solids
- More than gases
- The same as solids
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- @What kinds of particles are mainly emitted by a hot metal filament?
- Electrons
- Metal ions
- Protons
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- @Gases expand when heated:
- More than solids or liquids
- Same as solids or liquids
- Less than solids or liquids
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- @The opposite of expansion is:
- Contraction
- Grow bigger
- Cooling
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- @When heated, a bimetallic strip:
- May bend
- melts and cuts off the circuit
- Cools down
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- @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
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- @In winter, frozen water pipes may burst because:
- Ice expands when formed
- Ice is cold
- Water expands when cooled
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- @Which of the following pieces of apparatus show that metals expand when heated?
- Ball and ring
- Ball and rod
- Ring and rod
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- @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
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- @When a solid substance is heated its molecules:
- Vibrate a little faster
- Expand
- Always break away from their neighbours
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- @Which of the following energy changes involves friction?
- Kinetic to heat energy
- Heat to sound energy
- Potential to heat energy
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