# Thermal Properties Of Matter

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• 1.
1. Some ice cubes are taken from a deep-freeze and placed in a metal container. The container is heated at a constant rate and readings of temperature and time are taken. The results are recorded on a graph.
Which temperature corresponds to 0 °C?
• A.

A

• B.

B

• C.

C

• D.

D

• 2.
The diagrams show a bimetallic strip when it is at room temperature and after ithas been cooled.                              The change in shape occurs because
• A.

Brass contracts more than invar.

• B.

Brass expands when it cools down.

• C.

Invar and brass contract by equal amounts.

• D.

Invar contracts more than brass.

• 3.
The energy required to change liquid water into water vapour at the sametemperature is called latent heat of vaporisation.What does this energy do?
• A.

Increases the average speed of the water molecules

• B.

Increases the average separation of the water molecules

• C.

Raises the temperature of the air near the water

• D.

Splits the water molecules into their separate atoms

• 4.
A 2 kW kettle containing boiling water is placed on a balance. It is left there andcontinues to boil for 5 minutes. The balance reading changes by 0.2 kg.What does this information give as a value for the specific latent heat ofvaporisation of water?
• A.

3 000 000 J / kg

• B.

50 000 J / kg

• C.

3000 J / kg

• D.

2000 J / kg

• 5.
What is the definition of heat capacity?
• A.

The quantity of heat required to raise the temperature of an object through 1 K

• B.

The quantity of heat required to raise the temperature of 1 kg of a substance through 1 K

• C.

The quantity of heat required to convert an object from solid to liquid without a change in temperature

• D.

The quantity of heat required to change 1 kg of a substance from solid to liquid without a change in temperature

• 6.
Fillings in teeth should be made from a material which
• A.

Expands by the same amount as the tooth when heated.

• B.

Expands more than the tooth when heated.

• C.

Expands less than the tooth when heated.

• D.

Does not expand when heated.

• 7.
The graph shows the cooling curve of a hot substance.
• A.

B

• B.

A

• C.

C

• D.

D

• 8.
The diagram shows the design for an alarm.The mercury pellet moves and completes the circuit.Why does this happen? temperaturegasAfallscontractsBfallsexpandsCrisescontractsDrisesexpands
• A.

A

• B.

B

• C.

C

• D.

D

• 9.
At regular intervals along a railway line there is a gap between the rail sections.What is the reason for the gap between the rail sections?
• A.

To allow for expansion of the rail sections during hot weather

• B.

To allow for vibrations of the rail sections as the train passes over them

• C.

To allow rain water to drain from the rail sections

• D.

To keep the wheels of the train and carriages on the rail sections

• 10.
Using an electric kettle, 100 g of water at 100 °C is converted into steam at100 °C in 300 seconds. The specific latent heat of steam is 2250 J / g. What is the average electrical power used?
• A.

A

• B.

B

• C.

C

• D.

D

• 11.
The table shows the increase in length of four metals when heated through the  same temperature rise. Each metal initially has the same length.A bimetallic strip is made from two of the metals. When heated, it bends in the   direction shown.
• A.

A

• B.

B

• C.

C

• D.

D

• 12.
When ice melts to become water, which force must be overcome?
• A.

The attraction between electrons and the nucleus

• B.

The attraction between the atoms in a molecule

• C.

The force between molecules

• D.

The force of gravity

• 13.
A substance that is originally a solid is heated strongly for some time. At one stage, the energy given to the substance is used as latent heat ofvaporisation.At this stage, what change does the energy cause?
• A.

It breaks the bonds holding the molecules together. Molecules escape from the liquid.

• B.

It breaks the bonds holding the molecules together. The solid becomes liquid.

• C.

It makes the molecules move faster but there is still a strong attraction between them.

• D.

It makes the molecules move faster and so the temperature rises.

• 14.
What happens when a metal bar is heated?
• A.

The distance between the molecules increases, making the bar longer.

• B.

The molecules get larger, making the bar longer

• C.

The molecules vibrate more quickly, making the bar denser.

• D.

The speed of the molecules increases, making the bar thinner.

• 15.
A block of metal has a mass of 2.0 kg. Its specific heat capacity is 800 J / (kg oC).The block is supplied with 2400 J of energy. What is the rise in temperature?
• A.

0.17 oC

• B.

0.67 oC

• C.

1.5 oC

• D.

6.0 oC

• 16.
A quantity of gas is trapped in a container by a piston exerting a force F.The temperature of the gas is raised while F remains unchanged.Which statement is correct?
• A.

The gas expands.

• B.

The molecules get larger.

• C.

The piston remains in the same place.

• D.

The speed of the molecules decreases.

• 17.
An ice-cube has a mass of 7.50 g. The ice-cube is at 0 oC.Heat from the surroundings reaches the ice-cube at an average rate of 1.25 J / s.How long does it take for all of the ice to melt?                              (specific latent heat of fusion of ice = 333 J / g)
• A.

2000 s

• B.

35.5 s

• C.

55.5 s

• D.

3120 s

• 18.