# Thermal Properties Of Matter

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Quizzes Created: 11 | Total Attempts: 13,745
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• 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

C. C
Explanation
Based on the information given, the ice cubes were taken from a deep-freeze, which means they were at a temperature of 0 Â°C. Therefore, the temperature that corresponds to 0 Â°C on the graph would be point C.

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• 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.

A. Brass contracts more than invar.
Explanation
When the bimetallic strip is cooled, both the brass and invar contract. However, brass contracts more than invar. This difference in contraction causes the bimetallic strip to bend or change shape.

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• 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

A. Increases the average speed of the water molecules
Explanation
The energy required to change liquid water into water vapor, known as latent heat of vaporization, increases the average speed of the water molecules. This energy is used to overcome the intermolecular forces holding the water molecules together, allowing them to break free and move more rapidly as vapor.

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• 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

A. 3 000 000 J / kg
Explanation
When the kettle is placed on the balance and the water inside continues to boil, the balance reading changes by 0.2 kg. This change in mass is due to the water vaporizing into steam. The specific latent heat of vaporization is the amount of energy required to convert 1 kg of a substance from liquid to gas at a constant temperature and pressure. In this case, the change in mass is 0.2 kg, and the kettle has a power of 2 kW. Given that the boiling process takes 5 minutes, we can calculate the energy transferred using the formula: Energy = Power x Time. Therefore, the specific latent heat of vaporization of water is 3,000,000 J/kg.

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• 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

A. The quantity of heat required to raise the temperature of an object through 1 K
Explanation
Heat capacity is defined as the quantity of heat required to raise the temperature of an object through 1 K. This means that it measures the amount of heat energy needed to increase the temperature of an object by 1 degree Kelvin. It is a property that depends on the mass and material of the object, and it is commonly used to describe the ability of a substance or object to store and transfer heat.

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• 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.

A. Expands by the same amount as the tooth when heated.
Explanation
When a tooth is heated, it expands. Therefore, it is important for fillings in teeth to be made from a material that also expands by the same amount as the tooth when heated. If the filling material expands more than the tooth, it could cause pressure and damage to the tooth. If it expands less than the tooth, there may be gaps between the filling and the tooth, allowing bacteria to enter and cause decay. If the filling material does not expand at all when heated, it may not fit properly in the tooth and could become loose or fall out.

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• 7.

• A.

B

• B.

A

• C.

C

• D.

D

A. B
• 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

D. D
Explanation
When the temperature rises, the gas inside the alarm expands. This causes the mercury pellet to move and complete the circuit, triggering the alarm.

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• 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

A. To allow for expansion of the rail sections during hot weather
Explanation
The reason for the gap between the rail sections is to allow for expansion of the rail sections during hot weather. When the temperature rises, the metal rails expand, and if there were no gaps, the rails would buckle or warp. By providing gaps between the rail sections, the rails can expand without causing any damage or obstruction to the train's movement.

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• 10.

• A.

A

• B.

B

• C.

C

• D.

D