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

brass contracts more than invar.

brass expands when it cools down.

invar and brass contract by equal amounts.

invar contracts more than brass.

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

increases the average speed of the water molecules

increases the average separation of the water molecules

raises the temperature of the air near the water

splits the water molecules into their separate atoms

What is the definition of heat capacity?

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

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

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

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

Fillings in teeth should be made from a material which

expands by the same amount as the tooth when heated.

expands more than the tooth when heated.

expands less than the tooth when heated.

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?

to allow for expansion of the rail sections during hot weather

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

to allow rain water to drain from the rail sections

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

When ice melts to become water, which force must be overcome?

the attraction between electrons and the nucleus

the attraction between the atoms in a molecule

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?

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

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

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

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

What happens when a metal bar is heated?

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

The molecules get larger, making the bar longer

The molecules vibrate more quickly, making the bar denser.

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

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?

The piston remains in the same place.

The speed of the molecules decreases.

Thermal Properties Of Matter

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| By MOHAMAD ZAMRI

MOHAMAD ZAMRI

Community Contributor

Quizzes Created: 11 | Total Attempts: 14,988

Questions: 18 | Attempts: 1,709 | Updated: Mar 22, 2023

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Questions and Answers

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
Correct Answer
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 °C. Therefore, the temperature that corresponds to 0 °C on the graph would be point C.

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1
0
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.
Correct Answer
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
Correct Answer
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
Correct Answer
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
Correct Answer
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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1
0
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.
Correct Answer
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.

The graph shows the cooling curve of a hot substance.
- A.
  
  B
- B.
  
  A
- C.
  
  C
- D.
  
  D
Correct Answer
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
Correct Answer
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
Correct Answer
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.

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
Correct Answer
B. B

Explanation
The average electrical power used can be calculated using the formula: Power = Energy / Time. In this case, the energy can be calculated by multiplying the specific latent heat of steam (2250 J/g) by the mass of water (100 g), which gives us 225,000 J. The time is given as 300 seconds. Therefore, the average electrical power used is 225,000 J / 300 s = 750 W.

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11.

Thermal Properties Of Matter

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?

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

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 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?

What is the definition of heat capacity?

Fillings in teeth should be made from a material which

The graph shows the cooling curve of a hot substance.

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

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?

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?

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?