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Physics: Senior High School: 11th and 12th Grade Quiz - Energy - Transfer of Energy (Questions)

This Physics quiz is called 'Energy - Transfer of Energy' and it has been written by teachers to help you if you are studying the subject at senior high school. Playing educational quizzes is one of the most efficienct ways to learn if you are in the 11th or 12th grade - aged 16 to 18.

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Different forms of energy can be transformed from one form to another. Energy transfers play a major part in everyday life, for example every time we put the kettle on an energy transfer takes place. It is an essential part of a senior high school physics syllabus that you are able to understand what energy transfers take place in certain situations and how those transfers occur.

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As well as conduction, convection and radiation, evaporation and condensation transfer heat energy from place to place. Evaporation takes place from the surface of a liquid. The particles in liquids are in constant motion, changing places and colliding with one-another. The kinetic theory predicts that the energy of majority of particles will lie within certain limits but there will always be some with higher than average and lower than average energies (higher tier candidates may have seen a diagram showing this).

When they are near the surface of a liquid, particles with higher than average energies can overcome the forces holding the particles together as a liquid and pass into the air. As this happens, the number of particles in the liquid becomes smaller so the liquid volume gradually decreases. The total energy contained within the liquid is decreased and therefore the temperature of the liquid drops. Some liquids naturally evaporate faster than others, for example, ethanol will evaporate faster than water. Evaporation is a heat transfer process that transfers the thermal energy into the surroundings from a liquid. The faster that a liquid evaporates, the cooler it will become. There are several factors that affect the rate of evaporation of a liquid other than the type of liquid - you need to revise them for the exam.

The opposite of evaporation is condensation. This is the process where vapor turns back into a liquid. A vapor is made from billions of particles, if they are slowed down, they will whizz around less, become closer together and the forces they exert on each other will increase. In other words, the vapor becomes a liquid during condensation. To slow down the speed of movement of particles, it is necessary to remove heat energy, this occurs where a vapor meets a cold surface or is mixed with cooler vapor (for example when you breathe out on a cold day the water vapor in your breath condenses as it loses its energy to the cold air around you). Condensation therefore transfers thermal energy from a vapor into the surroundings. In senior high school, you need to know the factors that affect the amount of condensation that occurs.

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1. Which of the following statements best describes our understanding of how conduction of heat occurs?
[ ] Vibrating atoms interact with neighbor atoms transferring kinetic energy
[ ] Vaporization of a liquid occurring on the surface of the liquid
[ ] The particles heat independently of one another
[ ] The hot particles rise whilst the cooler particles fall towards the heat source
2. Which material is best at conducting heat?
[ ] Polystyrene
[ ] Brass
[ ] Air
[ ] A t-shirt
3. How does convection occur?
[ ] By condensing a gas
[ ] Vaporization occurring on the surface of the liquid
[ ] Particles moving independently of one another
[ ] By heating a fluid
4. What factors affect the amount of condensation that occurs?
[ ] The temperature of the surface on which the condensate forms
[ ] The concentration of liquid vapor in the atmosphere
[ ] The surface area of the surface on which condensate forms
[ ] All of the above
5. Which of the following best explains evaporation?
[ ] Rapid moving/vibrating atoms interact with neighbor atoms transferring kinetic energy
[ ] High energy particles break free of the liquid at the surface
[ ] The particles heat independently of one another
[ ] High energy particles break free from the liquid throughout the whole container
6. What effect causes energy to be transferred at a faster rate between an object and its surroundings?
[ ] A smaller temperature difference
[ ] A larger temperature difference
[ ] A smaller surface area of the object
[ ] An atmosphere measuring 0oC
7. What is condensation?
[ ] The transfer of energy between two particles in a solid structure
[ ] Vaporization of a liquid occurring on the surface of the liquid
[ ] A change in state of matter from a gas to a liquid
[ ] It is a small town outside Manchester
8. Which material would be best to use as an insulator against heat loss?
[ ] Brass
[ ] Aluminium
[ ] Expanded polystyrene
[ ] Iron
9. What factors affect evaporation?
[ ] Temperature
[ ] Air movement
[ ] Surface area of liquid
[ ] All of the above
10. What does the rate at which an object transfers energy by heat depend on?
[ ] Surface area and volume
[ ] Material of the object
[ ] The nature of the surface with which the object is in contact
[ ] All of the above
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Physics: Senior High School: 11th and 12th Grade Quiz - Energy - Transfer of Energy (Answers)
1. Which of the following statements best describes our understanding of how conduction of heat occurs?
[x] Vibrating atoms interact with neighbor atoms transferring kinetic energy
[ ] Vaporization of a liquid occurring on the surface of the liquid
[ ] The particles heat independently of one another
[ ] The hot particles rise whilst the cooler particles fall towards the heat source
In a solid, the particles can only vibrate. In substances that conduct heat, the vibrations are passed from one particle to the next
2. Which material is best at conducting heat?
[ ] Polystyrene
[x] Brass
[ ] Air
[ ] A t-shirt
All metals are good conductors of heat and electricity. The free electrons and tightly packed structure of all metals aid the conduction of heat throughout the material
3. How does convection occur?
[ ] By condensing a gas
[ ] Vaporization occurring on the surface of the liquid
[ ] Particles moving independently of one another
[x] By heating a fluid
Where the fluid (remember a fluid can be either a liquid or a gas) is heated, the thermal energy increases the movement of particles, so the particles in the heated portion are further apart. Because there are fewer particles now in the same volume, the heated part of the fluid is less dense and rises to float on the more dense part. As the heated area cools, the density increases and it begins to sink again
4. What factors affect the amount of condensation that occurs?
[ ] The temperature of the surface on which the condensate forms
[ ] The concentration of liquid vapor in the atmosphere
[ ] The surface area of the surface on which condensate forms
[x] All of the above
The colder the surface is, the more quickly the hot vaporized liquid particles cool and return to liquid form on the surface. A larger concentration of liquid vapor in the atmosphere increases the number of interactions between the liquid in the atmosphere and the surface. Again, having a surface with a larger surface area also increases the number of interactions between the surface and the liquid
5. Which of the following best explains evaporation?
[ ] Rapid moving/vibrating atoms interact with neighbor atoms transferring kinetic energy
[x] High energy particles break free of the liquid at the surface
[ ] The particles heat independently of one another
[ ] High energy particles break free from the liquid throughout the whole container
There is less overall energy left in the liquid which you can detect as a temperature drop
6. What effect causes energy to be transferred at a faster rate between an object and its surroundings?
[ ] A smaller temperature difference
[x] A larger temperature difference
[ ] A smaller surface area of the object
[ ] An atmosphere measuring 0oC
As a hot object cools down, the rate of cooling decreases as the temperature gets closer to the temperature of the surroundings. That is why you get a 'cooling curve' and not a 'cooling straight line' when you plot a graph of temperature vs time for cooling something down
7. What is condensation?
[ ] The transfer of energy between two particles in a solid structure
[ ] Vaporization of a liquid occurring on the surface of the liquid
[x] A change in state of matter from a gas to a liquid
[ ] It is a small town outside Manchester
Energy is transferred from higher energy particles to the surface on which condensation is happening
8. Which material would be best to use as an insulator against heat loss?
[ ] Brass
[ ] Aluminium
[x] Expanded polystyrene
[ ] Iron
Expanded polystyrene contains a lot of inert gas trapped in its structure making it a good insulator because gasses are poor conductors of heat
9. What factors affect evaporation?
[ ] Temperature
[ ] Air movement
[ ] Surface area of liquid
[x] All of the above
Clothes dry better on warm windy days when they are spread out as much as possible
10. What does the rate at which an object transfers energy by heat depend on?
[ ] Surface area and volume
[ ] Material of the object
[ ] The nature of the surface with which the object is in contact
[x] All of the above
Knowing how heat energy is transferred from one place to another is useful for heating and insulating our homes