Transfer Of Thermal Energy - Conduction
Online Quiz - Transfer of Thermal Energy & Conduction
- 1.
When you put your hand in a cup of ice water, your hand feels cold. This is because ___________.
- A.
Your hand gains the coldness from the ice water
- B.
Your hand loses thermal energy to the ice water
- C.
The ice water loses thermal energy to your hand
- D.
The ice water loses the coldness to your hand
Correct Answer
B. Your hand loses thermal energy to the ice waterExplanation
Thermal energy always flows from a region of higher temperature to a region of lower temperature.Rate this question:
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- 2.
Which of the following is the poorest conductor of thermal energy?
- A.
Vacuum
- B.
Air
- C.
Water
- D.
Wool
Correct Answer
B. AirExplanation
Vacuum cannot conduct thermal energy at all. Ranking of thermal conductivity in ascending order: air, wool, waterRate this question:
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- 3.
When you stand in bare feet with one foot on a stone floor and the other on a carpet, the stone floor feels colder than the carpet. The most likely explanation is that ________________.
- A.
Air is unable to circulate through the carpet fibres
- B.
More energy flows from the carpet to your foot than from the stone floor to your foot
- C.
More energy flows from your foot to the stone floor than to the carpet
- D.
the stone floor is at a lower temperature than the carpet
Correct Answer
C. More energy flows from your foot to the stone floor than to the carpetExplanation
More thermal energy from your feet is lost to the stone floor than the carpet.Rate this question:
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- 4.
When one end of a rod is heated, thermal energy is transferred down the rod by _________ .
- A.
Hot molecules moving along the rod
- B.
Hot molecules changing places with the cooler ones
- C.
The air around the rod moves after being heated
- D.
The transfer of kinetic energy from one molecule to the next
Correct Answer
D. The transfer of kinetic energy from one molecule to the nextExplanation
Conduction is the process of thermal energy transfer without any flow of the material medium. Thermal energy is transferred through the collisions with neighbouring particles and free electron diffusion.Rate this question:
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- 5.
An unlit match is held near to an extremely hot Bunsen flame as shown in the figure. The match does not get hot enough to light because _________.
- A.
A match can only be lit by striking it on a rough surface
- B.
The flame is not hot enough
- C.
Air is a bad conductor of thermal energy
- D.
The flame does not radiate any thermal energy sideways
Correct Answer
C. Air is a bad conductor of thermal energyExplanation
Thermal energy cannot be conducted easily to the unlit match to light it up.Rate this question:
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- 6.
An experiment is carried as shown in the diagram. Why does the ice take a long time to melt, even though the water at the top of the tube is boiling?
- A.
Water is a poor conductor of thermal energy.
- B.
The gauze prevents the thermal energy from reaching the ice.
- C.
Ice is a poor conductor of thermal energy.
- D.
The test tube conducts the thermal energy away from the ice.
Correct Answer
A. Water is a poor conductor of thermal energy.Explanation
Thermal energy is difficult to be conducted to the ice to melt it since water is a bad conductor of thermal energy.Rate this question:
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- 7.
A plastic ruler feels warmer than a metal ruler because ___________.
- A.
The metal ruler conducts thermal energy away from your hand faster
- B.
The molecules in the metal ruler are less energetic
- C.
The metal ruler has a shinier surface
- D.
The metal ruler is a worse radiator of thermal energy
Correct Answer
A. The metal ruler conducts thermal energy away from your hand fasterExplanation
The correct answer is that the metal ruler conducts thermal energy away from your hand faster. This is because metals are good conductors of heat, meaning they can transfer thermal energy more efficiently than other materials. When you touch a metal ruler, it quickly absorbs the heat from your hand and conducts it away, making the ruler feel colder. In contrast, a plastic ruler is a poor conductor of heat, so it does not transfer thermal energy away from your hand as quickly, making it feel warmer.Rate this question:
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- 8.
When we heat a beaker on a tripod, a gauze is usually placed on the tripod. This is because the gauze ___________.
- A.
Spreads the thermal energy evenly over the base of the beaker
- B.
Increases the rate of heating by becoming red hot itself
- C.
Increases the rate of heating by conducting the heat faster
- D.
Concentrates the thermal energy at one part of the base of the beaker
Correct Answer
A. Spreads the thermal energy evenly over the base of the beakerExplanation
The gauze is made of metal and will conduct thermal energy evenly over the base of the beaker. This will ensure even heating of the liquid in the beaker.Rate this question:
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- 9.
Thermal conduction in metals differs from thermal conduction in insulators. The reason for this is that, in metals, thermal energy can be transferred by _________.
- A.
Positive ions
- B.
Free electrons
- C.
Infra-red rays
- D.
Molecular vibrations
Correct Answer
B. Free electronsExplanation
In metals, thermal energy can be transferred by free electrons. Unlike insulators, metals have a large number of free electrons that are not tightly bound to atoms. These free electrons can easily move through the metal lattice, carrying thermal energy with them. This is why metals are good conductors of heat. On the other hand, insulators do not have a significant number of free electrons, so thermal energy is primarily transferred through molecular vibrations.Rate this question:
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- 10.
A hot object warms a cool object. Which of the following statements about the relationship between temperature and thermal energy in this case is correct?
- A.
Temperature flows from the hot object to the cold object.
- B.
Temperature flows from the object with the most thermal energy to the object with the least thermal energy.
- C.
The object with the most thermal energy always has the highest temperature.
- D.
Energy flows from the object with the highest temperature to the object with the lowest temperature.
Correct Answer
D. Energy flows from the object with the highest temperature to the object with the lowest temperature.Explanation
Only energy can be transferred from one body to another. The amount of the thermal energy depends on the mass of the object too.Rate this question:
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Current Version
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Mar 21, 2023Quiz Edited by
ProProfs Editorial Team -
Jun 22, 2009Quiz Created by
Yapshinn