Heat Conduction And Convection
Questions and Answers
- 1.
How is air heated in our atmosphere
- A.
Radiation
- B.
Conduction
- C.
Convection
Correct Answer
B. ConductionExplanation
Air is heated in our atmosphere through conduction. Conduction is the process of heat transfer through direct contact between particles or objects. In the atmosphere, air molecules near the Earth's surface are heated by direct contact with the warm ground. These molecules gain energy and become more energetic, causing them to move faster and collide with other air molecules, transferring heat in the process. This process continues, leading to the heating of the surrounding air and the overall increase in temperature in the atmosphere.Rate this question:
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- 2.
True or False higher temperature means faster moving molecules
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Higher temperature means that the average kinetic energy of the molecules in a substance is higher. This increased kinetic energy leads to faster movement of the molecules. Therefore, it is true that higher temperature corresponds to faster moving molecules.Rate this question:
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- 3.
The reason why water boils causing the circular motion is due to?
- A.
Radiation
- B.
Conduction
- C.
Convection
Correct Answer
C. ConvectionExplanation
Water boils causing a circular motion due to convection. Convection is the transfer of heat energy through the movement of fluids. When water is heated, the molecules gain energy and move faster, causing them to spread apart and become less dense. The less dense hot water rises to the top, while the denser cold water sinks to the bottom. This creates a circular motion as the hot water rises and the cold water sinks, resulting in the boiling of water.Rate this question:
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- 4.
When a metal spoon with a temperature of 20oC is placed into a cup of water with a temperature of 90oC the spoon will heat up. This is an example of:
- A.
Radiation
- B.
Conduction
- C.
Convection
Correct Answer
B. ConductionExplanation
When a metal spoon is placed into a cup of hot water, heat is transferred from the water to the spoon through direct contact. This process is known as conduction. The particles in the hot water collide with the particles in the spoon, transferring their kinetic energy and causing the spoon to heat up. Unlike radiation and convection, which involve heat transfer through electromagnetic waves or the movement of fluids, conduction occurs through direct physical contact between objects.Rate this question:
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- 5.
this type of heat transfer occurs when heat moves from one molecule to another.
- A.
Radiation
- B.
Conduction
- C.
Convection
Correct Answer
B. ConductionExplanation
Conduction is the correct answer because it refers to the type of heat transfer that occurs when heat moves from one molecule to another. In conduction, heat is transferred through direct contact between molecules or objects. It does not involve the movement of fluid or electromagnetic waves, which are characteristic of convection and radiation, respectively.Rate this question:
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- 6.
The transfer of heat between substances that are in direct contact with each other is called what?
- A.
Radiation
- B.
Convection
- C.
Conduction
- D.
Heat Transfer
Correct Answer
C. ConductionExplanation
Conduction is the transfer of heat between substances that are in direct contact with each other. It occurs through direct molecular collision, where the heat energy is transferred from the higher temperature substance to the lower temperature substance. This process does not involve the movement of the substances themselves, but rather the transfer of energy between their molecules.Rate this question:
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- 7.
The air in the hot air balloon is heated and circulates. This is an example of ...
- A.
Conduction
- B.
Convection
- C.
Radiation
Correct Answer
B. ConvectionExplanation
The air in the hot air balloon is heated, which causes it to become less dense and rise. As the hot air rises, cooler air from the surrounding environment moves in to take its place. This movement of air is known as convection. Therefore, the example of the air in the hot air balloon being heated and circulating is an example of convection.Rate this question:
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- 8.
You walk barefoot on the hot street and it burns your toes. This is an example of...
- A.
Conduction
- B.
Convection
- C.
Radiation
Correct Answer
A. ConductionExplanation
Conduction is the transfer of heat through direct contact between two objects or substances. In this scenario, the heat from the hot street is transferred to your toes through direct contact, causing them to burn. Therefore, the example given is an illustration of conduction.Rate this question:
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- 9.
The transfer of energy in fluids or gases
- A.
Conduction
- B.
Convection
- C.
Radiation
Correct Answer
B. ConvectionExplanation
Convection is the transfer of energy in fluids or gases through the movement of the particles themselves. When a fluid or gas is heated, the particles gain energy and move faster, becoming less dense and rising. As they rise, they carry the heat energy with them. Conversely, when a fluid or gas is cooled, the particles lose energy, become more dense, and sink. This creates a cycle of rising and sinking, allowing for the transfer of heat energy. Therefore, convection is the correct answer as it describes the transfer of energy in fluids or gases.Rate this question:
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- 10.
What is the units for temperature?
- A.
Metres.
- B.
Centimetre-cube.
- C.
Degree Celsius.
- D.
Degree.
Correct Answer
C. Degree Celsius.Explanation
The correct answer is Degree Celsius. Degree Celsius is the standard unit for measuring temperature in the metric system. It is used to measure the temperature of substances and is widely recognized and used globally. The other options, such as meters, centimeter-cube, and degree, are units of measurement for length or angles and are not appropriate for measuring temperature.Rate this question:
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- 11.
What is heat transfer?
- A.
Radiation
- B.
Convection
- C.
Conduction
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
Heat transfer is the process of energy transfer from one object or substance to another due to a difference in temperature. It can occur through three different mechanisms: radiation, convection, and conduction. Radiation is the transfer of heat through electromagnetic waves, while convection is the transfer of heat through the movement of fluids or gases. Conduction, on the other hand, is the transfer of heat through direct contact between objects. Therefore, all of the above options are correct as they represent different ways in which heat can be transferred.Rate this question:
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- 12.
What is heat?
- A.
Weather
- B.
Warmed up molecules
- C.
A washer\dryer setting
Correct Answer
B. Warmed up moleculesExplanation
Heat is the transfer of thermal energy from one object or substance to another. When molecules are heated up, they gain kinetic energy and move faster, causing an increase in temperature. This increase in molecular movement is what we perceive as heat. Therefore, the answer "warmed up molecules" accurately describes the concept of heat.Rate this question:
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- 13.
Which one is a form of heat trasnfer.
- A.
Conduction
- B.
Absorbstion
- C.
Refraction
- D.
Reflection
Correct Answer
A. ConductionExplanation
Conduction is a form of heat transfer where heat is transferred through direct contact between particles or objects. In this process, heat energy is transferred from the hotter object to the colder object, causing the particles to vibrate and transfer their energy to neighboring particles. This transfer continues until equilibrium is reached and both objects have the same temperature. Conduction is a common form of heat transfer in solids, as the particles are closely packed together, allowing for efficient transfer of heat energy. Absorption, refraction, and reflection are not forms of heat transfer, but rather processes related to the interaction of light with different materials.Rate this question:
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- 14.
A substance that doesn't conduct heat well is called an
Correct Answer
insulatorExplanation
An insulator is a substance that does not conduct heat well. This means that it has low thermal conductivity, which prevents the transfer of heat through it. Insulators are commonly used to prevent heat loss or gain in various applications, such as in building insulation or in the design of thermal barriers. They are also used to protect against electrical shocks, as insulators have high electrical resistance. Overall, the term "insulator" accurately describes a substance that restricts the flow of heat.Rate this question:
- 15.
1. Heat energy is called what kind of energy?
- A.
Solar Energy
- B.
Thermal Energy
- C.
Nuclear Energy
Correct Answer
B. Thermal EnergyExplanation
Heat energy is referred to as thermal energy because it is the energy that is associated with the motion of particles within a substance. When particles move faster, they have more kinetic energy, which results in an increase in temperature. Thermal energy can be transferred from one object to another through conduction, convection, or radiation. In this case, the correct answer is "Thermal Energy" as it accurately describes the type of energy that is associated with heat.Rate this question:
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- 16.
Energy cannot be created or destroyed, but it can be transformed.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
This statement is a fundamental principle in physics known as the law of conservation of energy. It states that energy cannot be created or destroyed, only converted from one form to another. This means that the total amount of energy in a closed system remains constant. Therefore, the given answer, true, is correct.Rate this question:
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- 17.
When you get into a car with hot black leather in the middle of the summer and you get toasted, this is an example of?
- A.
Radiation
- B.
Conduction
- C.
Convection
Correct Answer
B. ConductionExplanation
When you get into a car with hot black leather in the middle of the summer and you get toasted, it is an example of conduction. Conduction is the transfer of heat through direct contact between objects or substances. In this case, the heat from the hot black leather is transferred to your body through direct contact, causing you to feel toasted.Rate this question:
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- 18.
These images are examples of:
- A.
Conduction
- B.
Convection
- C.
Radiation
Correct Answer
B. ConvectionExplanation
These images are examples of convection. Convection is the transfer of heat through the movement of a fluid, such as air or water. In the images, we can see the movement of air or water molecules, indicating the transfer of heat from one place to another. This is a characteristic of convection, where heat is transferred by the movement of the medium itself.Rate this question:
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- 19.
The temperature at which a solid turns into a liquid is called the: M_______________ P_________
Correct Answer
melting pointExplanation
The term "melting point" refers to the temperature at which a solid substance undergoes a phase change and transforms into a liquid state. It is a characteristic property of each substance and can be used to identify and differentiate between different materials.Rate this question:
- 20.
Heat conversions take place in which of the below?
- A.
Air
- B.
Land
- C.
Water
Correct Answer(s)
A. Air
B. Land
C. WaterExplanation
Heat conversions can take place in air, land, and water. This means that heat energy can be transferred and transformed in all three mediums. For example, in air, heat can be transferred through convection, where warm air rises and cool air sinks. In land, heat can be conducted through the ground, and in water, heat can be transferred through conduction and convection. Therefore, heat conversions can occur in all of these mediums.Rate this question:
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Current Version
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Jun 24, 2024Quiz Edited by
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May 25, 2014Quiz Created by
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