Heat Conduction Convection And Radiation Quiz Yr 9 Sci

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Questions and Answers
  • 1. 

    What is heat conduction?

  • 2. 

    A thermometer works because the liquid in it contracts when heated this is an example of

    • A.

      Radiation

    • B.

      Conduction

    • C.

      Convection

    Correct Answer
    C. Convection
    Explanation
    A thermometer works by measuring the expansion or contraction of a liquid, usually mercury or alcohol, in response to changes in temperature. When the liquid is heated, it expands and rises up the thermometer, and when it is cooled, it contracts and goes down. This movement of the liquid is an example of convection, which is the transfer of heat through the movement of a fluid.

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  • 3. 

    Rising warm air currents is an example of

    • A.

      Radiation

    • B.

      Conduction

    • C.

      Convection

    Correct Answer
    C. Convection
    Explanation
    Convection is the transfer of heat through the movement of fluids (liquids or gases). Rising warm air currents are a perfect example of convection because as the air gets heated, it becomes less dense and rises, while the cooler air sinks to take its place. This creates a continuous cycle of warm air rising and cool air sinking, which helps in the transfer of heat.

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  • 4. 

    How is air heated in our atmosphere

    • A.

      Radiation

    • B.

      Conduction

    • C.

      Convection

    Correct Answer
    B. Conduction
    Explanation
    Air is heated in our atmosphere through conduction. Conduction is the transfer of heat energy from one molecule to another through direct contact. In the atmosphere, air molecules near the Earth's surface are heated by contact with the warm ground. These heated air molecules then collide with neighboring molecules, transferring their energy and causing them to heat up as well. This process continues, creating a chain reaction that heats up the air in the atmosphere.

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  • 5. 

    True or False the sun DIRECTLY heats the air in our atmosphere

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    False. The sun does not directly heat the air in our atmosphere. Instead, it heats the Earth's surface, which in turn warms the air through conduction and convection. The sun's rays penetrate the atmosphere and reach the Earth's surface, where they are absorbed and converted into heat energy. This heat energy is then transferred to the air molecules in contact with the surface, causing them to warm up and rise, creating air currents and weather patterns.

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  • 6. 

    True or False higher temperature means faster moving molecules

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Higher temperature means faster moving molecules because temperature is a measure of the average kinetic energy of the molecules in a substance. When the temperature increases, the molecules gain more energy and move faster. This increased movement leads to more collisions between molecules, resulting in a faster overall rate of molecular motion. Therefore, it can be concluded that higher temperature corresponds to faster moving molecules.

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  • 7. 

    True or false - air is a great conductor of heat

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Air is not a good conductor of heat. It is actually a poor conductor because its molecules are widely spaced and do not transfer heat energy efficiently. However, air can still transfer heat through convection, which is the movement of heat through the circulation of air particles. This may be why the answer is given as "True", as air can still transfer heat through convection, but it is not a great conductor of heat compared to materials like metals.

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  • 8. 

    The reason why water boils causing the circular motion is due to?

    • A.

      Radiation

    • B.

      Conduction

    • C.

      Convection

    Correct Answer
    C. Convection
    Explanation
    Water boils causing circular motion due to convection. Convection is the transfer of heat through the movement of a fluid. When water is heated, the molecules near the heat source gain energy and become less dense, causing them to rise. As these molecules rise, cooler and denser molecules from the surrounding areas move in to take their place. This creates a circular motion, known as convection currents, which causes the water to boil.

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  • 9. 

    When you get into a car with hot black leather in the middle of the summer and you get your buns toasted, this is an example of?

    • A.

      Radiation

    • B.

      Conduction

    • C.

      Convection

    Correct Answer
    B. Conduction
    Explanation
    When you sit on hot black leather in a car, the heat is transferred from the leather to your body through direct contact. This process of heat transfer through direct contact is called conduction. Conduction occurs when there is a temperature difference between two objects in contact, and heat flows from the warmer object to the cooler object. In this case, the hot leather transfers its heat to your body, causing your buns to get toasted.

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  • 10. 

    When rocks are heated by the warmth of the sun this is an example of?

    • A.

      Radiation

    • B.

      Conduction

    • C.

      Convection

    Correct Answer
    A. Radiation
    Explanation
    When rocks are heated by the warmth of the sun, the transfer of heat occurs through radiation. Radiation is the process by which heat is transferred through electromagnetic waves, such as infrared radiation, without the need for a medium. In this case, the rocks absorb the sun's radiation and increase in temperature. Conduction and convection, on the other hand, involve the transfer of heat through direct contact or movement of a fluid, respectively, and are not applicable in this scenario.

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  • 11. 

    Take the Heat Transfer test. When heat is given off by light this type of heat is known as? radiation conduction convection this type of heat transfer occurs when heat moves from one molecule to another. radiaiton conduction convection During a house fire, the smoke and flames rise up, but the air down near the floor is cooler and less smoky. This is an example of: radiation conduction convection 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: radiation conduction convection When warm air is pushed up and cold air sinks this is an example of:

    • A.

      Radiation

    • B.

      Conduction

    • C.

      Convection

    Correct Answer
    C. Convection
    Explanation
    Convection is the correct answer because it refers to the transfer of heat through the movement of fluid or gas. In the given example, warm air rising and cold air sinking demonstrates convection as the warm air is being pushed up and the cold air is moving downwards.

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  • 12. 

    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. Conduction
    Explanation
    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 transfer their kinetic energy to the particles in the spoon, causing the spoon to heat up. Conduction occurs when there is a temperature difference between two objects in direct contact, and it is the main mode of heat transfer in solids.

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  • 13. 

    During a house fire, the smoke and flames rise up, but the air down near the floor is cooler and less smoky. This is an example of

    • A.

      Radiation

    • B.

      Conduction

    • C.

      Convection

    Correct Answer
    C. Convection
    Explanation
    During a house fire, convection occurs as the hot air and smoke rise upwards, creating a flow of heat and gases. The cooler air near the floor is less smoky because the smoke tends to rise, leaving the lower areas relatively clear. This movement of heat and gases through the vertical motion of air is a prime example of convection.

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  • 14. 

    this type of heat transfer occurs when heat moves from one molecule to another.

    • A.

      Radiation

    • B.

      Conduction

    • C.

      Convection

    Correct Answer
    B. Conduction
    Explanation
    Conduction is the correct answer because it refers to the transfer of heat between molecules through direct contact. In this process, heat energy is transferred from one molecule to another by means of molecular collisions. Unlike radiation and convection, which involve the transfer of heat through electromagnetic waves or the movement of fluids, conduction specifically involves the direct transfer of heat between molecules.

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  • 15. 

    When heat is given off by light this type of heat is known as?

    • A.

      Radiation

    • B.

      Conduction

    • C.

      Convection

    Correct Answer
    A. Radiation
    Explanation
    When heat is given off by light, it is known as radiation. Radiation is the transfer of heat through electromagnetic waves, such as infrared radiation. Unlike conduction and convection, which require a medium to transfer heat, radiation can occur in a vacuum as well.

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  • 16. 

    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. Conduction
    Explanation
    Conduction is the transfer of heat between substances that are in direct contact with each other. In this process, heat energy is transferred from the hotter substance to the colder substance through direct molecular collisions. Unlike convection and radiation, which involve the transfer of heat through the movement of fluids or electromagnetic waves, conduction occurs through direct physical contact.

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  • 17. 

    • A.

      Conduction

    • B.

      Convection

    • C.

      Radiation

    Correct Answer
    B. Convection
  • 18. 

    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. Convection
    Explanation
    The process described in the question, where the air in the hot air balloon is heated and circulates, is an example of convection. Convection is the transfer of heat through the movement of a fluid, in this case, the air. As the air inside the balloon is heated, it becomes less dense and rises, creating a convection current. This causes the air to circulate within the balloon, resulting in the balloon's ascent.

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  • 19. 

    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. Conduction
    Explanation
    Conduction is the transfer of heat through direct contact between two objects or substances. In this scenario, the hot street is in direct contact with your bare feet, causing the heat to transfer from the street to your toes through conduction.

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  • 20. 

    A boy sits to the side of a campfire.  He is 10 feet away, but still feels warm.  This is an example of ...

    • A.

      Conduction

    • B.

      Convection

    • C.

      Radiation

    Correct Answer
    C. Radiation
    Explanation
    The boy feeling warm even though he is 10 feet away from the campfire is an example of radiation. Radiation is the transfer of heat energy through electromagnetic waves, such as infrared rays, without the need for direct contact. In this case, the campfire emits heat in the form of radiation, and the boy feels warm as the heat waves reach him even though he is not in direct contact with the fire.

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  • 21. 

    The transfer of energy in fluids or gases

    • A.

      Conduction

    • B.

      Convection

    • C.

      Radiation

    Correct Answer
    B. Convection
    Explanation
    Convection is the transfer of energy in fluids or gases through the movement of particles. When a fluid or gas is heated, the particles gain energy and move faster, causing them to spread out and become less dense. This hot, less dense fluid rises while the cooler, denser fluid sinks. This movement of the fluid transfers heat energy from one place to another. Therefore, convection is the correct answer for the transfer of energy in fluids or gases.

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  • 22. 

    Light waves traveling through empty space

    • A.

      Conduction

    • B.

      Convection

    • C.

      Radiation

    Correct Answer
    C. Radiation
    Explanation
    Light waves traveling through empty space is an example of radiation. Radiation is the transfer of energy through electromagnetic waves without the need for a medium or direct contact. In this case, light waves can travel through the vacuum of empty space because they are electromagnetic waves. Unlike conduction and convection, which require a medium or material to transfer heat, radiation can occur in a vacuum and does not rely on physical contact or the movement of particles.

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  • 23. 

    A thermometer works because the liquid in it contracts when heated this is an example of

    • A.

      Radiation

    • B.

      Conduction

    • C.

      Convection

    Correct Answer
    C. Convection
    Explanation
    A thermometer works by measuring the expansion or contraction of a liquid, usually mercury or alcohol, in response to changes in temperature. When the liquid is heated, it expands and rises up the narrow tube of the thermometer, indicating a higher temperature. This process is an example of convection, as the heat causes the molecules in the liquid to move faster and spread out, resulting in the expansion and rise of the liquid.

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  • 24. 

    Rising warm air currents is an example of

    • A.

      Radiation

    • B.

      Conduction

    • C.

      Convection

    Correct Answer
    C. Convection
    Explanation
    Rising warm air currents are an example of convection because convection is the transfer of heat through the movement of a fluid (in this case, air). As the air near the ground gets heated, it becomes less dense and rises, carrying the heat with it. This creates a cycle where cooler air moves in to replace the rising warm air, resulting in the transfer of heat through the movement of the air.

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  • 25. 

    How is air heated in our atmosphere

    • A.

      Radiation

    • B.

      Conduction

    • C.

      Convection

    Correct Answer
    B. Conduction
    Explanation
    Air is heated in our atmosphere through conduction. Conduction is the transfer of heat through direct contact between molecules. In the atmosphere, the air near the surface of the Earth is heated by the contact with the warm ground. As the air molecules gain heat energy, they become more energetic and move faster, causing the air to become warmer. This process of heat transfer through direct contact is known as conduction.

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  • 26. 

    True or False the sun DIRECTLY heats the air in our atmosphere

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    False. The sun does not directly heat the air in our atmosphere. Instead, it heats the Earth's surface, which in turn heats the air through a process called conduction. The sun's energy is absorbed by the Earth's surface, causing it to warm up. This heat is then transferred to the surrounding air molecules, leading to the heating of the atmosphere.

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  • 27. 

    True or False higher temperature means faster moving molecules

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Higher temperature means that the average kinetic energy of the molecules in a substance increases. As kinetic energy is directly related to the speed of the molecules, higher temperature leads to faster moving molecules. Therefore, the statement "higher temperature means faster moving molecules" is true.

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  • 28. 

    True or false - air is a great conductor of heat

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Air is not a great conductor of heat. It is actually a poor conductor of heat. Air is a good insulator, which means it does not easily allow the transfer of heat. This is why we use insulation materials, like air pockets in clothing or double-glazed windows, to trap air and prevent heat loss.

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  • 29. 

    The reason why water boils causing the circular motion is due to?

    • A.

      Radiation

    • B.

      Conduction

    • C.

      Convection

    Correct Answer
    C. Convection
    Explanation
    The circular motion of boiling water is caused by convection. Convection occurs when heat is transferred through the movement of a fluid. In the case of boiling water, the heat from the heat source is transferred to the water molecules at the bottom of the pot. As these molecules gain energy, they become less dense and rise to the top, while the cooler, denser water sinks to the bottom. This creates a circular motion, known as convection currents, causing the water to boil uniformly.

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  • 30. 

    When you get into a car with hot black leather in the middle of the summer and you get your buns toasted, this is an example of?

    • A.

      Radiation

    • B.

      Conduction

    • C.

      Convection

    Correct Answer
    B. Conduction
    Explanation
    When you sit on hot black leather in a car, the heat is transferred from the leather to your body through direct contact. This process is known as conduction. Conduction occurs when heat is transferred between objects that are in direct contact with each other. In this case, the hot leather and your body are in contact, allowing the heat to transfer from the leather to your buns.

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  • 31. 

    When rocks are heated by the warmth of the sun this is an example of?

    • A.

      Radiation

    • B.

      Conduction

    • C.

      Convection

    Correct Answer
    A. Radiation
    Explanation
    When rocks are heated by the warmth of the sun, it is an example of radiation. Radiation is the transfer of heat through electromagnetic waves, such as sunlight. In this case, the rocks absorb the radiant energy from the sun and increase in temperature. Conduction and convection, on the other hand, involve the transfer of heat through direct contact or the movement of fluids, respectively, which are not applicable in this scenario.

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  • 32. 

    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. Conduction
    Explanation
    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 higher temperature of the water causes the molecules in the spoon to vibrate more rapidly, transferring their energy to the cooler spoon. As a result, the spoon heats up. Conduction is the transfer of heat through direct contact between objects or substances with different temperatures.

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  • 33. 

    During a house fire, the smoke and flames rise up, but the air down near the floor is cooler and less smoky. This is an example of

    • A.

      Radiation

    • B.

      Conduction

    • C.

      Convection

    Correct Answer
    C. Convection
    Explanation
    During a house fire, the smoke and flames rise up due to convection. Convection is the process of heat transfer through the movement of fluids or gases. In this case, the hot air and smoke rise because they are less dense than the cooler air near the floor. This movement of hot air and smoke upwards creates a convection current, resulting in the cooler and less smoky air remaining near the floor.

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  • 34. 

    this type of heat transfer occurs when heat moves from one molecule to another.

    • A.

      Radiation

    • B.

      Conduction

    • C.

      Convection

    Correct Answer
    B. Conduction
    Explanation
    Conduction is the correct answer because it refers to the transfer of heat from one molecule to another. In conduction, heat is transferred through direct contact between molecules, where the molecules with higher energy transfer their energy to molecules with lower energy. This process continues until thermal equilibrium is reached. Unlike convection and radiation, which involve the movement of fluids or electromagnetic waves, conduction specifically involves the transfer of heat through direct molecular contact.

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  • 35. 

    When heat is given off by light this type of heat is known as?

    • A.

      Radiation

    • B.

      Conduction

    • C.

      Convection

    Correct Answer
    A. Radiation
    Explanation
    When heat is given off by light, it is known as radiation. Radiation is the transfer of heat energy through electromagnetic waves, such as infrared waves. Unlike conduction and convection, which involve the transfer of heat through direct contact or movement of a medium, radiation can occur in a vacuum or through transparent materials. This type of heat transfer is commonly observed when feeling the warmth of the sun or standing near a fire.

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  • 36. 

    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. Conduction
    Explanation
    Conduction is the transfer of heat between substances that are in direct contact with each other. It occurs through direct molecular collisions, where the faster-moving molecules transfer their energy to the slower-moving molecules, causing them to heat up. This process continues until thermal equilibrium is reached, and the temperature becomes uniform throughout the substances. Conduction is an important mechanism for heat transfer in solids and plays a role in various everyday phenomena, such as touching a hot object and feeling its heat.

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  • 37. 

    The rays in this picture is an example of

    • A.

      Conduction

    • B.

      Convection

    • C.

      Radiation

    Correct Answer
    C. Radiation
    Explanation
    The rays in the picture are an example of radiation. Radiation is the transfer of heat through electromagnetic waves, such as infrared radiation. In the picture, the rays are depicted as heat being emitted from a source and spreading out in all directions. This is a characteristic of radiation, where heat is transferred without the need for direct contact or a medium to carry it.

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  • 38. 

    • A.

      Conduction

    • B.

      Convection

    • C.

      Radiation

    Correct Answer
    B. Convection
  • 39. 

    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. Convection
    Explanation
    The air in the hot air balloon is heated, causing it to become less dense and rise. As it rises, cooler air from the surroundings flows in to take its place, creating a cycle of air movement. This process of heat transfer through the movement of a fluid is known as convection.

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  • 40. 

    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. Conduction
    Explanation
    Conduction is the transfer of heat through direct contact between objects or substances. In this scenario, the hot street directly comes into contact with the bare feet, causing the transfer of heat from the street to the toes. Therefore, the burning sensation experienced is an example of conduction.

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  • 41. 

    A boy sits to the side of a campfire.  He is 10 feet away, but still feels warm.  This is an example of ...

    • A.

      Conduction

    • B.

      Convection

    • C.

      Radiation

    Correct Answer
    C. Radiation
    Explanation
    The boy feeling warm even though he is 10 feet away from the campfire suggests that the heat is being transferred through radiation. Radiation is the transfer of heat through electromagnetic waves, which can travel through empty space. In this case, the heat from the campfire is being transferred to the boy through radiation, without the need for direct contact or a medium like air or water.

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  • 42. 

    The transfer of energy in fluids or gases

    • A.

      Conduction

    • B.

      Convection

    • C.

      Radiation

    Correct Answer
    B. Convection
    Explanation
    Convection is the transfer of energy in fluids or gases through the movement of the particles within the substance. When a fluid or gas is heated, the particles gain energy and move faster, causing them to spread out and become less dense. This leads to the rising of the warm fluid or gas, creating a convection current. As the warm fluid or gas rises, it transfers its energy to the cooler regions, which then causes the cooler fluid or gas to sink. This process allows for the transfer of heat energy from one area to another.

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  • 43. 

    Light waves traveling through empty space

    • A.

      Conduction

    • B.

      Convection

    • C.

      Radiation

    Correct Answer
    C. Radiation
    Explanation
    When light waves travel through empty space, they do so through a process called radiation. Radiation is the transfer of energy through electromagnetic waves, such as light, without the need for a medium. Unlike conduction and convection, which require a material medium for energy transfer, radiation can occur in a vacuum. Therefore, radiation is the correct answer in this context.

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  • 44. 

    Convection is heat transfer that occurs by touching the heat source.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The given statement is false. Convection is actually heat transfer that occurs through the movement of fluids, such as air or water. It involves the transfer of heat energy from one place to another by the actual movement of the fluid itself. This can occur through convection currents or the circulation of the fluid. Conduction, on the other hand, is the heat transfer that occurs by direct contact with the heat source.

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  • 45. 

    The sun is the main source for radiation heat transfer.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The sun is the main source for radiation heat transfer because it emits electromagnetic waves, including infrared radiation, which can travel through space and transfer heat energy. This radiation is responsible for heating the Earth's atmosphere, land, and oceans, and is essential for sustaining life on our planet. Other sources of radiation heat transfer include artificial sources like heaters and fire.

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  • 46. 

    Our paper spiral experiment using the light bulbs is an example of __________________.

    Correct Answer
    convection
    Explanation
    The correct answer is convection. In the paper spiral experiment using light bulbs, the heat generated by the bulbs causes the air around them to become warmer and less dense. This warm air rises while the cooler air sinks, creating a convection current. This convection process is similar to what happens in the Earth's atmosphere, where warm air rises near the equator and cool air sinks near the poles.

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  • 47. 

    The experiment that used hot water and various materials such as the nail is an example of ________________

    Correct Answer
    conduction
    Explanation
    The experiment described involves the transfer of heat from the hot water to the various materials, such as the nail, through direct contact. This process is known as conduction, where heat is transferred through the collision of particles in a solid material.

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  • 48. 

    A person touching his or her finger to a hot iron is an example of __________________________

    Correct Answer
    conduction
    Explanation
    When a person touches their finger to a hot iron, heat is transferred from the iron to their finger through direct contact. This process of heat transfer through direct contact is known as conduction. Conduction occurs when there is a temperature difference between two objects in contact, causing the heat to flow from the hotter object to the colder one. In this case, the hot iron transfers its heat energy to the person's finger, resulting in a burning sensation.

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  • 49. 

    The sun warmin up the interior of a car on a hot day is an example of _______________________

    Correct Answer
    radiation
    Explanation
    The sun warming up the interior of a car on a hot day is an example of radiation. Radiation refers to the transfer of heat through electromagnetic waves, such as sunlight. In this scenario, the sun emits radiation in the form of heat, which then penetrates through the windows of the car and warms up the interior.

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  • 50. 

    A heater warming up a room is an example of ___________________________

    Correct Answer
    convection
    Explanation
    A heater warming up a room is an example of convection because convection is the transfer of heat through the movement of a fluid, such as air. In this case, the heater warms the air in the room, causing it to rise and creating a convection current. As the warm air moves upwards, it displaces the cooler air, which then gets heated by the heater, creating a continuous cycle of warm air circulating in the room.

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  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jul 01, 2014
    Quiz Created by
    Aponator
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