Heat & Temperature Post Test
Testing the knowledge of heat & temperature.
Questions and Answers
- 1.
Define "temperature".
- A.
Temperature is how hot or cold an object is.
- B.
Temperature is how you feel when you touch an object.
- C.
Temperature is hotness or coldness of an object.
- D.
Temperature is a measurement of the degree of "hotness" of an object.
Correct Answer
D. Temperature is a measurement of the degree of "hotness" of an object.Explanation
Temperature is defined as a measurement of the degree of "hotness" or coldness of an object. It is a quantitative value that represents the average kinetic energy of the particles within the object. This measurement allows us to compare the relative hotness or coldness of different objects and is commonly measured using various scales such as Celsius, Fahrenheit, or Kelvin.Rate this question:
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- 2.
Is your sense of touch good enough for measuring temperature?
- A.
Yes.
- B.
No.
Correct Answer
B. No.Explanation
The question asks whether our sense of touch is good enough for measuring temperature. The correct answer is "No" because our sense of touch is not precise enough to accurately measure temperature. While we can feel if something is hot or cold, our sense of touch is subjective and can vary from person to person. To measure temperature accurately, we need to use tools such as thermometers that provide objective readings.Rate this question:
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- 3.
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 because temperature is typically measured in degrees Celsius. This unit is commonly used in scientific and everyday contexts to measure temperature. Metres and centimetre-cube are units used to measure length and volume respectively, while degree is a unit used in measuring angles or gradients. Therefore, Degree Celsius is the appropriate unit for temperature measurement.Rate this question:
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- 4.
What happens to the temperature and the liquid level of the thermometer when it is placed in cold water?
- A.
The temperature drops and the liquid level rises.
- B.
The temperature rises and the liquid level rises.
- C.
The temperature drops and the liquid level rises.
- D.
The temperature drops and the liquid level drops.
Correct Answer
D. The temperature drops and the liquid level drops. -
- 5.
Absolute Zero is known as...?
- A.
The temperature that water freezes
- B.
The temperature where particles of matter vibrate more
- C.
The temperature where particles of matter vibrate almost to a stop
- D.
The temperature where water boils
Correct Answer
C. The temperature where particles of matter vibrate almost to a stopExplanation
Absolute zero is the temperature at which particles of matter, such as atoms and molecules, have the least amount of energy and therefore vibrate almost to a stop. It is the lowest temperature possible, equivalent to -273.15 degrees Celsius or 0 Kelvin. At this temperature, all molecular motion ceases, making it a fundamental concept in physics and thermodynamics.Rate this question:
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- 6.
What is thermal expansion?
- A.
The increase in volume of a substance because of an increase in temperature
- B.
The decrease in volume of a substance because of a decrease in temperature
- C.
The increase in volume of a substance because of a decrease in temperature
- D.
The decrease in space an object takes up because of an increase in temperature
Correct Answer
A. The increase in volume of a substance because of an increase in temperatureExplanation
Thermal expansion refers to the increase in volume of a substance when its temperature increases. As the temperature rises, the particles in the substance gain kinetic energy and move more vigorously, causing them to spread apart and occupy a larger space. This expansion can be observed in various materials, such as solids, liquids, and gases, and is an important concept in engineering and construction to account for the changes in dimensions that occur with temperature variations.Rate this question:
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- 7.
Rising warm air currents is an example of
- A.
Radiation
- B.
Conduction
- C.
Convection
Correct Answer
C. ConvectionExplanation
Rising warm air currents are an example of convection because convection is the transfer of heat through the movement of fluids (in this case, air). When warm air rises, it creates a current that carries the heat energy with it. This process is commonly observed in weather patterns, where warm air rises and cooler air moves in to replace it. Convection is different from radiation and conduction, which involve the transfer of heat through electromagnetic waves and direct contact, respectively.Rate this question:
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- 8.
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. ConvectionExplanation
A thermometer works because the liquid in it expands or contracts when heated or cooled. This expansion or contraction causes the liquid to rise or fall in the thermometer, indicating the temperature. Convection is the process of heat transfer through the movement of a fluid, such as the liquid in the thermometer. As the liquid in the thermometer is heated, it becomes less dense and rises, while the cooler liquid sinks. This movement of the liquid is an example of convection.Rate this question:
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- 9.
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 transfer of heat between objects that are in direct contact with each other. In the case of the atmosphere, air molecules near the Earth's surface are heated by the contact with the warm ground. As these molecules gain energy, they collide with neighboring molecules and transfer heat to them, resulting in the overall heating of the air. This process continues, causing the air to become warmer as we move away from the surface.Rate this question:
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- 10.
True or False higher temperature means faster moving molecules
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Higher temperature means that the molecules in a substance have more thermal energy. This increased energy causes the molecules to move faster and collide more frequently with each other, leading to an overall increase in the speed of molecular motion. Therefore, it is true that higher temperature corresponds to faster moving molecules.Rate this question:
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- 11.
True or false - air is a great conductor of heat
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Air is a poor conductor of heat. Unlike solids, which have tightly packed particles that can transfer heat energy through direct contact, air is made up of loosely packed particles that are not efficient at transferring heat. However, air can still indirectly transfer heat through convection, where heated air rises and cooler air sinks, creating a circulation of heat. This may be why some people mistakenly believe that air is a good conductor of heat.Rate this question:
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- 12.
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 a fluid. When water is heated, the molecules gain energy and move faster, causing them to spread out and become less dense. The less dense, heated water rises to the top, while the cooler, denser water sinks to the bottom. This creates a circular motion as the heated water continuously rises and the cooler water continuously sinks. This process is known as convection and is responsible for the boiling of water.Rate this question:
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- 13.
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. ConductionExplanation
Conduction is the transfer of heat through direct contact between two objects. In this scenario, the hot black leather of the car seats directly transfers heat to the person's buns when they sit on it. This is an example of conduction because the heat is being transferred through direct contact between the person's body and the hot leather surface.Rate this question:
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- 14.
When rocks are heated by the warmth of the sun this is an example of?
- A.
Radiation
- B.
Conduction
- C.
Convection
Correct Answer
A. RadiationExplanation
When rocks are heated by the warmth of the sun, it is an example of radiation. Radiation is the transfer of heat energy through electromagnetic waves, such as sunlight. In this case, the rocks are absorbing the radiant heat energy from the sun, causing them to heat up.Rate this question:
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- 15.
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 the metal spoon is placed in the cup of hot water, the 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 faster, increasing its temperature. Therefore, the spoon heats up due to the conduction of heat energy from the water to the metal.Rate this question:
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- 16.
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. ConvectionExplanation
During a house fire, the smoke and flames rise up due to convection. Convection is the process of heat transfer through the movement of a fluid (in this case, air) caused by density differences. As the fire heats up the air, it becomes less dense and rises, while cooler air near the floor moves in to replace it. This creates a convection current, causing the smoke and flames to rise up towards the ceiling. The air near the floor remains cooler and less smoky because it has not been heated by the fire yet.Rate this question:
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- 17.
When heat is given off by light this type of heat is known as?
- A.
Radiation
- B.
Conduction
- C.
Convection
Correct Answer
A. RadiationExplanation
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 through empty space.Rate this question:
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- 18.
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. This process occurs when heat energy is transferred from the hotter substance to the cooler substance through direct molecular collision. Unlike convection and radiation, which involve the transfer of heat through a medium or electromagnetic waves, conduction requires direct contact between the substances. Therefore, conduction is the correct answer for the given question.Rate this question:
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- 19.
The rays in this picture is an example of
- A.
Conduction
- B.
Convection
- C.
Radiation
Correct Answer
C. RadiationExplanation
The rays in the picture are an example of radiation because they are transferring heat energy through electromagnetic waves. Radiation does not require a medium to transfer heat, unlike conduction and convection which require a solid or fluid medium.Rate this question:
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- 20.
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
In a hot air balloon, the air inside the balloon is heated. As the air gets heated, it becomes less dense and starts to rise. This creates a convection current, where the hot air rises and the cooler air sinks. This process of heat transfer through the movement of a fluid (in this case, air) is known as convection. Therefore, the heating and circulation of air in a hot air balloon is an example of convection.Rate this question:
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- 21.
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
When you walk barefoot on the hot street, the heat from the street is transferred to your toes through direct contact. This process is known as conduction. Conduction occurs when there is a transfer of heat between objects or substances that are in direct contact with each other. In this case, the heat energy from the hot street is transferred to your toes, resulting in the burning sensation.Rate this question:
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- 22.
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. RadiationExplanation
The boy sitting by the campfire feeling warm even though he is 10 feet away is an example of radiation. Radiation is the transfer of heat through electromagnetic waves, such as infrared radiation. In this case, the heat from the campfire is radiating outwards in all directions and reaching the boy, even though there is no direct contact between them.Rate this question:
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- 23.
Light waves traveling through empty space
- A.
Conduction
- B.
Convection
- C.
Radiation
Correct Answer
C. RadiationExplanation
Light waves traveling through empty space can be explained by radiation. Radiation refers to the transfer of energy through electromagnetic waves, such as light, without the need for a medium. In the case of light waves traveling through empty space, there is no medium for conduction or convection to occur. Therefore, radiation is the most suitable explanation for light waves traveling through empty space.Rate this question:
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- 24.
What unit do we measure Energy in?
- A.
MPH
- B.
Kinetic Energy
- C.
Joules (j)
- D.
Einsteinium
Correct Answer
C. Joules (j)Explanation
Energy is a physical quantity that is measured in joules (j). Joules are the standard unit of measurement for energy in the International System of Units (SI). This unit is used to quantify various forms of energy, including kinetic energy, potential energy, and thermal energy. MPH is a unit of measurement for speed, not energy. Einsteinium is a chemical element and is not a unit of measurement for energy.Rate this question:
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- 25.
The sun gives us thermal energy constantly, how does that energy get to us? Conduction Convection Radiation
- A.
Radiation
- B.
Conduction
- C.
Convection
Correct Answer
A. RadiationExplanation
The sun gives us thermal energy through radiation. Radiation is the transfer of heat energy in the form of electromagnetic waves, such as light and infrared radiation. These waves can travel through the vacuum of space and do not require a medium to transfer heat. When the sun's rays reach the Earth, they transfer thermal energy to the atmosphere and land, which then heats the air and surfaces. This is how the sun's thermal energy reaches us.Rate this question:
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