Choose the BEST answer to the following: Thermal convection mainly involves (a) radiant energy. (b) fluids. (c) insulators. (d) All of these.

Q: Which of the following is NOT unit of heat? O calorie O Btu sanor O none of these Joules

A: The SI unit of energy is Joule.  The other units are calorie and Btu.  1 calorie = 4.18 J  1 Btu =…

Q: Hovering over the surface of our skin is a layer of air some 3 millimeters in thickness that acts as…

A:

Q: Why is thermal pollution a relative term?

A: Thermal pollution is the thermal energy pumped into the atmosphere, water bodies, etc. by the…

Q: Which has the greater amount of internal energy- an iceberg or a cup of hot coffee? Defend your…

A: The internal energy is the sum of all energy within the substance.

Q: The Earth is not in thermal equilibrium with sun, Why?

A: The temperature of the sun and that of earth aren’t the same. Sun is at a very high temperature and…

Q: Consider two glasses, one filled with water and the other half-full, both at the same temperature.…

A: There are two glasses, one of which is completely filled, and the other is half filled, both at the…

Q: Does convection happen when you mix water and food coloring that are at the same temperature?

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Q: What heats faster, land or water?

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Q: In the last chapter, free convection was explained as the result of buoyant forces on hot fluids.…

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Q: How does the law of the conservation of energy relate to the first law of thermodynamics?

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Q: Is it the boiling of water or the higher temperature of water that cooks food faster in a pressure…

A: Food can be cooked more quickly in a pressure cooker.

Q: How does the second law of thermodynamics relate to the direction of heat flow?

A: Let us understand this with an example. A hot cup of coffee is kept in open atmosphere.

Q: What does it mean to say that two systems are in thermal equilibrium?

A: What does it mean to say that two systems are in thermal equilibrium?

Q: why a metal spoon left in a pot of boiling water gets hot so fast ?

A: In metals heat transfer takes place by conduction . In conduction heat transfer takes place by…

Q: Boiling water, uncovered, on a stove is an example of what method of heat transfer?

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Q: What are the uses of specific heat in our daily life?

A: Substances having a small specific heat capacity, are very useful as material in cooking instruments…

Q: Which is largest unit of heat transfer- Calorie, calorie, joule?

A:

Q: This is rooted in qualitative ideas of "hot" and "cold"

A: As we know that temperature is defined as the degree of hotness and coldness of a body.So we can say…

Q: Why does a two-story house that is roughly a cube suffer less heat loss than a rambling one-story…

A: For a given volume, a one-story house has less surface area than a two-story house. As we know rate…

Q: explain the terms convection and conduction?

A: both conduction and convection are mode of heat transfer.conduction is the process in which transfer…

Q: What two energies are involved in the interaction of radiant energy?

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Q: What happens to the volume of air as it rises? What happens to its temperature?

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Q: Name the method of heat transfer which doesnot depend on gravity.

A: In radiation, heat is transferred without any motion of the medium particles

Q: Why heat is called the disordered energy?

A: As the heat energy of a system increases, its entropy will increase. Entropy is a measure of…

Q: What type of heat transfer helps the balloon rise?

A: To determine the mode of heat transfer that helps the balloon to rise.

Q: Which will undergo the greater rate of cooling- a red hot poker in warm oven or red hot poker in…

A: According to Newton’s law of cooling, rate of cooling is directly proportional to the temperature…

Q: What is meant by thermodynamics?

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Q: How does the science of heat transfer differ from the science of thermo dynamics?

A: The thermodynamics is the framework of science which deals with the system’s energy interaction…

Q: Provide a single illustration of conduction, convection, and radiation. Be as specific as possible.

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Q: In what ways are Heat and Temperature different? How are they related?

A: Heat is a form of energy. Temperature is the physical quantity which gives the degree of hotness of…

Q: Microwaving your burrito is an example of what type of heat transfer?

A: Heat transfer by thermal radiation is due to electromagnetic waves

Q: Why is heating more efficient in large apartment buildings than in single-family dwellings?

A: The surface to volume ratio is inversely proportional to the dimension of the building. Hence, a…

Q: Why are heat and temperature not the same thing?

A: To explain : The difference between the heat and temperture

Q: What actually is thermal pollution?

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Q: What are the conditions of thermal equilibrium ?

A: Thermal equilibrium-is the state at which two bodies in contact can exchange energy freely. Systems…

Q: What determines whether an object is a net absorber or net emitter of radiant energy at given time?

A: All substance above absolute temperature emit radiant energy. Whether the object emits more than it…

Q: Does heat flow into cold areas or does cold flow into hot areas?

A: Yes heat flows from hot to cold area or we can say it moves with the help of particle or atom. for…

Q: What is Newtons law of cooling?

A: Newton’s law of cooling can be defined as: