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Practice Questions



This activity contains 25 questions.

Question 1.
Which of the following is a unit for internal energy?


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Question 2.
Which of the following is an English unit for heat?


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Question 3.
The unit of emissivity is


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Question 4.
The unit for heat conduction would be a


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Question 5.
The unit for radiant heat transfer is


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Question 6.
A spaceship is drifting in an environment where the acceleration of gravity is essentially zero. As the air on one side of the cabin is heated by an electric heater, what is true about the convection currents caused by this heating?


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Question 7.

In a liquid at a given temperature, the molecules are moving in every direction, some fast, some slowly. Electrical forces of adhesion tend to hold them together. However, occasionally one molecule gains enough energy (as a result of collisions) so that it pulls loose from its neighbors and escapes from the liquid. Which of the following can best be understood in terms of this phenomena?

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Question 8.
Radiant energy is proportional to


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Question 9.
Conduction is proportional to


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Question 10.
Conduction is inversely proportional to


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Question 11.
If the thickness of a brick is 8 cm and its conductivity is 0.8J/s*m*Co, what is its thermal resistance?


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Question 12.
If a wooden wall is 8 cm thick and has a conductivity of .08 J/s*m*Co, what is its thermal resistance?


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Question 13.
If a wall is composed of 8 cm of wood and 8 cm of brick, what would be its total thermal resistance?


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Question 14.
A piece of hot metal is put into an equal mass of water. The water temperature rises 5 degrees and the metal's temperature drops 10 degrees. What is the specific heat of the metal?


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Question 15.
The specific heat of glass is 0.2 kcal/kg. If you put 1 kg of glass in contact with an equal mass of water and its temperature drops 5 degrees, by how much will the temperature of the water rise?


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Question 16.
How much heat is needed to boil 1 kg of water to steam?


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Question 17.
How much heat does it take to melt 1 kg of ice into water?


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Question 18.
In the formula U = (3/2)nRT what is n?


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Question 19.
In the formula U = (3/2)NkT what is N?


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Question 20.
What is the internal energy (to the nearest joule) of 10 moles of helium at 100 K?


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Question 21.
What is the internal energy (to the nearest joule) of 10 moles of oxygen at 100 K?


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Question 22.
On a clear day at the equator with the sun directly overhead, how long would it take to warm 10 kg of water 15 Co if the emissivity of the 1.0 m 2 surface is 1?


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Question 23.
On a very clear dry dark night, little radiation is received from the sky. How much energy, in one hour, will a perfectly black object, with 2 m2 of surface area exposed only to the sky, radiate if its temperature is 50 oC ?


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Question 24.
Air is a better insulator than fiberglass, yet we fill the air spaces in our walls with fiberglass insulation. Why do we do this?


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Question 25.
Can you take a picture of a perfectly black dog?


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