Chapter 12: The Laws of Thermodynamics Flashcards
[100 J] of heat is added to a gas, and the gas expands at constant pressure. Is it possible that the internal energy increases by [100 J]?
Select one:
a. Yes
b. No; the increase in the internal energy is greater than [100 J], since work is done by the gas
c. No; the increase in the internal energy is less than [100 J], since work is done by the gas
No; the increase in the internal energy is less than [100 J], since work is done by the gas
A gas is compressed isothermally, and its internal energy increases. Is the gas an ideal gas?
Select one:
a. No, because if the temperature of an ideal gas remains constant, its internal energy must decrease
b. No, because if the temperature of an ideal gas remains constant, its internal energy must also remain constant
c. Yes, because if the temperature of an ideal gas remains constant, its internal energy must increase.
No, because if the temperature of an ideal gas remains constant, its internal energy must also remain constant
A gas is enclosed within a chamber that is fitted with a frictionless piston. The piston is then pushed in, thereby compressing the gas. Which statement below regarding this process is consistent with the first law of thermodynamics?
Select one:
a. The internal energy of the gas will decrease
b. The internal energy of the gas may increase, decrease, or remain the same depending on the amount of heat that the gas gains or loses.
c. The internal energy of the gas will increase
d. The internal energy of the gas will not change
The internal energy of the gas may increase, decrease, or remain the same depending on the amount of heat that the gas gains or loses.
A material undergoes an isovolumetric process that is also adiabatic. Is the internal energy of the material at the end of the process Select one: a. greater than b. less than, or c. the same as it was at the start?
the same as it was at the start
Consider a hypothetical device that takes10,000 J of heat from a hot reservoir and 5000 J of heat from a cold reservoir (whose temperature is greater than 0K) and produces 15,000 J of work. What can be said about this device?
Select one:
a. It violates both the first and second laws of thermodynamics
b. It violates the first law of thermodynamics but not the second law.
c. It violates the second law of thermodynamics but not the first law.
d. It does not violates either the first or second law of thermodynamics.
It violates the second law of thermodynamics but not the first law.
In which of the following thermodynamic processes is the temperature constant? Select one: a. Isothermal Process b. Isobaric Process c. Adiabatic Process d. Isovolumetric Process
Isothermal Process
Spaghetti needs to cook at the temperature of boiling water for 10 mins. To cook spaghetti in an open pot using the least amount of energy, should you
Select one:
a. Turn up the burner to its fullest so the water vigorously boils
b. Add more water to the spaghetti
c. Turn down the burner so the water barely boils
Turn down the burner so the water barely boils
Which of the following changes would increase the maximum theoretical efficiency of a heat engine? Select one: a. Increase [Q_H], Increase [Q_C] b. Increase [Q_H], Decrease [Q_C] c. Decrease [Q_H], Increase [Q_C] d. Decrease [Q_H], Decrease [Q_C]
Increase [Q_H], Decrease [Q_C]
Which of the following processes does not involve a change in entropy?
Select one:
a. An electric heater raises the temperature of a cup of water by [20^0 C]
b. A ball rolls up a ramp, decreasing in speed as it rolls higher.
c. A basketball is dropped 2 m and bounces until it comes to rest.
d. The sun shines on a black surface and warms it.
A ball rolls up a ramp, decreasing in speed as it rolls higher.
You have driven your car for a while and now turn off the engine. Your car's radiator is at a higher temperature than the air around it. Considering the radiator as the system, as the radiator cools down we can say that Select one: a. [Q> 0] b. Q < 0 c. Q = 0
Q < 0
