2nd Law Thermodynamics And Entropy Quiz
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Welcome to the "2nd Law Thermodynamics and Entropy Quiz," an engaging and challenging exploration of one of the most intriguing aspects of physics. This quiz delves into the Second Law of Thermodynamics, a fundamental principle governing the direction of heat transfer and the inevitable increase in entropy, or disorder, within a closed system.
Through a series of thoughtfully designed questions, this quiz will test your understanding of how energy changes form and moves, and why certain processes are irreversible.
This quiz is perfect for students studying physics or engineering, educators looking for classroom resources, or anyone fascinated by how Read morethe universe operates at a fundamental level. By completing the quiz, you'll not only reinforce your knowledge but also deepen your appreciation for the elegant complexity of the laws that govern our physical world. Get ready to challenge your understanding and expand your knowledge with our "2nd Law Thermodynamics and Entropy Quiz!"
2nd Law Thermodynamics and Entropy Questions and Answers
- 1.
How is it possible that heat can spontaneously go from a cold object to a hot object?
- A.
By having one way super conductive material between them
- B.
Work can be done by the system to make this happen
- C.
Work can be done to the system to make this happen
- D.
Cold objects can never give thermal energy to hot objects
Correct Answer
C. Work can be done to the system to make this happenExplanation
According to the second law of thermodynamics, heat naturally flows from a hot object to a cold object. However, by doing work on the system, it is possible to reverse this natural flow and transfer heat from a cold object to a hot object. This can be achieved by using external energy sources to drive the heat transfer process, such as using a heat pump or a refrigeration system.Rate this question:
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- 2.
What is Entropy a measurement of?
- A.
Energy of a system
- B.
Change in energy in a chemical reaction
- C.
Temperature
- D.
Average particular energy in a system
- E.
Disorder in a system
Correct Answer
E. Disorder in a systemExplanation
Entropy is a measurement of the disorder in a system. It quantifies the randomness or chaos within a system. As entropy increases, the system becomes more disordered, and as entropy decreases, the system becomes more ordered. This concept is widely used in thermodynamics to understand the behavior of energy and matter in various processes.Rate this question:
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- 3.
What is true about entropy
- A.
If it increases in one place, it MUST decrease elsewhere
- B.
If it decreases in one place, it MUST increase elsewhere
- C.
It must decrease in the universe
- D.
It must stay constant in the universe
Correct Answer
B. If it decreases in one place, it MUST increase elsewhereExplanation
Entropy is a measure of the disorder or randomness in a system. According to the second law of thermodynamics, the total entropy of an isolated system always increases over time. Therefore, if entropy decreases in one place, it must increase elsewhere in order to maintain the overall increase in entropy in the system. This is because the decrease in entropy in one area would result in a corresponding increase in order or organization, which must be compensated by an increase in disorder or randomness somewhere else.Rate this question:
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- 4.
According to second law of thermodynamics cycle efficiency of thermodynamics must be
- A.
Less than unity
- B.
Greater than unity
- C.
Zero
- D.
None of the above
Correct Answer
A. Less than unityExplanation
The second law of thermodynamics states that heat flows from a higher temperature region to a lower temperature region spontaneously. This implies that not all the heat energy can be converted into work. The cycle efficiency is a measure of how efficiently a thermodynamic cycle converts heat into work. Since some heat energy is always lost in the process, the cycle efficiency will always be less than unity (less than 1). Therefore, the correct answer is "Less than unity".Rate this question:
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- 5.
External mechanical Irreversibility is shown by which process?
- A.
Adiabatic dissipation of work
- B.
Isothermal dissipation of work
- C.
Both of the above
- D.
None of the above
Correct Answer
C. Both of the aboveExplanation
External mechanical irreversibility is shown by both the adiabatic dissipation of work and the isothermal dissipation of work. In both processes, work is being dissipated irreversibly, meaning it cannot be fully recovered. Adiabatic dissipation of work occurs when work is done on a system without any heat transfer, resulting in an increase in entropy. Isothermal dissipation of work occurs when work is done on a system while maintaining a constant temperature, also leading to an increase in entropy. Both processes involve irreversible dissipation of work, indicating external mechanical irreversibility.Rate this question:
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- 6.
Chemical dissociation is always?
- A.
Exothermic
- B.
Endothermic
- C.
Reversible
- D.
Endothermic and reversible
Correct Answer
A. ExothermicExplanation
Chemical dissociation refers to the process in which a compound breaks down into its constituent elements or ions. This process usually releases energy in the form of heat, making it exothermic. The energy is released because the bonds between the atoms in the compound are being broken, resulting in a more stable state. Therefore, chemical dissociation is typically exothermic.Rate this question:
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- 7.
The entropy of water at zero degree celsius is?
- A.
0
- B.
5
- C.
4
- D.
2
Correct Answer
A. 0Explanation
At zero degrees Celsius, water is in its solid state, which is ice. In this state, the water molecules are arranged in a highly ordered and structured pattern. Entropy is a measure of the disorder or randomness in a system. Since the molecules in ice are highly ordered, the entropy of water at zero degrees Celsius is very low, approaching zero. Therefore, the correct answer is 0.Rate this question:
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- 8.
The largest unit of energy is?
- A.
Calorie
- B.
Joule
- C.
Volt
- D.
Watt
Correct Answer
A. CalorieExplanation
The calorie is the correct answer because it is the largest unit of energy. It is defined as the amount of energy required to raise the temperature of one gram of water by one degree Celsius. The joule, volt, and watt are also units of energy, but they are smaller than the calorie.Rate this question:
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- 9.
According to Kirchhoff's law, the factor affecting the heat of reaction is?
- A.
Temperature
- B.
Pressure
- C.
Mass
- D.
Volume
Correct Answer
A. TemperatureExplanation
According to Kirchhoff's law, the factor affecting the heat of reaction is temperature. This law states that the heat of reaction is directly proportional to the temperature change. As temperature increases, the heat of reaction also increases. This is because temperature affects the kinetic energy of the reactant molecules, leading to more collisions and increased reaction rates. Therefore, temperature plays a crucial role in determining the heat of reaction.Rate this question:
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- 10.
In a heat engine, what is the relationship between Qh, Qc and W
- A.
W = Qh + Qc
- B.
W = Qc - Qh
- C.
W = Qh - Qc
- D.
Q + Qh, + Qc = 0
Correct Answer
C. W = Qh - QcExplanation
Qh is turned into work and some heat is ejected
Therefore Qh = W + Qc
Hence w = Qh - QcRate this question:
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Current Version
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May 07, 2024Quiz Edited by
ProProfs Editorial Team
Expert Reviewed by
Matt Balanda -
Oct 09, 2013Quiz Created by
Gboulton
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