2nd Law Thermodynamics And Entropy Quiz

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2nd Law Thermodynamics And Entropy Quiz - Quiz

The study of the relationships between heat, work, temperature, and energy is known as thermodynamics. The quiz on 2nd law of thermodynamics and entropy is designed to test your knowledge of the subject. The quiz contains questions that will help you solidify your conceptual understanding. Take the quiz and see how well you know heat energy and its conversion into mechanical energy. If you like the quiz, do share it with your friends and family. All the best!


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 happen
    Explanation
    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.

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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 system
    Explanation
    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.

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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 elsewhere
    Explanation
    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.

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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 unity
    Explanation
    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".

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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 above
    Explanation
    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.

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  • 6. 

    Chemical dissociation is always?

    • A.

      Exothermic

    • B.

      Endothermic

    • C.

      Reversible

    • D.

      Endothermic and reversible

    Correct Answer
    A. Exothermic
    Explanation
    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.

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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. 0
    Explanation
    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.

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  • 8. 

    The largest unit of energy is?

    • A.

      Calorie

    • B.

      Joule

    • C.

      Volt

    • D.

      Watt

    Correct Answer
    A. Calorie
    Explanation
    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.

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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. Temperature
    Explanation
    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.

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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 - Qc
    Explanation
    Qh is turned into work and some heat is ejected
    Therefore Qh = W + Qc
    Hence w = Qh - Qc

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