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Twelfth Grade (Grade 12) Thermodynamics Questions

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Grade 12 Thermodynamics
According to second law of thermodynamics, heat energy cannot be completely converted into useful work owing to
  1. the entropy of the system
  2. the enthalpy of the system
  3. the internal energy of the system
  4. the translational energy of the system
Grade 12 Thermodynamics
Grade 12 Thermodynamics
Which of the following equations is used to represent the First Law of Thermodynamics for a closed system, according to the IUPAC convention?
  1. [math]DeltaU=Q+W[/math]
  2. [math]DeltaU=W-Q[/math]
  3. [math]DeltaU=Q-W[/math]
  4. [math]DeltaU=Q+2W[/math]
Grade 12 Thermodynamics
If [math]DeltaS[/math] denotes entropy change, then what is the entropy change for a reversible adiabatic process?
  1. [math]DeltaS = 0[/math]
  2. [math]DeltaS = 1[/math]
  3. [math]Delta S < 1[/math]
  4. [math]DeltaS >1[/math]
Grade 12 Thermodynamics
Which of the following is an example of spontaneous processes?
  1. Electrolysis
  2. Combustion
  3. Photosynthesis
  4. The rusting of iron
Grade 12 Thermodynamics
Grade 12 Thermodynamics
Grade 12 Thermodynamics
Grade 12 Thermodynamics
Grade 12 Thermodynamics
Which of the following expressions correctly characterizes an isolated system?
  1. [math]∆U<0[/math]
  2. [math]∆U=0[/math]
  3. [math]∆U>0[/math]
  4. None of the above
Grade 12 Thermodynamics
Which of the following expressions provides the correct conversion for Joules and Calories?
  1. 1 Joule (J) = 0.239 Cal
  2. 1 Joule (J) = 0.547 Cal
  3. 1 Joule (J) = 0.345 Cal
  4. 1 Joule (J) = 0.451 Cal
Grade 12 Thermodynamics
In which of the following cases would [math]∆U[/math] in [math]∆U=Q+W[/math] be less than zero?
  1. Work is done on the system
  2. Work is done by the system
  3. The magnitudes of heat and work are equivalent
  4. The magnitude of heat is greater than that of the work
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