Question 1. 1. A thermodynamic system is provided with 50 joules of heat energy

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Question 1.1. A thermodynamic system is provided with 50 joules of heat energy and does 120 joules of work. What is the change in its internal energy? (Points : 1)       100 J
      50 J
      -70 J
      75 J

Question 2.2. When work is done by a system, its internal energy: (Points : 1)       Increases.
      Decreases.
      Remains the same.
      Becomes zero.

Question 3.3. 200 joules of work is done on a thermodynamic system and at the same time 140 joules of heat is given out by the system. What is the change in its internal energy?  (Points : 1)       200 J
      340 J
      60 J
      -60 J

Question 4.4. Which of the following is not a state variable? (Points : 1)       Internal energy
      Work
      Enthalpy
      Pressure

Question 5.5. Which of the following is an intensive variable? (Points : 1)       Mass
      Volume
      Boiling point
      Internal energy

Question 6.6. When a system absorbs heat from the surroundings, its internal energy: (Points : 1)       Increases.
      Decreases.
      Remains the same.
      Becomes zero.

Question 7.7. Which of the following is an extensive variable? (Points : 1)       Density
      Melting point
      Internal energy
      Pressure

Question 8.8. Which of the following is the mathematical form of the first law of thermodynamics? (Points : 1)       dE = q - w
      dE + q = w
      dE = q + w
      q - dE = w

Question 1.1. A thermodynamic system is provided with 50 joules of heat energy and does 120 joules of work. What is the change in its internal energy? (Points : 1)       100 J
      50 J
      -70 J
      75 J

Explanation / Answer

1. internal energy = Heat added to system - Work done by system. (delta U = Q - W)

internal energy = 50-120 = -70

ao answer is C -70 J

2.Decreases.

3.-200+140 = 60 J

4.Work

5.Mass

6.Increases

7.Pressure

8dE = q - w

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