B.4 Thermodynamics Quiz
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5 questions, one answer each
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1. A gas is compressed with no heat transfer. The process is:
- A. Isothermal
- B. Isobaric
- C. Adiabatic
- D. Isovolumetric
2. A gas does 200 J of work and absorbs 500 J of heat. Its internal energy changes by:
- A. +700 J
- B. +300 J
- C. −300 J
- D. −700 J
3. 600 J is transferred as heat to a reservoir at 300 K. Its entropy change is:
- A. +2.0 J K⁻¹
- B. −2.0 J K⁻¹
- C. +0.50 J K⁻¹
- D. +1.8 × 10⁵ J K⁻¹
4. The maximum efficiency of an engine operating between 600 K and 300 K is:
- A. 25%
- B. 50%
- C. 67%
- D. 100%
5. In an isovolumetric process, the work done by the gas is:
- A. PΔV > 0
- B. Equal to Q
- C. Zero
- D. Equal to −ΔU