| Date | May 2013 | Marks available | 1 | Reference code | 13M.1.HL.TZ1.9 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 9 | Adapted from | N/A |
Question
Which of the following statements is consistent with the second law of thermodynamics?
A. Thermal energy can ow by itself from a cold to a hot body.
B. A heat engine can be 100 % ef cient.
C. In natural processes, total entropy tends to increase.
D. The entropy in every closed system is constant.
Markscheme
C
Examiners report
[N/A]
Syllabus sections
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