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GATE 2016 ME (ME1) – Question 26

Thermodynamics · Zeroth, first and second laws, work, heat and energy changes · 1 mark · Multiple choice

Which of the following statements are TRUE with respect to heat and work? (i) They are boundary phenomena (ii) They are exact differentials (iii) They are path functions

  1. both (i) and (ii)
  2. both (i) and (iii)
  3. both (ii) and (iii)
  4. only (iii)

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Show answer and explanation

Correct answer: (B) both (i) and (iii)

Explanation

Heat and work describe energy transfer across a system boundary during a process. Their values depend on the path, so their differentials are inexact rather than exact state-property differentials. Statements I and III are true and II false. Hence **B**.