Thermodynamics - Result Question 5

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5. The internal energy change in a system that has absorbed 2 kcals of heat and done $500 J$ of work is:

======= ####5. The internal energy change in a system that has absorbed 2 kcals of heat and done $500 J$ of work is:

3e0f7ab6f6a50373c3f2dbda6ca2533482a77bed:content/english/neet-pyq-chapterwise/physics/thermodynamics/thermodynamics—result-question-5.md (a) $6400 J$

(b) $5400 J$

(c) $7900 J$

(d) $8900 J$

[2009]

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Answer:

Correct Answer: 5. (c)

Solution:

  1. (c) According to first law of thermodynamics

$Q=\Delta U+W$

$\Delta U=Q-W$

$=2 \times 4.2 \times 1000-500=8400-500$

$=7900 J$