Multiple choice general knowledge science & technology

First Law of Thermodynamics where U1-2-->Change in internal energy,Q-->heat added,W-->work done

  1. U1-2 = W + Q

  2. W = Q + U1-2

  3. Q = U1-2 + W

  4. Q = U1-2 -W
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The First Law of Thermodynamics states energy is conserved: heat added to a system equals its change in internal energy plus work done BY the system. Option C correctly expresses this as Q = ΔU + W, where W represents work output. Options A and B incorrectly arrange terms, while D would only be valid if W represented work done ON the system (opposite sign convention).

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