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Per NCERT §5.2.1, for an ADIABATIC process (no heat exchange, q = 0), the first law reduces to which form?
AΔU = w_ad
BΔU = 0
CΔU = q
DΔU = pΔV
Answer & Solution
Correct answer: A. ΔU = w_ad
Per NCERT §5.2.1, adiabatic: q=0 → ΔU = w_ad. All energy change comes from work.
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