In an isothermal process for an ideal gas:
AΔT = 0
BΔP = 0
CΔV = 0
DΔU = ΔQ
Answer & Solution
Correct answer: A. ΔT = 0
1. 'Isothermal' literally means at constant temperature: ΔT = 0.
2. Since U depends only on T for an ideal gas, ΔU = 0 in an isothermal process.
3. First law then gives Q = W (heat absorbed equals work done).
_Source: NCERT Class 11 Physics Ch 11, §11.7 Thermodynamic Processes_
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