Question

Match the statements in List I with their correct answers in List II, respectively, in respect to modified 1st law of thermodynamics, and

List I		List II
A	Constant heat (q = 0)	I	Isothermal
B	Reversible process at constant temperature (dT = 0)	II	Isometric
C	Constant volume (dV = 0)	III	Adiabatic
D	Constant pressure (dP = 0)	IV	Isobar

Choose the correct answer from the options given below:

• A. A ‐ II, B ‐ I, C ‐ III, D ‐ IV
• B. A ‐ I, B ‐ III, C ‐ II, D ‐ IV
• C. A ‐ III, B ‐ I, C ‐ II, D ‐ IV
• D. A ‐ IV, B ‐ I, C ‐ II, D ‐ III

Answer 1

The Correct Option is C

To solve this matching question related to the modified 1st law of thermodynamics, we need to pair each description from List I with the correct term in List II. Let's analyze each option:

1. Constant heat (q = 0):
   This describes an adiabatic process, where no heat is exchanged with the surroundings. Therefore, the correct match is III. Adiabatic.
2. Reversible process at constant temperature (dT = 0):
   A process that occurs at constant temperature is known as an isothermal process. The correct match is I. Isothermal.
3. Constant volume (dV = 0):
   A process occurring at constant volume is termed as isometric or isochoric. Hence, the match is II. Isometric.
4. Constant pressure (dP = 0):
   A process at constant pressure is called an isobaric process. Therefore, the match is IV. Isobar.

Based on the above analysis, the correct matching is:

A ‐ III, B ‐ I, C ‐ II, D ‐ IV

This matches with the provided correct answer.