NDA 2026
- Exam
- NDA
- Year
- 2026
- Subject
- General Ability
- Chapter
- General Science
NDA 2026 · General Ability · General Science
For an ideal gas, a process is described by P = kT , where k is a...
For an ideal gas, a process is described by , where is a constant. If the molar heat capacity for this process is , then which one of the following is correct (where the symbols have their usual meanings)?
Options
- A
- B
- C
- D is never constant
Correct answer
B.
Step-by-step solution
The ideal gas equation for moles is .
Given the process equation , where is a constant.
Substituting into the ideal gas equation, we get:
Since , , and are constants, the volume is constant. Thus, the process is isochoric.
For an isochoric process, the work done .
From the first law of thermodynamics, .
Since and , we have:
Answer:
Given the process equation , where is a constant.
Substituting into the ideal gas equation, we get:
Since , , and are constants, the volume is constant. Thus, the process is isochoric.
For an isochoric process, the work done .
From the first law of thermodynamics, .
Since and , we have:
Answer: