NDA 2026
- Exam
- NDA
- Year
- 2026
- Subject
- General Ability
- Chapter
- General Science
NDA 2026 · General Ability · General Science
In a certain process, the relation between pressure (P) and volume...
In a certain process, the relation between pressure and volume , for an ideal gas, is given by . If the initial temperature is and the final temperature is ; and the initial volume is and the final volume is , then which one of the following is correct?
Options
- A
- B
- C
- D
Correct answer
C.
Step-by-step solution
The given process equation is .
For an ideal gas, the equation of state is , which gives .
Substituting the expression for into the process equation:
\left(\dfrac{nRT}{V}\right) V^2 = \text{constant}T V = \dfrac{\text{constant}}{nR} = \text{constant}T_1 V_1 = T_2 V_2\dfrac{T_1}{T_2} = \dfrac{V_2}{V_1}\dfrac{T_1}{T_2} = \dfrac{V_2}{V_1}
For an ideal gas, the equation of state is , which gives .
Substituting the expression for into the process equation:
\left(\dfrac{nRT}{V}\right) V^2 = \text{constant}T V = \dfrac{\text{constant}}{nR} = \text{constant}T_1 V_1 = T_2 V_2\dfrac{T_1}{T_2} = \dfrac{V_2}{V_1}\dfrac{T_1}{T_2} = \dfrac{V_2}{V_1}