Among the following the number of state variable is ____.
Internal energy (U)
Volume (V)
Heat (q)
Enthalpy (H)
Internal energy (U)
Volume (V)
Heat (q)
Enthalpy (H)
Answer: 3
Solution
State variables (or state functions) are properties that depend only on the current state of the system, not on the path taken to reach that state.
Therefore, 3 quantities (U, V, and H) are state variables.
- Internal energy (U): State variable — depends only on the current state
- Volume (V): State variable — depends only on the current state
- Heat (q): NOT a state variable — path-dependent (depends on the process)
- Enthalpy (H): State variable — defined as , depends only on state
Therefore, 3 quantities (U, V, and H) are state variables.
JEE Main · 2022 · 28 Jul 2022 · Shift 2 · Integer answer