During an isochoric process

Options

A. V remains constant
B. T remains constant
C. Q remains constant
D. P remains constant

Answer

### Step-by-Step Solution:

1. **Understanding the Isochoric Process**:
- An isochoric process is defined as a thermodynamic process in which the volume of the system remains constant. This means that there is no change in volume (ΔV = 0).

2. **Analyzing the Options**:
- We are given four options to evaluate:
1. V remains constant
2. T remains constant
3. Q remains constant
4. P remains constant

3. **Evaluating Each Option**:
- **Option 1: V remains constant**:
- Since by definition of an isochoric process, the volume does not change, this statement is true.
- **Option 2: T remains constant**:
- This is incorrect. In an isochoric process, temperature can change as the internal energy of the system can change due to heat transfer.
- **Option 3: Q remains constant**:
- This is also incorrect. The heat transfer (Q) can vary during an isochoric process as the system may absorb or release heat.
- **Option 4: P remains constant**:
- This is incorrect as well. The pressure of the system can change during an isochoric process depending on the temperature and the amount of heat added or removed.

4. **Conclusion**:
- The only correct statement regarding an isochoric process is that the volume remains constant. Therefore, the correct answer is **Option 1: V remains constant**.