A device whose one end is connected to `-ve` terminal and other end connected to `+ve` terminal. If both ends are interchanged with suppy then current is not flowing then device will be-

Options

A. P–N Junction
B. Transistor
C. Zener diode
D. Triode

Answer

To solve the problem, we need to analyze the behavior of the device when the terminals are connected to a power supply and when they are interchanged.

### Step-by-Step Solution:

1. **Understanding the Device Connection**:
- The device is connected with one end to the negative terminal and the other end to the positive terminal of a power supply. This configuration suggests that the device is being powered in a certain direction.

2. **Interchanging the Terminals**:
- When we interchange the terminals, the end that was previously connected to the negative terminal is now connected to the positive terminal, and vice versa.

3. **Current Flow Analysis**:
- The question states that when the terminals are interchanged, the current does not flow through the device. This is a crucial point in identifying the type of device.

4. **Identifying the Device**:
- We can analyze various types of devices:
- **PN Junction Diode**: In forward bias (initial connection), it allows current to flow. In reverse bias (after interchanging), it blocks current flow. This matches our condition.
- **Transistor**: A transistor has three terminals and cannot be described by just two connections. Thus, it cannot be the answer.
- **Triode**: Similar to a transistor, a triode has three terminals and is not applicable here.
- **Zener Diode**: A Zener diode allows current to flow even in reverse bias, which contradicts our condition.

5. **Conclusion**:
- The only device that fits the criteria of allowing current to flow in one configuration and blocking it in the other is the **PN Junction Diode**. Therefore, the answer is that the device is a PN Junction Diode.

### Final Answer:
The device is a **PN Junction Diode**.