The machine by which the atmospheric pressure is measured at any place, is-

Options

A. Hydrometer
B. Borometer
C. Sonometer
D. Voltmeter

Explanation

To solve the question "The machine by which the atmospheric pressure is measured at any place, is-", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question is asking for a specific instrument that is used to measure atmospheric pressure.

2. **Identify Relevant Instruments**: Think about the common instruments used in physics and meteorology to measure pressure. Some examples include:
- Barometer
- Manometer
- Sonometer
- Voltmeter

3. **Eliminate Incorrect Options**:
- **Sonometer**: This instrument is used to measure the tension, frequency, and density of vibrating strings, not atmospheric pressure.
- **Voltmeter**: This instrument measures electrical voltage, not atmospheric pressure.
- **Manometer**: While this can measure pressure, it is typically used for measuring the pressure of gases or liquids in a closed system, not specifically atmospheric pressure.

4. **Identify the Correct Instrument**: The instrument specifically designed to measure atmospheric pressure is the **Barometer**.

5. **Conclusion**: Therefore, the answer to the question is that the machine by which atmospheric pressure is measured at any place is a **Barometer**.

### Final Answer:
The machine by which the atmospheric pressure is measured at any place is a **Barometer**.

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