Question

Gauge pressure is measured with which of the below instruments?

• A. Manometer
• B. Barometer
• C. Hydrometer
• D. Thermometer

Answer 1

The correct option is A

Manometer

Explanation for the correct option:

In the case of option A,

1. A manometer is a device used to measure gauge pressure.
2. It is a U-shaped tube whose one end is connected to the source of pressure which is to be measured and the other end is open to the atmosphere.
3. It measures the source's pressure in relation to the atmospheric pressure.

Explanation for the incorrect options:

In the case of option B,

1. A barometer is an instrument that measures air pressure in a specific environment.
2. This device is used for forecasting the weather and determining altitude.
3. It measures atmospheric pressure in terms of atmosphere or bars.

In the case of option C,

1. A hydrometer is a device that measures the density or relative density of liquids using the concept of buoyancy.
2. The hydrometer works on the concept of buoyancy.
3. The upward force exerted by a fluid on an immersed object in a gravity field is called buoyancy.

In the case of option D,

1. A thermometer is a device used to measure temperature.
2. It typically consists of a narrow glass tube containing a thin column of a liquid that rises and falls in response to temperature changes.

Hence, option A is the correct answer.