Which of the following instruments is used for measuring gauge pressure?

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Thermometer

Barometer

Manometer

Hydrometer

answer is C.

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Detailed Solution

Concept: In this question we need to find out the device which is used to measure gauge pressure.
So, first of all thermometer is a device that is used to measure the temperature of any body. It is used by doctors and in Laboratories.
Barometer is an instrument that is used to measure atmospheric pressure.
Third is the manometer. It is an instrument through which we can measure the gas pressure or gauge pressure. It is in the shape of a U and by placing the source on one side and the substance of which we want to measure pressure on the other, we can measure the pressure of any substance.
Fourth is the hydrometer, it is used to measure the density of a liquid.
So out of the four options the manometer is the device which is used to measure the gauge pressure.
Hence, option 3 is correct.

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