Physics Measuring Instruments

An ammeter is an instrument used for measuring electric current in amperes.

In TEM, samples are placed in vacuum.

Root pressure is the positive pressure that develops in the roots of plants due to the active absorption of mineral nutrients. A manometer is the standard instrument used to measure this pressure.

To convert a galvanometer into an ammeter, a very low resistance (shunt) must be connected in parallel with it. This allows most of the current to bypass the galvanometer, preventing damage and increasing the range.

To convert a galvanometer into an ammeter, a very low resistance, known as a shunt, must be connected in parallel with the galvanometer coil to bypass most of the current.

Liquid thermometers depend on the thermal expansion of liquids such as mercury, alcohol etc. The commonly used liquid thermometer is mercury thermometer which uses mercury as the thermometric liquid. The thermometer consists of a cylindrical glass bulb containing mercury to which a graduated capillary tube of uniform bore is attached. The change in temperature is shown by the apparent expansion of mercury in glass and the resulting movement of the mercury meniscus in the system of the thermometer.As mercury freezes at -38.8 ⁰C and boils at 356⁰ C, the mercury thermometer can not be used for very low or very high temperature measurements. A mercury thermometer can be used to measure temperatures up to 300⁰C

This is the correct option. Voltmeter is used to measure potential difference between two known points in an electric circuit.

This is the correct option. A galvanometer is used for detecting the flow of an electric current in a circuit.

All are measuring instruments, except diameter.

A hygrometer is the standard instrument used to measure the humidity or moisture content in the air. A thermometer measures temperature, and a barometer measures atmospheric pressure.

A thermometer is used to measure temperature.

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Ans - 3

Hygrometer