Correct Answer - Option 4 : B
The correct answer is Barometer.
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The barometer is used to measure atmospheric pressure.
- A barometer is a scientific instrument used to measure atmospheric pressure, also called barometric pressure.
- A simple barometer consists of a long glass tube (closed at one end, open at the other) filled with mercury and turned upside down into a container of mercury.
- The barometer works by balancing the mercury in the glass tube against the outside air pressure, just like a set of scales.
Hence, option 4 is correct.
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lactometer
- An instrument used in measuring the volume of cream in a sample of milk, and the probable amount of water, if any, which has been added to it.
- A Thermometer is a device that measures temperature or a temperature gradient (the degree of hotness or coldness of an object).
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A thermometer has two important elements:
- Temperature sensor
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Some means of converting this change into a numerical value.
- A Multimeter, also known as a VOM (volt-ohm-milliammeter), is an electronic measuring instrument that combines several measurement functions in one unit.
- A typical multimeter can measure voltage, current, and resistance.
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Analog multimeters use a microammeter with a moving pointer to display readings.
- Digital multimeters (DMM, DVOM) have a numeric display, and may also show a graphical bar representing the measured value.
