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The MCQs below are drawn from the Physics subject category.
Showing 261–270
of 15721 MCQs
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261
Which instrument is used to measure the quantity of rainfall?
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Explanation
A rain gauge is the instrument used to measure the amount (quantity) of rainfall.
262
Density of milk is measured by __.
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Explanation
A lactometer is used to measure the density (specific gravity) of milk.
263
Thermistor is a sensor for
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Explanation
A thermistor is a temperature-sensitive resistor used to measure temperature.
264
A clinical thermometer has a narrow capillary tube so that it
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Explanation
A narrow capillary and constriction allow the mercury to stay put so the thermometer records the maximum temperature reached.
265
A sudden fall in the barometric reading indicates
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Explanation
A falling barometer generally signals deteriorating weather, commonly associated with rain.
266
The best instrument used for the measurement of emf of a cell is
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Explanation
A potentiometer measures emf of a cell without drawing current from it, giving the most accurate measurement of emf.
267
The minimum temperature that can be measured with a mercury thermometer is
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Explanation
Mercury freezes at about -39°C, so mercury thermometers cannot measure lower temperatures accurately.
268
Centrifuge is an instrument used
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Explanation
A centrifuge separates components of mixtures (e.g., solids from liquids) using centrifugal force.
269
Atmospheric pressure is measured by
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Explanation
A barometer is the instrument used to measure atmospheric pressure.
270
Who developed the world's first vacuum pump in 1650?
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Explanation
Otto von Guericke is known for developing an early vacuum pump in the 17th century, making him the correct inventor.
