Important Scientific (125) MCQs with Answers

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A Geiger counter is a device used to detect and measure radiation (ionizing radiation such as alpha, beta, and gamma rays).

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Mercury is the liquid used in a clinical thermometer because it expands uniformly with temperature and is easily visible in the glass capillary.

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The Vernier Caliper is the suitable instrument for measuring the internal diameter of a test tube because its internal jaws can accurately measure internal dimensions.

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The practical use of a thermocouple is mainly in instruments, particularly for temperature measurement and control.

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A stopwatch that can measure as small as 1/100 second is called a digital stopwatch.

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A bolometer is used to measure heat radiation (infrared radiation) by detecting the temperature change in a material when it absorbs radiant energy.

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Hay Bridge is used for the measurement of inductance, particularly for coils with high Q-factor.

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Mercury is the metal used in thermometers and barometers because it is liquid at room temperature and expands uniformly with temperature changes.

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A stopwatch that can measure time intervals up to a minimum of 0.1 second is called a mechanical stopwatch.

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In a gas meter, a gear is attached to the wheel that displays the volume of gas consumed on the dial.