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An hourglass ...

Question

An hourglass or a sandglass comprises of two identical glass bulbs connected vertically by a narrow neck. It is used to measure

A

Length

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B

Mass

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C

Amount of sand

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D

Time

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Solution

The correct option is D
Time

An hourglass is a device used to measure the passage of time. The narrow neck, which connects the two glass bulbs, allows a regulated trickle of material (generally sand) from the upper bulb to the lower one.

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