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Q.

Two thermometers are constructed in the same way except that, one has a spherical bulb and the other a  cylindrical bulb. Which one will respond quicker to temperature change ?

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a

spherical bulb thermometer

b

cylindrical bulb thermometer

c

both equally

d

either of any option

answer is B.

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Detailed Solution

For a given volume, a cylinder has more surface area than a sphere. As rate of heat conduction is proportional to surface area, the thermometer with cylindrical bulbresponds more quickly.
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