The bulb of a thermometer is spherical and that of another is cylindrical. Equal quantity of mercury is filled in them. Then

thermometer with spherical bulb will respond quickly.

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thermometer with cylindrical bulb will respond slowly.

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thermometer with spherical bulb will respond slowly.

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thermometer with cylindrical bulb will respond quickly.

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Solution

The correct option is D thermometer with cylindrical bulb will respond quickly.
The cross section of a cylinder is constant radius circle, whereas that of sphere is variable radius circle. Due to this, rise in mercury slows down towards the middle part of the sphere, whereas in case of cylinder, it is constant as it has more area.

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