An ideal thermometer should have

Small heat capacity

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Large heat capacity

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Medium heat capacity

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Variable heat capacity

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Solution

The correct option is A Small heat capacity
A thermometer has to attain the temperature of the body fast. So it should draw as little heat from the body as possible so that the existing temperature of the body is not disturbed appreciably. Therefore, the heat capacity of an ideal thermometer should be as much small as possible.

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