For plotting temperature-time graph for a hot body, as it cools to room temperature, a student is to choose one each from each of the following pairs.
A : Calorimeter
(i) blackened from outside
(ii) polished from outside

B : Base for keeping the calorimeter
(i) insulated
(ii) metallic
In order to get the correct graph he should prefer to choose :
(1) A (i), B (ii)
(2) A (ii), B (ii)
(3) A (i) , B (i)
(4) A (ii), B (i)

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Solution

For plotting temperature-time graph for a hot body, the student needs to choose a calorimeter which is blackened from outside as it would absorb more heat and the temperature change could be observed more accurately, also the base for keeping the calorie meter should be insulated so that the temperature of the surface where it is put does not interfere with the experiment readings.

Hence, the correct answer is option 3.

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