Q.

A beaker containing water is heated over flame to determine the boiling point of water.


What would be the effect on temperature?


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a

Keeps on increasing irregularly

b

Keeps on increasing regularly

c

First increases gradually and then become constant  

d

First increase slowly, then decreases rapidly and eventually becomes constant

answer is D.

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Detailed Solution

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When a beaker containing water is heated over flame to determine the boiling point of water, the temperature first increases gradually and then become constant
When a beaker containing water is heated over flame, first its temperature increases continuously until it starts boiling, after the temperature reaches the boiling point of water, it becomes constant. After reaching the boiling point, the water starts evaporating and hence the temperature does not change.
 
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