Question

Which of the following does not work on the existence of atmospheric pressure ?
A. rise of iodine solution in the glass tube of dropper
B. rise of cold drink in a long plastic straw
C. sticking of suction hook on the wall of a room
D. rise of mercury in glass tube of thermometer

Answer 1

Answer:

d) rise of mercury in the glass tube of thermometer

Explanation:

The rise of mercury in the glass tube of a thermometer is due to rise in  temperature, not the existence of atmospheric pressure

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Answer 2

D. rise of mercury in glass tube of thermometer

Explanation:

In the existence of atmospheric pressure, rise of iodine solution in the glass tube of dropper, rise of cold drink in a long plastic straw and sticking of suction hook on the wall of a room will work. However, the rise in the level of mercury in glass tube of thermometer will not work due to the presence of atmospheric pressure. A thermometer works on the principle that mercury expands with increase in temperature. So the mercury in a glass tube of thermometer will rise only due to increase in temperature.

Option D is the answer.