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The Indian army uses which of the following thermometer in Siachen?

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Mercury thermometer because Mercury is shiny.

Alcohol thermometer because it is colored

Alcohol thermometer because its freezing point is higher than Mercury.

Alcohol thermometer because its freezing point is lower than Mercury.

answer is D.

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Detailed Solution

The Indian army uses an alcohol thermometer in Siachen.
An alcohol thermometer is used in extremely cold regions because its freezing point is

- 115 ° C

, which is very low compared to the freezing point of mercury (

- 38 ° C

). Thus mercury thermometer will not work in Siachen and hence the alcohol thermometer because its freezing point is lower than mercury.

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