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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2013

  • question_answer
        Mercury boils at\[367{}^\circ C\]. However, mercury thermometers are made such that they can measure temperature upto\[500{}^\circ C\]. This is done by

    A)  maintaing vacuum above mercury column in the stem of the thermometer

    B)  filling nitrogen gas at high pressure above the mercury column

    C)  filling oxygen gas at high pressure above the mercury column

    D)  filling nitrogen gas at low pressure above the mercury column

    Correct Answer: B

    Solution :

                    If we fill nitrogen gas at high pressure above mercury level, the boiling point of mercury is increased which can extend the range upto\[500{}^\circ C\].


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