SSC General Science & Technology Sample Paper NCERT Sample Paper-2

  • question_answer
    When a certain mass of liquid is heated in a glass flask?

    A)  The liquid level starts rising at once

    B)  The density of the liquid increases

    C)  The density of the liquid remains unchanged

    D)  The liquid level falls at first and then starts rising

    Correct Answer: D

    Solution :

    [d] Glass is a bad conductor of heat, so at first the glass flask expands and its volume inside increases. The liquid which has not started to expand yet, drops to fill the extra volume inside the flask. Once heat reaches the liquid it, expands rapidly up the tube and over the top.

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