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    Question

    Which of the following statements is NOT correct about

    surface tension?
    A Surface tension is typically measured in dynes/cm. Correct Answer Incorrect Answer
    B The shape of water drop is spherical due to surface tension, Correct Answer Incorrect Answer
    C At room temperature, surface tension of water is less than ethyl alcohol. Correct Answer Incorrect Answer
    D The cohesive forces between liquid molecules are responsible for the phenomenon known as surface tension, Correct Answer Incorrect Answer

    Solution

    Statement 3 is incorrect. At room temperature, the surface tension of water is actually higher than that of ethyl alcohol. For example, water at 20°C has a surface tension of 72.8 dynes/cm, while that for ethyl alcohol is 22.3 dynes/cm.

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