UPSC General Studies Sample Paper General Studies Sample Paper-2

  • question_answer
    With reference to properties of lava, consider the following statements.
    1. Basic lavas are the hottest lavas and are highly fluid.
    2. When basic lava flows from a volcano it is very explosive.
    3. Acid lavas are highly viscous and cause less explosive volcanoes.
    4. Acid lava are also called as felsic lava.
    Which of the statements given above are correct?

    A)  1 and 4           

    B)  2 and 3           

    C)  1, 2 and 4        

    D)  3 and 4

    Correct Answer: A

    Solution :

    [a] Lava is the molten rock expelled by a volcano during an eruption and the resulting rock after solidification and cooling. The source of the heat that liquifies the rock with in the Earth is geothermal energy. Up to 100000 times as viscous as water, lava can flow great distances before cooling and solidifying because of its thixotropic and shear thinking properties.

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