CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2004

  • question_answer H-polaroid is prepared by:

    A)  orienting herapathite crystal in the same direction in nitrocellulose

    B)  using thin tourmaline crystals

    C)  stretching polyvinyl alcohol and then  heated with dehydrating agent

    D)  stretching polyvinyl alcohol and then impregnating with iodine

    Correct Answer: D

    Solution :

    When a thin sheet of polyvinyl alcohol is stretched and then impregnating with iodine, H-polaroid is obtained.


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