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

  • question_answer
    The substance coated on plastic tape-recorder tapes is

    A)  Zinc oxide        

    B)  magnesium oxide

    C)  Iron sulphate    

    D)  iron oxide

    Correct Answer: D

    Solution :

    [d] tape recorder records information on strips of plastic tape (usually polyester) that are coated with fine particles of a magnetic substance, usually an oxide of iron, cobalt, or chromium. The coating is normally held on the tape with a special binder.

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