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The magnetic tape is generally a plastic ribbon coated with ______

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The magnetic tape is generally a plastic ribbon coated with ______

(a) Magnesium oxide

(b) Chromium dioxide

(c) Zinc oxide

(d) Copper oxide

This question was posed to me in an online quiz.

My enquiry is from Magnetic Tapes topic in portion Secondary Storage Devices of Computer Fundamentals

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Right answer is (b) Chromium dioxide

The explanation: Plastic ribbon is coated with a magnetizable recording material. Iron oxide and chromium dioxide is generally used in magnetic tapes. Data are recorded on the tape in the form of tiny invisible dots.

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