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What are the materials that remain uncha...

What are the materials that remain unchanged over long periods of time?

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The materials that remain unchanged over long periods of time are empty medicine bottles, bubble packs, milk packets, broken plastic footwear.
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Knowledge Check

  • The quantity that remains unchanged in the output with respect to the input in an ideal transformer is ………..

    A
    frequency
    B
    current
    C
    voltage
    D
    none of these

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