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     EduGorilla 
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    In Lissajous method of frequency measurement:

    I. Unknown signal waveform is fed into vertical input of the scope
    II. Known signal waveform is fed into horizontal input of the scope
    III. Unknown signal waveform is fixed and known signal is varied
    IV. Unknown signal waveform is varied and known signal is fixed

    Which among the above are correct?

    Options :-

    1. Both (I) and (II)
    2. Both (II) and (III)
    3. Both (III) and (IV)
    4. Both (I) and (IV)
    5. #
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