A modified discharge tube is used as a ________ .

cathode ray oscilloscope

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fluorescent tube

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x-ray tube

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all the above

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Solution

The correct option is D all the above
A discharge tube is a tube containing charged electrodes and filled with a gas in which ionization is induced by an electric filed. X-ray tube, fluroscent tube and cathode rays oscilloscope can be used as a modified discharge tube in which these tubes contain charged electrodes and filled with a gas.

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