Which of the following is not an application of ultrasound

Used to kill bacteria in liquids

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Used to find faults and cracks in metals

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Used in metal refining

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Solution

The correct option is C Used in metal refining
Ultrasound has no use in metal refining. But it is used to kill bacteria in liquids. Thus the liquid can be preserved for a long time. Ultrasound is thrown on metal under investigation for any sort of cracks or faults.

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