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      Question

      Which statement about Cathode Rays is incorrect ?

      A They travel in straight lines Correct Answer Incorrect Answer
      B They produce fluorescence Correct Answer Incorrect Answer
      C They can penetrate thin metal foils Correct Answer Incorrect Answer
      D They are deflected by both electric and magnetic fields Correct Answer Incorrect Answer

      Solution

      The incorrect statement is that cathode rays travel in straight lines; while they generally do, they can be deflected by electric and magnetic fields, indicating that they do not always travel straight.

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