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Which of the following is not used to reduce frictiona)making scratches on the contact surfacesb)using oil between contact surfacesc)using ball bearingd)using grease between contact surfacesCorrect answer is option 'A'. Can you explain this answer? for Class 9 2024 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about Which of the following is not used to reduce frictiona)making scratches on the contact surfacesb)using oil between contact surfacesc)using ball bearingd)using grease between contact surfacesCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 9 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following is not used to reduce frictiona)making scratches on the contact surfacesb)using oil between contact surfacesc)using ball bearingd)using grease between contact surfacesCorrect answer is option 'A'. Can you explain this answer?.

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