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BHU PMT BHU PMT (Mains) Solved Paper-2005

  • question_answer
    A clock hung on a wall has marks instead of numerals on its dial on the adjoining wall there is a plane mirror and the image of the clock in the mirror indicates the time 7:10. Then the time on the clock is:

    A)  7 : 10                    

    B)  4 : 50

    C)  5 : 40                    

    D)  10 : 7

    Correct Answer: B

    Solution :

                     In a plane mirror the image undergoes depth inversion hence, the time on the image is as much ahead of 12 h 0 min as the time on actual clock is behind 12 h 0 min. Time on the actual clock = 7h 10 m. Time on the image clock = (12 h and 0 min) - (7 h and 10 min) = 4 h and 50 min


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