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JEE Main & Advanced JEE Main Solved Paper-2014

  • question_answer
    5. A student measured the length of a rod and wrote it as 3.50 cm. Which instrument did he use to measure it ? JEE Main  Solved  Paper-2014

    A) A screw gauge having 100 divisions in the circular scale and pitch as 1 mm.

    B) A screw gauge having 50 divisions in the circular scale and pitch as 1 mm.

    C) A meter scale.

    D) A verniercalliper where the 10 divisions in vernier scale matches with 9 division in main scale &main scale has 10 divisions in 1 cm.

    Correct Answer: D

    Solution :

    Least count = 0.01 cmi.e. 0.1 mm For verniercalliper of10 v.s.d. = 9 M.s. d. 1 v.s.d. = 0.9 M.s.d. L.C. = 1 M.s.d = (0.1) M.s.d. 1 v.s.d. = 0.1 cm \[\Rightarrow \]L.c = 0.01 cm


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