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NEET Sample Paper NEET Sample Test Paper-7

  • question_answer
    The pitch of a screw gauge is 1mm and there are 100 divisions on its circular scale. When nothing is put in between its jaws, the zero of the circular scale lies 4 divisions below the reference line when a steel wire is placed between the jaws, two main scale divisioins are clearly visible and 67 divisions on the circular scale are observed. The diameter of the wire is:

    A)  \[2.71\,mm\]               

    B)  \[2.67\,mm\]

    C)  \[2.63\,mm\]               

    D)  \[2.65\,mm\]

    Correct Answer: C

    Solution :

    Given,     \[P=1mm,\,N=100\] \[\Rightarrow \] Least count,    \[C=\frac{P}{N}=\frac{1mm}{100}=0.01mm\] The instrument has a positive zero error i.e.,  \[e=+NC=+4\times 0.01=+0.04mm\] Main scale reading is \[2\times (1mm)=2mm\] Circular scale reading is \[67(0.01)=0.67mm\] observed reading is \[{{R}_{0}}=2+0.67=2.67mm\] So, true reading \[={{R}_{0}}-e=2.62mm\]


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