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  1. When the bubble of a level tube was moved by 10 divisions, the change in staff intercept was 0.05 m. If the distance between the staff and the instrument was 100 m, then the senstitiveness of the bubble tube is given by

    2. A.
    1.03 sec of arc
    B.
    10.3 sec of arc
    C.
    20.6 sec of arc
    D.
    103 sec of arc

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    Answer : Option A

    Explanation :

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