In an experiment the angles are required to be measured using an instrument. 29 divisions of the main scale exactly coincide with the 30 divisions of the vernier scale. If the smallest division of the main scale is half-a-degree (= 0.5°), then the least count of the instrument is
one minute
half minute
one degree
half degree
As we learnt in
To measure the diameter of small spherical cylindrical body using Vernier Callipers -
Vernier Constant
= 1 Main scale division - 1 V.S. Division
V.C= 1 M.S.D - 1 V.S.D
M.S.D= Main Scale Reading
V.S.D= Vernier Scale Reading
- wherein
Total observed reading =
N= Nth division
Observations:
1. Vernier constant (least count) of the Vernier Callipers:
1 M.S.D. = 1 mm
10 vernier scale divisions = 9 main scale divisions
i.e. 10 V.S.D. = 9 M.S.D.
1 V.S.D. = M.S.D.
Vernier Constant (L.C.) = 1 M.S.D. - 1 V.S.D. = 1 M.S.D. M.S.D.
2. Zero error: (i) ........ cm (ii) ............cm (iii) ..........cm
Mean Zero Error (e) = ............ cm
Mean Zero Correction (c) = - (Mean Zero Error)
= .......... cm
V.S.D. = M.S.D.
Least count = 1 M.S.D. - 1 V.S.D.
Option 1)
one minute
Correct
Option 2)
half minute
Incorrect
Option 3)
one degree
Incorrect
Option 4)
half degree
Incorrect
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