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AIEEE 2009 Solved Paper
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© examsnet.com
Question : 30
Total: 89
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
Validate
Solution:
30 vernier scale divisions coincide with 29 main scale divisions.
Therefore 1 V.S.D
=
29
30
M.S.D
Least count
=
1
M.S.D
−
1
V.S.D
=
1
M.S.D
−
29
30
M.S.D
=
1
30
M
.
S
.
D
=
1
30
×
0.5
∘
=
1
30
×
1
2
∘
=
1
60
∘
=
1
min
© examsnet.com
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