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JEE Main 17 March 2021 Shift 1 Solved Paper
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© examsnet.com
Question : 7
Total: 90
The vernier scale used for measurement has a positive zero error of
0.2
m
m
. If while taking a measurement, it was noted that ' 0 ' on the vernier scale lies between
8.5
c
m
and
8.6
c
m
, vernier coincidence is 6 , then the correct value of measurement is .........
c
m
.
[17 Mar 2021 Shift 1]
8.36
8.54
8.58
8.56
Validate
Solution:
Given, positive zero error
=
0.2
m
m
=
0.02
c
m
[
∴
Least count
L
C
=
0.01
c
m
]
Main scale reading
=
8.5
c
m
Vernier scale reading
=
Vernier scale coincidence
×
Least count
=
6
×
0.01
=
0.06
c
m
Final reading
=
Main scale reading
+
Vernier scale reading - Zero error
=
8.5
+
0.06
−
0.02
=
8.54
c
m
© examsnet.com
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