Which one of the following is dimensionless physical quantity?
A
Angle
B
Stress
C
Force gradient
D
Velocity gradient
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A
Angle
a (a)
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If the screw on a screw-gauge is given six rotations, it moves by $3\; \mathrm{mm}$ on the main scale. If there are $50$ divisions on the circular scale the least count of the screw gauge is
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