Q. A screw gauge gives the following readings when used to measure the diameter of a wire Main scale reading : 0 mm Circular scale reading : 52 divisions Given that 1 mm on main scale corresponds to 100 divisions on the circular scale. The diameter of the wire from the above data is:

A) 0.026 cm
B) 0.26 cm
C) 0.052 cm
D) 0.52 cm
Explanation

[Solution] Least count = 1/100 mm = 0.01 mm. Diameter = 0 + 52 × 0.01 = 0.52 mm = 0.052 cm. Answer (3).

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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