Physics-Screw Gauge
NEET Physics Screw Gauge MCQ Question
Type: MCQ-numerical-Hard-Class 12
A screw gauge has a least count of 0.01 mm and the zero error is noted as +0.02 mm. If a student measures the diameter of a wire and records the main scale reading as 5 mm and the circular scale reading as 25 divisions, what is the correct diameter of the wire?
A
5.25 mm
B
5.23 mm
C
5.27 mm
D
5.20 mm
Correct Answer
Option B
Detailed Explanation
The measured diameter is calculated as 5 mm + (25 x 0.01 mm) = 5.25 mm. After correcting for the zero error of +0.02 mm, the correct diameter is 5.25 mm - 0.02 mm = 5.23 mm.
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