NEET Physics Screw Gauge MCQ Question
A screw gauge is used to measure the diameter of a wire by inserting it between the screw and the stud and rotating the rachet until a click sound is heard. Which of the following steps is crucial to ensure the accuracy of the diameter measurement?
Rotate the wire by 90° and take a second reading.
Ensure the rachet is rotated three times.
Use a lubricant on the screw to reduce friction.
Measure the wire's length before measuring its diameter.
Correct Answer
Detailed Explanation
According to the context, measuring the diameter of the wire at two positions at right angles ensures accuracy, especially if the wire is not perfectly circular.
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