NCERT Exercise 1.8 - Units and Measurements
Question: Answer the following: (a) You are given a thread and a metre scale. How will you estimate the diameter of the thread? (b) A screw gauge has a pitch of 1.0 mm and 200 divisions on the circular scale. Do you think it is possible to increase the accuracy of the screw gauge arbitrarily by increasing the number of divisions on the circular scale? (c) The mean diameter of a thin brass rod is to be measured by a vernier callipers. Why is a set of 100 measurements of the diameter expected to yield a ...
Answer: (a) Coiling method , (b) No (human eye resolution & mechanical limits), (c) Taking 100 readings reduces random error by 10×.
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