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JEE Main 201212 MayOnline
Exam
JEE Main
Year
2012
Date
12 May
Mode
Online
Subject
Physics
Chapter
Units and Dimensions

JEE Main 2012 · 12 May · Online · Physics · Units and Dimensions

A student measured the diameter of a wire using a screw gauge with...

A student measured the diameter of a wire using a screw gauge with the least count 0.001 cm0.001 \mathrm{~cm} and listed the measurements. The measured value should be recorded as

Options

  1. A5.3200 cm5.3200 \mathrm{~cm}
  2. B5.3 cm5.3 \mathrm{~cm}
  3. C5.32 cm5.32 \mathrm{~cm}
  4. D5.320 cm5.320 \mathrm{~cm}

Correct answer

D. 5.320 cm5.320 \mathrm{~cm}

Step-by-step solution

The least count (L.C.) of a screw guage is the smallest length which can be measured accurately with it. As least count is 0.001 cm=11000 cm0.001 \mathrm{~cm}=\frac{1}{1000} \mathrm{~cm} Hence measured value should be recorded upto 3 decimal places i.e., 5.320 cm5.320 \mathrm{~cm}
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