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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Physics
Chapter
Units and Dimensions

NTA Abhyas 2020 · Physics · Units and Dimensions

A screw gauge with a pitch of 1mm has 100 divisions on its circular...

A screw gauge with a pitch of 1mm1mm has 100100 divisions on its circular scale. When it is used to measure the diameter of a thin wire, the main scale reading is 3mm3mm and the circular scale reading is 45.45 . If DD is the diameter of the wire in mm,m, then find the value of D.D.

Correct answer

3.45

Step-by-step solution

Leastcount = \dfrac{Pitch}{No . ofdivision} = \dfrac{1mm}{100} = 0.01mm<br/>Diameterofwire=mainscale+circularscalereading<br />Diameterofwire = mainscale + circularscalereading
=3mm+(L.C)×No.ofdivision= 3mm + \left(L . C\right) \times No . ofdivision
=3mm+0.01×45= 3mm + 0.01 \times 45
D=3.45mmD = 3.45mm
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