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PhysicsPractical physicsMiscellaneousEasy2 minPYQ_2020

PhysicsEasynumerical

A screw gauge with a pitch of $1 m m$ has $100$ divisions on its circular scale. When it is used to measure the diameter of a thin wire, the main scale reading is $3 m m$ and the circular scale reading is $45 .$ If $D$ is the diameter of the wire in m $m,$ then find the value of $D.$

Answer:

3.45

Solution:

$L e a s t c o u n t = \frac{P i t c h}{N o . o f d i v i s i o n} = \frac{1 m m}{100} = 0.01 m m$
$D i a m e t e r o f w i r e = m a i n s c a l e + c i r c u l a r s c a l e r e a d i n g$
$= 3 m m + (L . C) \times N o . o f d i v i s i o n$
$= 3 m m + 0.01 \times 45$
$D = 3.45 m m$

Stream:NTA_ABHYASSubject:PhysicsTopic:Practical physicsSubtopic:Miscellaneous

⏱ 2mℹ️ Source: PYQ_2020

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