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Measurement and Experimentation — PHYSICS STD 9 — Question

ICSE BoardEnglish MediumSTD 9PHYSICSMeasurement and Experimentation3 Marks
Question
Define the terms:
1. pitch
2. least count as applied to a vernier callipers.
✓

Answer

1. Pitch: "The pitch of a screw is the distance moved by the screw in one complete rotation of its head."
OR
Pitch may also be defined as "the distance between two consecutive threads of screw measured along the axis of screw."
$
\text { Pitch }=\frac{\text { Distance moved by thimble on M.S. }}{\text { Number of rotations of thimble }}
$
2. Least Count of Vernier Calliper : Least count of a vernier callipers is the difference between one main scale division (M.S.D.) and one vernier scale division (V.S.D.)

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