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Measurement and Experimentation — PHYSICS STD 9 — Question

ICSE BoardEnglish MediumSTD 9PHYSICSMeasurement and Experimentation4 Marks
Question
(a) What do you understand by the term zero error?
(b) When does a vernier callipers has
1. positive error
2. negative error?
(c) State the correction if
1. positive error is 7 divisions
2. negative error is 7 divisions, when the least count is 0.01 cm .
✓

Answer

(a) Zero Error : A vernier callipers is said to have a zero error when zero of the main scale does not coincide with zero of vernier scale.
(b) Positive Error : If the zero of the vernier scale is on right hand side of zero of the main scale, then error is said to be positive and correction is said to be negative.
Image
Negative Error : If the zero of the vernier scale is on the left hand side of zero of the main scale, the error is said be negative and the correction is said to be positive.
Image
(c) When positive error is 7 divisions and L.C. is 0.01 cm Then correction $=-(+7 \times$ L.C. $)$
$
=-7 \times 0.01 cm=-0.07 cm
$
When negative error is 7 divisions and count (L.C.) is 0.01 cm
$
\text { Then correction }=-(-7 \times \text { L.C. })
$
$
=-(-7 \times 0.01) cm=+0.07 cm
$

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