Advance level Physics

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Handout: 01
Measurements
Vernier Calipers
Questions
1. A vernier Callipers has 1 mm marks on the main scale.It has 20 equal
divisions on the Vernier scale which match with the 16 main scale
divisions.Find the least count for this Vernier Callipers.
2. The diameter of a cylinder is measured using a Vernier Callipers with no
zero error. It is found that the zero of the Vernier scale lies between 5.10 cm
and 5.15 cm of the main scale. The Vernier scale has 50 divisions equivalent
to 2.45 cm. The 24th division of the Vernier scale exactly coincides with one
of the main scale divisions. Find the diameter of the cylinder
3. A student used a vernier caliper to measure the length of his pencil. He
found that the caliper showed a reading of -0.02 cm even though the jaws of
the caliper was firmly closed. When he used the caliper to measure the
length of the pencil, the caliper showed a reading of 8.25 cm. What was the
correct measurement of the length of the pencil?

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4.
Diagram above shows the reading on a Vernier calliper. What is the reading
of the measurement?
5. What is the reading on the vernier scale as indicated by the arrows?
6. What is the reading on the vernier scale as indicated by the arrows?

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7. Read the following Vernier caliper measurements. (The scales have been
enlarged for easier reading.) The Vernier caliper is calibrated in metric units.

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8. Read the following Vernier caliper measurements. (The scales have been
enlarged for easier reading.) The Vernier caliper is calibrated in metric units.

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9.
Figure (a) above shows the zero error of a vernier calliper. Figure (b) shows
the reading on the vernier calliper when measuring the length of an object.
Find the correct reading of the measurement.
10.
The reading on the top is the measurement obtained and the reading at the
bottom is the zero error. Find the actual measurement.

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11.The reading on the top is the measurement obtained and the reading at the
bottom is the zero error. Find the actual measurement.
a)
b)
c)

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Review Questions – Vernier calipers.
1. What is the advantage of vernier calipers over a regular scale
graduated in millimeters?
2. What is the principle of vernier ?
3. What do you mean by least count of vernier calipers?
4. What is the use of lower jaws of a vernier calipers?
5. What is the use of upper jaws?
6. What is the use of the thin strip moving behind the main scale?
7. Two different vernier calipers have different number of equal
divisions on their vernier scales i) 10 equal divisions ii) 50 equal
divisions . Which can measure more accurately?
8. What is the ZERO error of a vernier calipers?
9. What is Positive zero error, how do we correct such an error in a
vernier calipers?
10. What is Negative zero error, how do we correct such an error in a
vernier calipers?