Advertisements
Advertisements
Question
A boy uses a vernier callipers to measure the thickness of his pencil. He measures it to be 1.4 mm. If the zero error of vernier callipers is +0.02 cm, what is the correct thickness of the pencil?
Advertisements
Solution
Thickness of the pencil (observed reading) = 1.4 mm
Zero error = + 0.02 cm = + 0.2 mm
Correct reading = observed reading - zero error (with sign)
= 1.4 mm - 0.2 mm
= 1.2 mm
APPEARS IN
RELATED QUESTIONS
Draw a neat and labelled diagram of a vernier callipers. Name its main parts and state their functions.
Describe in steps, how would you use a vernier callipers to measure the length of a small rod?
What do you mean by zero error of a screw gauge? How is it accounted for?
The least count of a vernier calipers is :
Define metre according to the old definition.
Is it possible to increase the degree of accuracy by mathematical manipulations? Support your answer by an example.
Figure shows the position of vernier scale while measuring the external length of a wooden cylinder.
- What is the length recorded by the main scale?
- Which reading of vernier scale coincides with the main scale?
- Calculate the length.
Figure shows a screw gauge in which circular scale has 200 divisions. Calculate the least count and radius of the wire.
A micrometre screw gauge has a negative zero error of 7 divisions. While measuring the diameter of a wire the reading on the main scale is 2 divisions and 79th circular scale division coincides with baseline.
If the number of divisions on the main scale is 10 to a centimetre and circular scale has 100 divisions, calculate
- pitch
- observed diameter
- least count
- corrected diameter.
A vernier caliper using the scale invented by Galileo.
