Vernier Calipers Viva Questions and Answers
1. What is vernier? Why is it so named?
Vernier is a device for measuring small lengths accurately, correct upto a fraction of a millimeter. It is so named as it was devised by a French Mathematician, Paul Vernier.
2. State three uses of a vernier calipers.
a. To measure length of small objects.
b. To measure internal diameter of beaker.
c. To determine surface area and volume of sphere.
3. Name the instrument you could use for the measurement of internal and external diameter of a beaker.
Vernier calipers
4. What is meant by least count of a measuring instrument?
The smallest value of physical quantity which can be measured accurately by the instrument.
5. What is a vernier constant?
It is the difference between a main scale division and a vernier scale division.
6. What is meant by zero error of vernier calipers?
On bringing the jaws of vernier calipers in contact with each other, some times the zero of the vernier scale may not coincide with the zero of the main scale. Thus the vernier calipers is said to posses zero error.
7. How does zero error creep in this instrument?
It is due to (i) wear and tear on account of the long use of the instrument, (ii) manufacturing defect.
8. What is the function of the upper jaws of the vernier calipers?
The function of the upper jaws of the vernier calipers is to measure the internal dimensions of hollow objects.
9. What is meant by least count of a vernier calipers?
It is the smallest length that can be measured with the instrument and it is equal to the difference between a main scale division and a vernier scale division.
10. What is meant by least count of an instrument?
It is the smallest measurement that can be made with the given instrument.
11. The least count of a vernier is 0.001 cm. What is the order upto which it can measure length accurately?
It can measure accurately up to 10-3 cm.
12. What part of the vernier calipers is the vernier scale?
The sliding scale along the main scale is called vernier scale.
13. Which is the instrument you will use to measure the internal and external diameter of a tube?
Vernier Calipers
