Question

Name the part of the Vernier calipers which is used to measure the thickness of a pencil.
A. Lower jaws of Vernier calipers
B. Upper jaws of Vernier calipers
C. Lock screw of Vernier calipers
D. Thumbscrew of Vernier calipers

Answer 1

Hint: To solve this question, firstly we will understand the concept of Vernier caliper and its parts i.e. Outside large jaws (lower), Inside small jaws (upper), Depth probe, etc. Then we will compare all the given options to get the required answer.

Complete answer:
The Vernier caliper gives a direct reading of the distance measured with high accuracy and precision. Vernier calipers are functionally identical, with different ways of reading the results. These calipers compromise a calibrated scale with a fixed jaw, and another jaw, with a pointer, that slides along the scale.

Vernier calipers can measure internal dimensions. This probe is slender and can get into deep grooves that may prove difficult for other measuring tools. The simplest method is to read the position of the pointer directly on the scale.

The Vernier scales may include metric measurements on the lower part of the scale and inch measurements on the upper or vice-versa. A Vernier scale allows more accurate interpolation and is the universal practice. Vernier calipers are commonly used in industry to provide a precision to 0.01mm.

Parts of Vernier calipers-

a.)Outside large jaws (lower) - These are used to measure the external diameter or width, the thickness of an object.
b.)Inside small jaws (upper) – These are used to measure the internal diameter of an object.
c.)Depth probe - These are used to measure the depths of an object or a hole.
d.)Vernier scale – It gives interpolated measurements in fractions of an inch.
e.)Retainer – It is used to block movable parts to allow the easy transferring of a measurement.
Therefore, we conclude that the lower jaw is the part of the Vernier calipers which is used to measure the thickness of a pencil.

So, the correct answer is “Option A”.

Note:
Vernier calipers are available in sizes that can measure up to 1828 mm (72 inches). Also one should know that along with the Vernier caliper, there are seven types of the caliper as follows- inside, outside, divider, odd leg, dial, digital, micrometer. The type used depends on the problem we are trying to solve.