Question

Vernier calipers have an accuracy of
 A: $0.1cm$
 B: $0.1mm$
 C: $0.1\mu m$
 D: None of above

Answer 1

Hint : A caliper is a device used to measure the distance between two opposing sides of an object. It can be as simple as a compass with inward or outward-facing points. First the tips of the caliper are adjusted to fit across the points to be measured and the caliper is then removed and the distance between the tips is measured using a ruler.

Complete Solution :- A Vernier scale is a visual aid to take an accurate measurement reading between two graduation markings on a linear scale by using mechanical interpolation; thereby increasing resolution and reducing measurement uncertainty by using Vernier acuity to reduce human estimation error.
The Vernier is a subsidiary scale replacing a single measured value pointer and has for instance 10 divisions equals in distance to nine divisions on the main scale. The interpolated reading is obtained by observing which of the Vernier scale graduation is coincident with graduations on the main scale
Least Count of Vernier caliper in $0.1mm$.
So it can measure up to $2.5mm$ accurately.

Therefore, the conclusion is Option B is the correct answer.

Additional information:-
A caliper is a device used to measure dimension of an object- many types of caliper permit reading out a measurement on a ruled scale, a dial or a digital display. Some calipers can be as simple as compared with inward or outward facing point but no scale. The steps of the caliper are adjusted to fit across the point to be measured and the dimension read by the measuring between the lips with other measuring tools such as a ruler is used in many fields such as mechanical engineering metalworking woodworking science.

Note: The modern Vernier caliper was invented by Joseph R. Brown in 1851. The Vernier Caliper consists of a main scale fitted with a jaw at one end. Another jaw, containing the Vernier scale, moves over the main scale. When the two jaws are in contact, the zero of the main scale and the zero of the Vernier scale should coincide. If both the zeros do not coincide, there will be a positive or negative zero error.