Question

The diameter of a thin wire can be measured by:
(A) A vernier callipers
(B) A metre rule
(C) A screw gauge
(D) Any of these

Answer 1

Hint : Here we will refer to all the given terminologies and their uses and check for which measures the thin diameter of the wire. Different precision instruments are used to measure the thickness and thinness of the objects such as wire.

Complete Step By Step Answer:
A screw gauge is a precision instrument which is used for measuring the diameter of the circular objects mostly like wires with an accuracy of $0.001$ cm.
A screw gauge consists of the hollow cylinder which is mounted on a U shaped frame and this hollow cylinder leads to a ratchet which is meant for the fine adjustments. The U shaped frame consists of the flat end known as the stud and the screw on the other side. By rotating the hollow cylinder called the thimble, the screw can be moved inside the nut by the fitted in the U frame and this is known as the main scale. The hollow cylinder or the thimble is graduated into equal parts of $50{\text{ or 100}}$ parts and this is called the circular scale.
From the given multiple choices, the option C is the correct answer.

Note :
Know the difference between the different precision instruments and its properties. A vernier Calliper is the scale which is the visual aid to take an accurate measurement reading between the two graduation markings on the linear scale by using mechanical interpolation. The meter rule is the device which is used to measure the length of the different objects.