Question

If the zero of the vernier lies in between \[4.6\;{\rm{cm}}\] and \[4.7\;{\rm{cm}}\] on the main scale, the MSR is__________________.
 A. \[4.6\;{\rm{cm}}\]
B. \[4.65\;{\rm{cm}}\]
C. \[4.7\;{\rm{cm}}\]
D. \[0\;{\rm{cm}}\]

Answer 1

Hint: The above problem can be resolved using the fundamental and concept involving the measurement of dimensions using the vernier calliper. It is usually noticed that some value of zero is obtained practically that does not match with the value of zero of vernier calliper. So in this condition, we must look towards the lowest value of zero or the leftmost value of the zero to calculate the required main scale reading.

Complete step by step answer:
The main concept of the measurement for the reading in vernier calliper is that if the zero of the vernier calliper does not match with the reading on the main scale (MSR), then the minimum value of the calliper reading will be utilised to obtain the main scale reading ( MSR). Thus, in the given problem the minimum value is \[4.6\;{\rm{cm}}\].
Then the main scale reading ( MSR) is,
\[MSR = 4.6\;{\rm{cm}}\]
Therefore, the main scale reading (MSR) is 4.6 cm

So, the correct answer is “Option A”.

Note:
To resolve the given problem, try to understand the measurement application using the vernier calliper. The vernier calliper is one of the most potent instruments that measure the micro values of the order nearest to 0.02 mm. Moreover, it is one of an essential laboratory instrument that works on the principle of linear mechanisms, to measure the outer as well as the inner diameters of the object, along with the depth of the object.