Question

The length of an object measured by using a vernier caliper is $6.3mm$. If the $V.C.D.=3,1M.S.D.=1mm$and $N=10$, arrange the following steps to determine the main scale reading in proper sequence.
(A) Use the formula, length = M.S.R. + V.C.D. × L.C.
(B) Determine the least count.
(C) Note the values of V.C.D., M.S.D., and the number of vernier scale divisions.
(D) Determine the M.S.R.

• A. BACD
• B. CBAD
• C. ACBD
• D. BCAD

Answer 1

The correct option is B

CBAD

The explanation for the correct option

STEP 1. GIVEN DATA:

Length of the object = 6.3 mm

V.C.D = 3

1 M.S.D=1 mm

N=10

STEP 2 CALCULATIONS:

$$\begin{gathered} leastcount=\frac{M.S.D}{N} \\ L.C=\frac{1}{10} \end{gathered}$$

By using the formula,

$$\begin{gathered} M.S.R.+V.C.D.\times VC=6.3 \\ M.S.R.+3\times \frac{1}{10}=6.3 \\ M.S.R=6.3-0.3 \\ M.S.R.=6mm \end{gathered}$$

here the correct order is,

1. Note the values of V.C.D., M.S.D., and the number of vernier scale divisions.
2. Determine the least count.
3. use the formula,$length=M.S.R.+V.C.D.\times L.C.$
4. Determine the M.S.R.

Hence the correct option is b.