A spherometer does not have a zero error because the result obtained is by taking the difference between the final and initial reading.

The pitch of a screw gauge is $0.5 \mathrm{mm}$ and its head scale has $50$ divisions. The least count of the screw gauge is:

The pitch of a screw gauge is $0.5 \mathrm{mm}$ and its head scale has $50$ divisions. The least count of the screw gauge is:

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

The figure given above indicates good accuracy and poor precision.

A spherometer has a least count of $0.005 \mathrm{mm}$ and its head scale is divided into $200$ equal divisions. The distance between consecutive thread on the spherometer screw is:

Measure of two quantities along with the precision of respective measuring instrument is

$A = 2.5 m s^{-1} \pm 0.5 m s^{-1}$

$B = 0.10 s \pm 0.01 s$

The value of AB will be 

A spherometer has a least count of $0.005 \mathrm{mm}$ and its head scale is divided into $200$ equal divisions. The distance between consecutive thread on the spherometer screw is: