Accuracy and Precision of Instruments

Two clocks are being tested against a standard clock located in a national laboratory. At $02:30:00$ pm by the standard clock, the readings of the two clocks are:

The deviation shown by the two clocks in a week are:

What is the difference between accuracy and precision?

Which of the following measurements is most precise?

If the standard deviation of a data is $0.012$. Find the variance

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

A spherometer has three legs so that it forms an equilateral triangle. The three legs of the spherometer are used for measuring both positively and negatively curved surfaces.

What is spherometer ?

Which of the following is incorrect statement regarding selection criteria of measuring instruments ?

The extent up to which the observed value agrees to the true value of the quantity is called _____.

Define Least count of an instrument.

Higher the accuracy smaller the error of measurement.

To calculate the effective length of pendulum, we measure :-

Closeness of two or more measured values is called as

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:

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:

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 figure given above indicates good accuracy and poor precision.

To calculate the effective length of pendulum, we measure :-