Two clocks are being tested againest a standard clock located in a national laboratory.
At 12 : 00 : 00 noon by the standard clock, the readings of the two clocks are

Which of the two clocks will you prefer to measure the time intervals during an experiment?

Options

A. clock A
B. clock B
C. either clock A or clock B
D. Neither clock A nor clock B

Answer

B

Explanation

The average reading of clock A is closure to the standard time and the variation in time is smaller for clock B. As clock's is zero error is not significant for precision work because a zero error can always be easily corrected. Hence clock B is to be preferred.