Two clocks `A` and `B` being tested against a standard clock located in the national laboratory At `10.00` AM by the standard clock, the readings of the two clocks are shown in following table
`{:("Day","Clock A","Clock B"),(I^("st"),10:00:06,8:15:00),(II^("nd"),10:01:13,8:15:0.1),(III^("rd"),9:59:0.8,8:15:04),(IV^("th"),10:02:15,8:14:58),(V^("th"),9:58:10,8:15:02):}`
If you are doing an experiment that requires precision time interval measurements, which of the two clocks will you prefer ?

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.