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Two clocks are being tested against a st...

Two clocks are being tested against a standard clock located in a national laboratory At 12 : 00 : 00 noon by standard clock, the readins of the two clocks are
`{:("Day","Clock - I","Clock - II"),("Monday",12:00:05,10:15:06),("Tuesday",12:01:15,10:14:59),("Wednesday",11:59:08,10:15:18),("Thursday",12:01:50,10:15:07),("Thursday",12:01:50,10:15:07),("Friday",11:59:15,10:14:53),("Saturday",12:01:30,10:15:24),("Sunday",12:01:19,10:15:11):}`
From the Observations carefully read the following conclusive statements.
Statement I : Zero - error in clock II is much longer than zero - error in clock I.
Statement II : Zero - error can always be corrected by applying necessary corrective measures
Statement III : Precision of clock - I is more than precision of clock - II
Statement IV : Precision of clock - II is more than precision of clock - I
Pick up the correction option from the following.

Text Solution

Verified by Experts

The range of variation over the seven days of observations is `164` s for clock 1, and 32 s for clock 2. The average reading of clock 1 is much closer to the standard time than the average reading of clock 2.
The important point is that a clock is zero error is not as significant for precision work as its variation, because a .zero-error. can always be easily corrected. Hence clock 2 is to be preferred to clock 1.
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