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प्रश्न
Which of the following time measuring devices is most precise?
विकल्प
A wall clock.
A stop watch.
A digital watch.
An atomic clock.
उत्तर
An atomic clock.
Explanation:
A wall clock can measure time correctly up to one second. A stopwatch can measure time correctly up to a fraction of a second. A digital watch can measure time up to a fraction of a second. An atomic clock can measure time most precisely as its precision is 1s in 1013 s.
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