Question

Which of the following time measuring devices is most precise?

Options

• A wall clock.

• A stop watch.

• A digital watch.

• An atomic clock.

Answer 1

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.