Which of the following time measuring devices is most precise ? (A) A wall clock (B) A stop watch (C) A digital watch (D) An atomic clock Give reason for your answer.

Which of the following time measuring devices is most precise ? (A) A

1.	Which of the following time measuring devices is most precise ? (A) A wall clock (B) A stop watch (C) A digital watch (D) An atomic clock Give reason for your answer.
Answer» Solution :A wall clock MEASURES TIME accurately upto ONE second. A stop watch measures time accurately upto a FRACTION of a second. A digital watch measures time up to a fraction of second. An atomic clock measures time most precisely as its precision is 1s in `10^(13)` s.