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DIRECTIONS: Read the passage given below and answer the questions that follow. Passage-2 The smallest time interval that can be measured with commonly available clocks and watches is one second. However now special clocks are available that can measure time intervals smaller than a second. Some of these can measure time intervals as small as one millionth or even one billionth of a second. Which of the following will be needed to measure the time period of a pendulum?

A) a stop watch               

B) a table clock

C) a wrist watch  

D) any one of these