Which of the following methods of measurement of time is suitable for a race?

Stop watch

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Wall clock

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Simple pendulum

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Reflection of an object by sun rays

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Solution

The correct option is B Stop watch
$A n s w e r : -$ A
Stop watch is used because of its precise measurement since its least count is less so able to measure fractions of a second which is required in a race because sometimes time taken by two contestants differ only by a fraction of a second so stopwatch helps in determining the winner.

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Question 2

Two clocks A and B are shown in the Figure. Clock A has an hour and a minute hand, whereas clock B has an hour hand, minute hand as well as a second hand. Which of the following statement is correct for these clocks?

(a) Time interval of 30 seconds can be measured by clock A

(b) Time interval of 30 seconds cannot be measured by clock B

(d) Time interval of 4 minutes 10 seconds can be measured by clock A

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