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Standard VII
Physics
Units and Their Standardization
Question

Which of the following methods of measurement of time is suitable for a race?
  1. Simple pendulum
  2. Stop watch
  3. Reflection of an object by sun rays
  4. Wall clock

A
Simple pendulum
B
Stop watch
C
Wall clock
D
Reflection of an object by sun rays
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Solution
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Answer:− 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?

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

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

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