Question 2

Which of the following does not express a time interval?

(a) A day

(b) A second

(c) A school period

(d) Time of the first bell in the school

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Solution

Time of the first bell in the school does not represent a time interval because it has only a single value of time, while other quantities like a second, a day and a school period can be divided to a number of shorter period of time. A time interval should have at least two values of time and hence the time of the first bell in the school does not represent a time interval.

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