Which of the following does not express a time interval?

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A day

A second

A school period

Time of the first bell in the school

answer is D.

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Detailed Solution

The time of the first bell in the school does not express a time interval.
Here, we can say that the time of the first school bell does not indicate a time interval since it has only one value of time, but other variables such as a second, a day and a school session can be split into a number of shorter intervals of time. A time interval must have at least two time values, so the timing of the first bell at school does not indicate a time interval.

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