alleryWhat is inserted into UTC now and then because Earth's spin varies?
AA leap second
BA leap minute
CA leap hour
DA leap week
Answer & Solution
Correct answer: A. A leap second
1. Earth's rotation period varies in ways that cannot be fully predicted.
2. Time standards fix this by adding one second now and then.
3. That is a leap second, not a whole minute or hour.
_Source: Wikipedia, Leap year, Lead section_
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