Published by:
CGP EDU Academic Team
Published on: September 12, 2026
Which of the following is not the unit of time
Text Solution
Verified by ExpertsThe correct answer is:
B
Step 1: Identify each option to determine if it is a unit of time.
Option A: Microsecond is a standard unit of time equal to $10^{-6}$ seconds.
Option C: Lunar months refer to the time it takes for the Moon to complete its phases, which is often approximated as about 29.5 days.
Option D: Parallactic second is a measure used in astronomy and is related to angular measurement, approximately related to time.
Option B: A leap year is not a unit of time itself; it is a year that has an additional day (February 29) added to keep the calendar year synchronized with the astronomical year.
Therefore, the option that is not a unit of time is B.
Option A: Microsecond is a standard unit of time equal to $10^{-6}$ seconds.
Option C: Lunar months refer to the time it takes for the Moon to complete its phases, which is often approximated as about 29.5 days.
Option D: Parallactic second is a measure used in astronomy and is related to angular measurement, approximately related to time.
Option B: A leap year is not a unit of time itself; it is a year that has an additional day (February 29) added to keep the calendar year synchronized with the astronomical year.
Therefore, the option that is not a unit of time is B.
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