Q. Which of the following is not the unit of time
A) Micro $second$
B) Leap year
C) Lunar month
D) Parallactic $second$
Explanation
The correct answer is Option D: Parallactic $second$.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.