| Why a positive or negative one second adjustment to the Coordinated Universal Time (CUT) called 'Leap Second', is necessary? |
| 1. Mean so\az day is decreasing slowly. |
| 2. Atomic clocks are slightly unstable. |
| 3. Rotation of Earth is being slowed by tidal friction and glacial rebound. |
| Select the correct answer using the codes given below. |
A) Only 1
B) Only 3
C) 2 and 3
D) All of these
Correct Answer: B
Solution :
[b] Statement 3 in this question is correct as rotation of Earth is being slowed by tidal friction and glacial rebound. Statement 1 is incorrect, because if rotation of Earth is being slowed by tidal friction and glacial rebound, the mean solar day must increase. Statement 2 is incorrect as atomic clocks are stable if we compare to the change in the mea solar time due to reason mentioned in Statement 3 so, right answer is [b].
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