2555. A telescope is said to be inverted if its______________?

A. vertical circle is to its right and the bubble of the telescope is down
B. vertical circle is to its right and the bubble of the telescope is up
C. vertical circle is to its left and the bubble of the telescope is down
D. vertical circle is to its left and the bubble of the telescope is up
✅ The correct answer is option A.

2556. The error due to eccentricity of inner and outer axes can be eliminated by________________?

A. reading both verniers and taking the mean of the two
B. taking both face observations and taking the mean of the two
C. double sighting
D. taking mean of several readings distributed over different portions of the graduated circle
✅ The correct answer is option A.