# Which of the following errors can be eliminated by taking mean of bot face observations ? with Answer - Civil Engineering Mcqs | TestPrep

> Solved MCQ: Which of the following errors can be eliminated by taking mean of bot face observations ? Correct Answer: D. error due to line of collimation not being perpendicular to horizontal axis. Verified answer explanation for FPSC, PPSC, MDCAT, NTS, and CSS competitive exam preparation.

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# Which of the following errors can be eliminated by taking mean of bot face observations ?

Direct Answer & Quick Reference

The correct option is **D. error due to line of collimation not being perpendicular to horizontal axis**.

A. error due to imperfect graduations

B. error due to eccentricity of verniers

C. error due to imperfect adjustment of plate levels

D. error due to line of collimation not being perpendicular to horizontal axis **(Correct Answer)**

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Verified Key: D. error due to line of collimation not being perpendicular to horizontal axis
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