Question:

Arrange the following temporary adjustment of the theodolite in the correct sequence :
A. Centering
B. Elimination of parallax
C. Levelling
D. Setting
Choose the correct answer from the options given below :

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Remember the mnemonic "SLC-P": Setting, Leveling/Centering (simultaneous), and Parallax elimination.
Updated On: May 20, 2026
  • A, B, C, D
  • A, D, B, C
  • D, A, C, B
  • D, C, B, A
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The Correct Option is C

Solution and Explanation

Concept: Temporary adjustments of a theodolite are those which are made at every instrument station before starting observations to ensure the instrument is correctly positioned and the line of sight is clear.

Step 1:
Initial Setup.
The first step is placing the instrument over the station. "Setting up" involves placing the tripod and fixing the theodolite on the tripod head at a convenient height. Therefore, D is the first step.

Step 2:
Horizontal Positioning.
Once the instrument is on the tripod, it must be placed exactly over the station mark using a plumb bob or optical plummet. This is "Centering." Therefore, A follows D.

Step 3:
Vertical Alignment.
After centering, the vertical axis of the instrument must be made truly vertical. This is done using the leveling screws and the plate level tube. Therefore, C follows A.

Step 4:
Optical Adjustment.
The final step is to ensure the crosshairs and the object are seen clearly without any relative movement when the eye is moved. This involves focusing the eyepiece and the objective lens. Therefore, B is the final step. The sequence is D-A-C-B.
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