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What is the CORRECT match between the survey instruments/parts of instruments shown in the table and the operations carried out with them? Instruments/Parts of instruments | Operations P - Bubble tube | i - Tacheometry Q - Plumb bob | ii - Minor movements R - Tangent screw | iii - Centering S - Stadia cross-wire | iv - Levelling

1. P-ii, Q-iii, R-iv, S-i
2. P-iv, Q-iii, R-ii, S-i
3. P-i, Q-iii, R-ii, S-iv
4. P-iii, Q-iv, R-i, S-ii

Correct answer: P-iv, Q-iii, R-ii, S-i

Solution

The bubble tube is used for levelling (P-iv) to ensure the instrument is horizontal, the plumb bob aids in centering (Q-iii) by providing a vertical reference, the tangent screw allows for minor movements (R-ii) to make precise adjustments, and the stadia cross-wire is utilized in tacheometry (S-i) for distance measurement.

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