GATE CE 2024 Set 2 — Question 31

MCQ+1 / -0.33EasyTheodolite SurveyingDistance & Angle MeasurementGeomatics EngineeringTacheometryLevelling InstrumentsLevelling

Geomatics Engineering → Distance & Angle Measurement → Levelling Instruments

Last updated 5 September 2026

Question

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

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

Correct answer (B) P-iv, Q-iii, R-ii, S-i Solution To find the correct match, we evaluate the function of each instrument/part: 1. Bubble tube (P) : A spirit level or bubble tube is used to establish a horizontal line of sight. This process is known as levelling (iv). 2. Plumb bob (Q) : A plumb bob is used to define a vertical line passing through a point. In surveying, it is primarily used for centering (iii) the instrument exactly over a station mark on the ground. 3. Tangent screw (R) : Tangent screws are used for making minor movements (ii) or fine adjustments in the horizontal or vertical circles after the respective clamps have been tightened. 4. Stadia cross-wire (S) : Stadia hairs or cross-wires are used in tacheometry (i) to measure horizontal distances and vertical elevations by reading the intercept on a graduated staff. Matching these pairs gives: P-iv, Q-iii, R-ii, S-i, which corresponds to option (B). Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (B) P-iv, Q-iii, R-ii, S-i Solution To find the correct match, we evaluate the function of each instrument/part: 1. Bubble tube (P) : A spirit level or bubble tube is used to establish a horizontal line of sight. This process is known as levelling (iv). 2. Plumb bob (Q) : A plumb bob is used to define a vertical line passing through a point. In surveying, it is primarily used for centering (iii) the instrument exactly over a station mark on the ground. 3. Tangent screw (R) : Tangent screws are used for making minor movements (ii) or fine adjustments in the horizontal or vertical circles after the respective clamps have been tightened. 4. Stadia cross-wire (S) : Stadia hairs or cross-wires are used in tacheometry (i) to measure horizontal distances and vertical elevations by reading the intercept on a graduated staff. Matching these pairs gives: P-iv, Q-iii, R-ii, S-i, which corresponds to option (B).

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