Civil Engineering MCQJE Level Civil Engineering
Local attraction in compass surveying is caused by:
SurveyingCompass SurveyingEASY
Choose the correct answer
A
Strong wind
B
Presence of magnetic materials (iron/steel objects) near compass → deflection of needle from magnetic north
C
Incorrect sighting
D
High elevation
Correct Answer
B. Presence of magnetic materials (iron/steel objects) near compass → deflection of needle from magnetic north
Why is this the answer?
Local attraction: magnetic objects (iron structures, electric cables, steel bars) cause local deflection of compass needle. Detected by comparing FB and BB of a line: if they differ by ≠180°, local attraction at one/both stations.
Related Surveying MCQs
More solved Surveying questions for AE/JE Civil Engineering exams.
- A 'Digital Elevation Model' (DEM) is used in GIS for:
- 'Contour interval' selection for a topographic survey depends on:
- The 'photogrammetric control' (ground control points) in aerial survey are required for:
- The 'EDM' (Electronic Distance Measurement) instrument measures distances using:
- The 'photogrammetric stereomodel' from two overlapping aerial photos allows...
- The 'corrections' applied to measured chain/tape lengths include all EXCEPT:
Practice more Civil Engineering questions
This MCQ belongs to Magic Mock Test Series — SSC JE Civil (Paper II). Full tests include timed attempts, rank comparison and subject-wise analysis.