Civil Engineering MCQJE Level Civil Engineering
The combined correction for curvature and refraction in levelling for a distance D (km) is:
SurveyingSurveyingMEDIUM
Choose the correct answer
A
C = 0.0785 D²
B
C = 0.0673 D² metres (D in km)
C
C = 0.0112 D²
D
C = 0.1 D²
Correct Answer
B. C = 0.0673 D² metres (D in km)
Why is this the answer?
Curvature correction = 0.0785 D² (m). Refraction correction = 0.0112 D² (m, reduces error). Combined correction C = 0.0673 D² metres where D in km. Curvature makes RL appear higher; refraction reduces this error (ray bends toward earth). Always SUBTRACTED from staff reading.
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 JE Level Premium Test Series. Full tests include timed attempts, rank comparison and subject-wise analysis.