Question Bank • QB_SUB_SWCE_0452 NAT • 2 Marks

Section 4: Soil and Water Conservation Engineering

Surveying and Levelling

Subtopic: Chain surveying, methods of traversing

Question Statement:

The whole circle fore bearing of a survey line $AB$ is $FB = 85.5^\circ$. The back bearing of line $AB$ (in degrees) is:

Answer Key:

265.5

Step-by-Step Solution & Explanation

$\text{Back Bearing} = \text{Fore Bearing} \pm 180^\circ$ Since $FB < 180^\circ$: $BB = 85.5^\circ + 180^\circ = 265.5^\circ$
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