Question Bank • QB_SWCE_ADV_146 NAT • 2 Marks

Section 4: Soil and Water Conservation Engineering

Surveying and Levelling

Subtopic: Types of levelling

Question Statement:

In a differential levelling traverse across a farm contour terrace, the sum of all backsights is $\sum BS = 14.850\text{ m}$ and the sum of all foresights is $\sum FS = 10.350\text{ m}$. If the reduced level of the starting benchmark is $\text{RL}_1 = 100.000\text{ m}$, the reduced level of the final station $\text{RL}_{\text{last}}$ in meters is ________ (round off to three decimal places).

Answer Key:

104.500

Step-by-Step Solution & Explanation

1. Standard arithmetic check for differential levelling: $\sum BS - \sum FS = \text{Last RL} - \text{First RL}$ 2. Substituting values: $\sum BS - \sum FS = 14.850 - 10.350 = +4.500\text{ m}$ $\text{Last RL} = \text{First RL} + (\sum BS - \sum FS)$ $\text{Last RL} = 100.000 + 4.500 = 104.500\text{ m}$
← Previous (QB_SWCE_ADV_135) Next (QB_SWCE_SUR_004) →

Practice In Authentic CBT Exam Interface

Test your skills under authentic timed conditions with live scoring and AIR percentile ranking.

Launch CBT Mock Test