

Surveying - Engineering
Q1: In levelling operationA
if second reading is more than first, it represents a rise
B
if first reading is more than second, it represents a rise
C
if first reading is less than second, it represents a fall
D
if second reading is less than first, it represents a fall
E
both (b) and (c).
ANS:E - both (b) and (c). The given answer is absolutely right, first reading means the back sight-reading, so when the first reading (back sight-reading) is more than the second reading (foresight reading) it represents a rise and vice versa for fall.
For the same set up of instrument, staff reading is more at a lower point (depression) and less for a higher point (hill). Thus, staff reading provides information regarding the relative rise and fall of ground points. This provides the basics behind rising and fall method for finding out the elevation of unknown points. |


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