railway RRB JE (CBT I + CBT II) Mock Test 2024 Surveying Levelling

The RL of a point is 120 m and elevation of the instrument is 1 m. If a contour line of 119 m is to be plotted, the reading on the staff should be:

1
2 m
2
0 m
3
1 m
4
1.5 m
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