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For initial surveys of tunnels the following activities are involved 1...

This question belongs to Civil Engineering Tunnel Engineering
Tunnel Engineering
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For initial surveys of tunnels, the following activities are involved:
1.Marking portal point with concrete pillars on the ground
2.Marking tunnel obligatory points on the topographical maps
3.Preliminary setting of the tunnel on the topographical Survey of India maps
4.Driving lines between the fixed obligatory points
The correct sequence of the activities is:

Answer & Solution
Correct Answer: Option A
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