During the alignment of a road by using direct ranging, the surveyor raises both the hands above his head and then, brings them down as a signal for his assistant. The correct action taken by his assistant would be:
- Aconsidering that the ranging rod is at correct positionCorrect
- Bmoving the ranging rod forward along the same line
- Cmoving the ranging rod backward along the same line
- DLift the ranging rod above the knee level
Solution
Concept
In ranging, both hands raised above the head and then brought down means 'correct', so the assistant should fix the rod.
Step-by-step solution
1. In direct ranging, the surveyor uses standard hand signals to guide the assistant. 2. Both hands raised above the head and then brought down is the signal for 'correct position'. 3. So the assistant treats the ranging rod as correct and fixes it there.
Explanation
This is a standard ranging signal. Raising both hands above the head and bringing them down tells the assistant that the rod is in line. The assistant should fix the rod at that point.
Why the other options are wrong
B and C: forward or backward movement is not signalled this way; ranging adjusts the rod sideways into the line. D: lifting the rod has no such standard signal.
Shortcut
Both hands up then down = 'All right, fix it'.
Common mistake
Confusing this signal with the 'move rod' signals (moving the right or left hand) or the 'plumb the rod' signal.
Correct answer: A) considering that the ranging rod is at correct position