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Q: Indirect Ranging is done when both ends of a survey line are
  • A. Not visible
  • B. Not intervisible
  • C. Visible
  • D. Intervisible
Correct Answer: Option B - Indirect ranging– When the end station are not intervisible due to rising ground between them or due to long distance between the ends, then indirect ranging is done to layout a straight line between inaccessible points or points across a mountain. Direct ranging– When ranging rods are placed on intermediate points along the chain line by direct observation from either of the end stations, the process is known as direct ranging.
B. Indirect ranging– When the end station are not intervisible due to rising ground between them or due to long distance between the ends, then indirect ranging is done to layout a straight line between inaccessible points or points across a mountain. Direct ranging– When ranging rods are placed on intermediate points along the chain line by direct observation from either of the end stations, the process is known as direct ranging.

Explanations:

Indirect ranging– When the end station are not intervisible due to rising ground between them or due to long distance between the ends, then indirect ranging is done to layout a straight line between inaccessible points or points across a mountain. Direct ranging– When ranging rods are placed on intermediate points along the chain line by direct observation from either of the end stations, the process is known as direct ranging.