In which of the following cases, orientation by back sighting is used? Options: A . &nbspWhen approximate levelling is required B . &nbspWhen second point is available for orientation C . &nbspWhen it is not possible to set instrument over station mark D . &nbspWhen speed is important than accuracy

In which of the following cases, orientation by back sighting is used?

Question

In which of the following cases, orientation by back sighting is used?

Options:

A . When approximate levelling is required

B . When second point is available for orientation

C . When it is not possible to set instrument over station mark

D . When speed is important than accuracy

Answer: Option C
Answer: (c).When it is not possible to set instrument over station mark

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