Surveying
The type of surveying which requires least office work is

theodolite surveying
tacheomefry
plane table surveying
trigonometrical levelling

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Surveying
Which of the following errors cannot be eliminated by taking both face observations ?

error due to horizontal axis not being perpendicular to the vertical axis
None of these
error due to non-parallelism of the axis of telescope level and line of collimation
index error i.e. error due to imperfect adjustment of the vertical circle vernier

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