Surveying
Which of the following methods of offsets involves less measurement on the ground?

method of ties
all involve equal measurement on the ground
method of oblique offsets
method of perpendicular offsets

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Surveying
Which of the following errors can be eliminated by taking mean of bot face observations ?

error due to line of collimation not being perpendicular to horizontal axis
error due to imperfect graduations
error due to imperfect adjustment of plate levels
error due to eccentricity of verniers

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