Surveying
Overturning of vehicles on a curve can be avoided by using

vertical curve
transition curve
reverse curve
compound curve

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

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

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