Surveying
Pick up the incorrect statement from the following. In a spherical triangle

Sum of any two sides is greater than the third
Sum of the three angles less than six right angles and greater than two right angles
Sum of the three angles is equal to two right angles
Every angle is less than two right angles

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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 adjustment of plate levels
error due to imperfect graduations
error due to eccentricity of verniers

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