Surveying
Which of the following errors can be neutralised by setting the level midway between the two stations ?

None of these
error due to both curvature and re-fraction
error due to refraction only
error due to curvature only

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

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

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