When the effect of curvature is taken into account in levelling, the true staff reading is obtained by

Related MCQs

• When the effect of refraction is taken into account in levelling, the true staff reading is obtained by subtracting the correction for refraction from the observed staff reading.
• It is required to find the difference in elevation between two points A and B. During levelling, it is found that the staff reading at B is more than the staff reading at A. It indicates that the point A is
• In levelling, the correction for curvature (in metres) is equal, where D = Distance from the level to the staff reading in kilometres.
• When a staff is sighted through the telescope, a certain length of staff is intercepted by the stadia lines. The staff intercept varies with the distance at which the staff is held.
• In levelling, the correction for combined curvature and refraction (in metres) is equal to
• A staff reading taken on a bench mark or a point of known elevation is called
• A staff reading taken on a point whose elevation is to be determined as on a change point is called.
• In levelling, the effect of refraction may be taken as
• While viewing through a level telescope and moving the eye slightly, a relative movement occurs between the image of the levelling staff and the cross hairs. The instrument is
• As applied to staff readings, the corrections for curvature and refraction are respectively The above table shows a part of a level field book. The value of X should be