If the staff is not held vertical at a level¬ling station, the reduced level calculated from the observation would be

Related MCQs

• 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.
• 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
• 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.
• 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
• In levelling, the correction for curvature (in metres) is equal, where D = Distance from the level to the staff reading in kilometres.
• When the effect of curvature is taken into account in levelling, the true staff reading is obtained by
• After fixing the plane table to the tripod, the main operations which are needed at each plane table station are i) levelling ii) orientation iii) centering The correct sequence of these operations is
• If the horizontal distance between the staff point and the point of observation is d, then the error due to curvature of earth is proportional to
• Which of the following is not the function of levelling head ?
• Which of the following is not a method of levelling?