vertical distance between two successive contour lines
252) In setting out a long straight line for the erection of transmission towers, it is recommended that the forward point be. set out with both face-right and face-left with reference to the preceding point and the mean position be taken. This field procedure eliminates the instrumental error where the
line of collimation is not perpendicular to the horizontal axis
253) the true length of a line is known to be 200m. When this is measured with a 20 m tape, the length is 200.80. the correct length of the 20 m tape is
254) In a closed traverse, the sum of south latitudes exceeds the sum of north latitudes and the sum of east departures exceeds the sum of west departures. The closing line will lie in the
256) While measuring horizontal angles by the method of repetition with a theodolite, readings are taken on both the verniers. Which one of the following errors will be eliminated by reading both the verniers?
260) If the staff is held normal to the line of sight and the angle of elevation and depression are kept same, then the horizontal distance between instrument station and staff station computed by observations will be
