Which of the following angles can be set out with the help of French cross staff?

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 possible to set out angles of 0’ to 360’ with help of ……….cross staff.
• It is possible to set out angles 45’ or 90’ with help of ……….cross staff.
• A French cross-staff has a magnetic compass at the top.
• An open cross-staff is commonly used for setting out
• The adjustable cross-staff is used for setting out an offset
• 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.
• The method of reiteration of measuring horizontal angles is generally preferred when several angles are to be measured at a particular station.
• The difference between the sum of the angles of a apherical triangle on the earth's surface and the angles of the corresponding plane triangle for every 195.5 km2 of area is only