In precision theodolite traverse for roads and railways, the angular error of closure should not exceed ............

Diaphragm of a surveying telescope is held inside ............

The Simpson's rule of areas assumes that the portions of the boundary between the ends of ordinates are ............

In setting up a plane table at any station ............

Horizontal distances obtained tacheometerically are corrected for ............

Cross-staff is used for ............

Level line and horizontal line are ............

The ratio of the focal length of the objective to that of an eye-piece of a telescope is called its ............

Which of the following methods of plane table surveying is used to locate the position of an inaccessible points?