Surveying: A means of making relatively large-scale, accurate measurements of the Earth's surfaces

5100 nautical miles 5700 nautical miles 120 nautical miles 500 nautical miles Base line of the left photograph of stereo pair Base line of the right photograph of stereo pair Sum of the base lines of stereo pair Mean of the base lines of the stereo pair A great circle passing through the place and the poles A great circle whose plane is perpendicular to the axis of rotation and it also passes through the place A semi-circle which passes through the place and is terminated at the poles An arc of the great circle which passes through the place and is perpendicular to the equator High oblique Low oblique Vertical None of these Swing Tilt Tip None of these A contour is not necessarily a closed curve. A contour represents a ridge line if the concave side of lower value con¬tour lies towards the higher value contour. Two contours of different elevations do not cross each other except in case of an overhanging cliff. All of the above statements are correct. Contour interval on any map is kept constant. Direct method of contouring is cheap¬er than indirect method. Inter-visibility of points on a contour map cannot be ascertained. Slope of a hill cannot be determined with the help of contours. 99.345 m 100.345 m 100.655 m 101.870 m Swing Tilt Tip None of these Countouring Chain surveying Tacheometry All of the mentioned Plane table surveying Traversing Contouring Levelling Terrestrial photogrammetry Traverse surveying Aerial photogrammetry Theodolite surveying Covering the entire area Working from whole to part Taking measurements Determining the elevation differences Nautical charts for navigation Establishing mean sea level Laying an Alignment Making underground investigations Theodolite surveying Plane-table surveying Traverse surveying Compass surveying Water survey Yacht survey Machinery survey Cargo survey Plane table surveying Chain surveying Compass surveying Total station Local attraction due to the proximity of local attraction forces Pivot being bent Magnetic changes in the atmosphere due to clouds and Strom’s Variation in declination Traverse surveying Military surveying City surveying Topographic surveying

The instrument is to be shifted frequently

Fly levelling is being done over long distance

Many readings are to be taken from a single setting of the instrument

All of the above