# Basic Geodesy - Quiz

## Quiz Question

 1. _______________________ is one of the earth sciences. Geodesy Geology 2. A major topic of geodesy is _________________. The shape and size of the earth The gravity field of the earth Point positioning All of the above 3. When traveling north at night, the north pole star appears ________________. To get higher in the sky To go lower in the sky 4. When traveling north by day, a man’s shadow at noon becomes ____________________. Smaller Longer 5. Erathosthenes, who lived in Alexandria, Egypt, in the third century BC, was a genius who computed the size of the earth from watching a sun dial cast its shadow at noon on a certain day. True False 6. In the 17th century, it was not possible to measure distances and gravity precisely enough to notice that the curvature of the earth was not the same at different places. True False 7. Three surfaces of the earth are: The topography, the geoid, and the ellipsoid The ground, the geoid, and the ellipsoid 8. Geoidal maps give the geoidal heights in relation to the _______________. Topography Ellipsoid 9. AMS is also called as ______________________. TOPOCOM Ellipsoid 10. The earth’s attraction called gravity does not cause things to fall. True False 11. At the seashore the difference between the denser land mass and the less dense water will have the same effect. True False 12. The science of _____________ is necessary to explain and evaluate the influence of gravity and to determine corrections to apply to our measurements. Geodesy Geology 13. The deflection of the horizontal is the angle between the observed vertical direction of the plumb line and the normal to the ellipsoidal model. True False 14. The angle of deflection equals the angle of ____________________. Warping Refraction 15. The level surface which coincides with mean sea level is called _________________. Ellipsoid Geoid 16. Astrogeodetic deflections use _________________. Surface gravity Triangulation Geodesy 17. Gravimetry use _____________________. Surface gravity Triangulation Geodesy 18. Traverse methods use ___________________. Angles Distances Angles and distances 19. Longitude refers to __________________. Set of circles of parallel to the equator Set of ellipses 20. Figure 30 represents the deflection of the ______________. Horizontal Vertical 21. A boat on the horizon is represented in ________________. Figure 1 Figure 2 Figure 3 22. The Eratosthenes concept is represented in ______________________. Figure 1 Figure 3 Figure 4 23. The ellipsoid is represented in ___________________. Figure 6 Figure 7 Figure 8 24. The earth’s shape could be told by the satellite data and this is pictorially represented in _________________. Figure 6 Figure 7 Figure 8 25. The warping of the level surface is represented in ___________________. Figure 16 Figure 17 Figure 18