8-46. The difference between two diametrically opposite members on the  circle  of  a  one-second theodolite  as  viewed  through  the circle  reading  microscope  is  equal to plus or minus how many degrees? 1. 90° 2. 180° 3. 270° 4. 360° 8-47. What is the main difference between a wye level and a dumpy level? 1. Their magnifying power 2. The way they are used in the field 3. The  way  their  telescopes  are attached  to  the  horizontal (level)  bar 4. The  way  their  horizontal  bars are  attached  to  the  leveling head 8-48. What part(s) of a telescope should you adjust to bring the cross hairs and the object into clear focus? 1. Eyepiece 2. Focusing  knob 3. Both 1 and 2 above 4. Reticle adjusting screw 8-49. The bubble of a level vial on a surveying  instrument  may  become increasingly  difficult  to  center because  of  what  factor? 1. Temperature 2. Vial  age 3. Humidity 4. Vial sensitivity 8-50. On a tilting level, which of the following  screws  is  used  to  bring the bubble to the exact center? 1. Tangent 2. Micrometer 3. Leveling 4. Centering 8-51. You are setting up a military level. You  can  accomplish preliminary leveling by using which of  the  following  parts? 1. The level vial and circular bubble 2. The leveling screws and the micrometer drum 3. The leveling screws and the circular  bubble 4. The leveling screws and the level vial 8-52. The purpose of the compensator in a 8-53. 8-54. 8-55. self-leveling  level  is  to compensate  for  which  of  the following  factors? 1. Misalignment  of  the  vertical hair  only 2. Misalignment of the horizontal hair  only 3. Misalignment of both the vertical  and  horizontal  hairs 4. A slight out-of-level of the telescope In  surveying,    what  instrument  is often called the universal survey instrument? 1. Theodolite 2. Engineer’s  transit 3. Wye level 4. Automatic  level The Abney hand level differs from the plain hand level in that it has what  additional  part? 1. A  spirit  level 2. An  eyepiece 3. An optical telescope 4. A graduated arc Which  of  the  followinq  advantages does use of the plane-table and alidade  provide  over  use  of  other surveying   instruments? 1. The  need  to  measure  horizontal distances is eliminated 2. The  need  to  measure  vertical and  horizontal  angles  is eliminated 3. Both 1 and 2 above 4. A completed sketch or map manuscript is produced in the field 8-56. Which of the following methods can be used to orient a plane table during  fieldwork? 1. A transit 2. A  magnetic  compass 3. Sight on a point whose position is plotted on the plane table 4. Either 2 or 3 above, depending on  preference 8-57. What is the maximum angle above the horizontal that a telescopic alidade  is  capable  of  measuring? 1. 15° 2. 30° 3. 45° 4. 60° 55