Surveying

A. horizontal line
B. line parallel to the mean spheriodal surface of earth
C. line passing through the center of cross hairs and the center of eye piece
D. line passing through the objective lens and the eye-piece of a dumpy or tilting level

A. backsight
B. intermediate sight
C. foresight
D. all of the above

A. concave
B. convex
C. plano-convex
D. plano-concave

A. reading both verniers and taking the mean of the two
B. taking both face observations and taking the mean of the two
C. double sighting
D. taking mean of several readings distributed over different portions of the graduated circle

A. leveling
B. prolonging a straight line
C. measurement of horizontal angles
D. all of the above

A. midway between eye piece and objec¬tive lens
B. much closer to the eye-piece than to the objective lens
C. much closer to the objective lens than to the eye piece
D. anywhere between eye-piece and objective lens

A. error due to eccentricity of verniers
B. error due to displacement of station signals
C. error due to wrong adjustment of line of collimation and trunnion axis
D. error due to inaccurate graduation

A. adjustment of plate levels
B. adjustment of line of sight
C. adjustment of horizontal axis
D. adjustment of altitude bubble and vertical index frame

A. on its outer spindle with a relative motion between the vernier and graduated scale of lower plate
B. on its outer spindle without a relative motion between the vernier and gra-duated scale of lower plate
C. on its inner spindle with a relative motion between the vernier and the graduated scale of lower plate
D. on its inner spindle without a relative motion between the vernier and the graduated scale of lower plate

A. the length of telescope
B. the diameter of vertical circle
C. the diameter of lower plate
D. the diameter of upper plate