The cross hairs in the surveying telescope are placed_____________?
(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
Which of the following errors is not eliminated by the method of repetition of horizontal angle measurement ?
(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
Which of the following errors can be neutralised by setting the level midway between the two stations ?
(A) error due to curvature only
(B) error due to refraction only
(C) error due to both curvature and re-fraction
(D) none of the above
If the staff is not held vertical at a level¬ling station, the reduced level calculated from the observation would be_______________?
(A) true R.L
(B) more than true R.L
(C) less than true R.L
(D) none of the above
The sensitivity of a bubble tube can be increased by________________?
(A) increasing the diameter of the tube
(B) decreasing the length of bubble
(C) increasing the viscosity of liquid
(D) decreasing the radius of curvature of tube
Refraction correction________________?
(A) completely eliminates curvature correction
(B) partially eliminates curvature correction
(C) adds to the curvature correction
(D) has no effect on curvature correction
As applied to staff readings, the corrections for curvature and refraction are respectively The above table shows a part of a level field book. The value of X should be________________?
(A) 98.70
(B) 100.00
(C) 102.30
(D) 103.30
If the R.L. of a B.M. is 100.00 m, the back- sight is 1.215 m and the foresight is 1.870 m, the R.L. of the forward station is_________________?
(A) 99.345 m
(B) 100.345 m
(C) 100.655m
(D) 101.870m
The following sights are taken on a “turning point”________________?
(A) foresight only
(B) backsight only
(C) foresight and backsight
(D) foresight and intermediate sight
Which of the following errors can be eliminated by taking mean of bot face observations ?
(A) error due to imperfect graduations
(B) error due to eccentricity of verniers
(C) error due to imperfect adjustment of plate levels
(D) error due to line of collimation not being perpendicular to horizontal axis