Civil Engineering MCQs

Page No. 270

Which of the following errors cannot be eliminated by taking both face observations ?


a error due to horizontal axis not being perpendicular to the vertical axis


bindex error i.e. error due to imperfect adjustment of the vertical circle vernier


cerror due to non-parallelism of the axis of telescope level and line of collimation


dnone of the above


View Answer none of the above

In the double application of principle of reversion, the apparent error is_______________?


aequal to true error


bhalf the true error


ctwo times the true error


dfour times the true error



If a tripod settles in the interval that elapses between taking a back sight reading and the following foresight reading, then the elevation of turning point will_________________?


aincrease


bdecrease


cnot change


deither ‘a’ or ‘b’


View Answer increase

A’level line’is a______________?


ahorizontal line


b line parallel to the mean spheriodal surface of earth


cline passing through the center of cross hairs and the center of eye piece


dline passing through the objective lens and the eye-piece of a dumpy or tilting level



The rise and fall method of levelling provides a complete check on_______________?


abacksight


b intermediate sight


cforesight


dall of the above


View Answer all of the above

In an internal focussing type of telescope, the lens provided is_______________?


aconcave


bconvex


cplano-convex


d plano-concave


View Answer concave

The error due to eccentricity of inner and outer axes can be eliminated by________________?


areading both verniers and taking the mean of the two


b taking both face observations and taking the mean of the two


cdouble sighting


d taking mean of several readings distributed over different portions of the graduated circle



The adjustment of horizontal cross hair is required particularly when the instrument is used for_____________?


aleveling


bprolonging a straight line


cmeasurement of horizontal angles


dall of the above


View Answer leveling

The cross hairs in the surveying telescope are placed_____________?


amidway between eye piece and objec¬tive lens


bmuch closer to the eye-piece than to the objective lens


cmuch 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 ?


aerror due to eccentricity of verniers


berror due to displacement of station signals


cerror due to wrong adjustment of line of collimation and trunnion axis


d error due to inaccurate graduation



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