Civil Engineering MCQs

Page No. 269

Which of the following errors can be neutralised by setting the level midway between the two stations ?


aerror due to curvature only


berror due to refraction only


cerror due to both curvature and re-fraction


dnone of the above



If the staff is not held vertical at a level¬ling station, the reduced level calculated from the observation would be_______________?


atrue R.L


bmore than true R.L


cless than true R.L


dnone of the above



The sensitivity of a bubble tube can be increased by________________?


aincreasing the diameter of the tube


bdecreasing the length of bubble


cincreasing the viscosity of liquid


d decreasing the radius of curvature of tube



Refraction correction________________?


acompletely eliminates curvature correction


bpartially eliminates curvature correction


cadds 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________________?


a98.70


b100.00


c102.30


d103.30


View Answer 100.00

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_________________?


a99.345 m


b100.345 m


c100.655m


d101.870m


View Answer 99.345 m

The following sights are taken on a “turning point”________________?


aforesight only


bbacksight only


cforesight and backsight


d foresight and intermediate sight



Which of the following errors can be eliminated by taking mean of bot face observations ?


aerror due to imperfect graduations


berror due to eccentricity of verniers


cerror due to imperfect adjustment of plate levels


derror due to line of collimation not being perpendicular to horizontal axis



If altitude bubble is provided both on index frame as well as on telescope of a theodolite, then the instrument is levelled with reference to_________________?


aaltitude bubble on index frame


baltitude bubble on index frame if it is to be used as a level


caltitude bubble on telescope


daltitude bubble on telescope if it is to be used as a level


View Answer both (1) and (4)

Theodolite is an instrument used for_________________?


atightening the capstan-headed nuts of level tube


bmeasurement of horizontal angles only


cmeasurement of vertical angles only


dmeasurement of both horizontal and vertical angles



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