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

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berror due to refraction only

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cerror due to both curvature and re-fraction

✓


dnone of the above

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


atrue R.L

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bmore than true R.L

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cless than true R.L

✓


dnone of the above

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The sensitivity of a bubble tube can be increased by________________?


aincreasing the diameter of the tube

✓


bdecreasing the length of bubble

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cincreasing the viscosity of liquid

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d decreasing the radius of curvature of tube

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Refraction correction________________?


acompletely eliminates curvature correction

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bpartially eliminates curvature correction

✓


cadds to the curvature correction

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d has no effect on curvature correction

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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

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b100.00

✓


c102.30

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d103.30

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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

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c100.655m

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d101.870m

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View Answer 99.345 m

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


aforesight only

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bbacksight only

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cforesight and backsight

✓


d foresight and intermediate sight

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


aerror due to imperfect graduations

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berror due to eccentricity of verniers

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cerror due to imperfect adjustment of plate levels

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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

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caltitude bubble on telescope

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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

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bmeasurement of horizontal angles only

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cmeasurement of vertical angles only

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dmeasurement of both horizontal and vertical angles

✓



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