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

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

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

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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

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bhalf the true error

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ctwo times the true error

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dfour times the true error

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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

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cnot change

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deither ‘a’ or ‘b’

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View Answer increase

A’level line’is a______________?


ahorizontal line

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b line parallel to the mean spheriodal surface of earth

✓


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

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

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


abacksight

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b intermediate sight

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cforesight

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dall of the above

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View Answer all of the above

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


aconcave

✓


bconvex

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cplano-convex

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d plano-concave

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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

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cdouble sighting

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

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


aleveling

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bprolonging a straight line

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cmeasurement of horizontal angles

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dall of the above

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View Answer leveling

The cross hairs in the surveying telescope are placed_____________?


amidway between eye piece and objec¬tive lens

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

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cmuch closer to the objective lens than to the eye piece

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d anywhere between eye-piece and objective lens

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Which of the following errors is not eliminated by the method of repetition of horizontal angle measurement ?


aerror due to eccentricity of verniers

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berror due to displacement of station signals

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

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d error due to inaccurate graduation

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