This set of Surveying Multiple Choice Questions & Answers (MCQs) focuses on “Errors in Plane Tabling”.
1. The usage of telescopic alidade usually increases the occurrence of errors in a huge rate.
Explanation: The usage of telescopic alidade has the chances of increasing the errors. It can be due to the line of sight not being perpendicular to horizontal axis, line of collimation not being perpendicular to the horizontal axis etc., which can be minimised by proper usage.
2. Degree of precision depends on____________
a) Quality of instrument
b) Usage of the instrument
d) Type of work being done
Explanation: The quality of instrument used will affect the recorded values and degree of precision depends upon the character of survey, system adopted too.
3. Plain alidade will cause less error when compared to telescopic alidade.
Explanation: Telescopic alidade is a newly introduced one with a lot more benefits than plain alidade, but due o less accuracy it lacks behind plain alidade.
4. In a magnetic area, which type of surveying can be employed?
a) Traverse surveying
b) Compass surveying
c) Theodolite surveying
d) Plane table surveying
Explanation: Other than plane table surveying, remaining methods need a compass for initiating the work in which it is not possible to access compass in a magnetic area. Plane table surveying can be employed there as it can be done without usage of compass.
5. When difference in elevation between points is more, which of the following would be affected more?
a) Points plotted
b) Alidade position
c) Horizontality of board
d) Level of board
Explanation: If the difference in elevation between the points plotted is more, then the horizontality of the board will be disturbed by which entire process is halted until it is set right.
6. Plane table surveying is capable of providing accurate work.
Explanation: Plane table surveying involves both recording and plotting of points simultaneously which makes it less accurate.
7. Which of the following must be checked at every station?
a) Values obtained
b) Traverse area
c) Points to be sighted
d) Orientation of table
Explanation: Orientation is done with compass and there is possibility of local attraction. Errors in orientation contribute towards distortion of the survey. This orientation should be checked at as many stations as possible by sighting distant objects which are already plotted.
8. Which of the following can cause more damage while using a plane table for surveying?
a) Climatic changes
b) Instruments used
c) Sighting error
d) Inaccurate centring
Explanation: Except climatic change, remaining errors can be minimised by an alternative. Climatic change may increase or decrease the values from the original.
9. Which of the following errors cannot be minimised?
a) Error in instrument
b) Error in sighting
c) Error while plotting
d) Personal errors
Explanation: If the error is identified as error due to plotting, there is no possibility other than re-surveying.
10. In plane table surveying, it is difficult to reproduce the map to some different scale.
Explanation: Since notes of measurements are not recorded, it is inconvenient to reproduce the map to some different scale.
Sanfoundry Global Education & Learning Series – Surveying.
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