# Civil Engineering - Surveying

Exercise : Surveying - Section 7

11.

A lens or combination of lenses in which the following defect is completely eliminated is called

*aplanatic*12.

While setting a plane table at a station it was found that the error in centering was 30 cm away from the ray of length 40 m drawn from the station. If the scale of the plan is 1 cm = 2 cm, the displacement of the end of the ray in plan from the true position will be

13.

In precision theodolite traverse if included angles are read twice and the mean reading accepted using both verniers having a least count of 30". Assuming the instrument to be in perfect adjustment, linear measurements correct to 6 mm per 30 metre tape duly corrected for temperature, slope and sag, the angular error of closure not to exceed (where

*n*is the number of traverse legs)14.

Straight, parallel and widely spaced contours represent

15.

The theodolites used for making tacheometric observations by optical wedge system, are

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