Civil Engineering - Surveying

11. 

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

A. spherical aberration
B. chromatic aberration
C. coma
D. astigmatism.

Answer: Option A

Explanation:

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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

A. 0.02 cm
B. 0.15 cm
C. 02 cm
D. 0.1 cm

Answer: Option B

Explanation:

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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)

A. 50" n
B. 30" n
C. 60" n.

Answer: Option A

Explanation:

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14. 

Straight, parallel and widely spaced contours represent

A. a steep surface
B. a flat surface
C. an inclined plane surface
D. curved surface.

Answer: Option C

Explanation:

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15. 

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

A. provided with stadia hairs in front of eye piece
B. not provided with stadia hairs at all
C. fitted with a glass wedge inside the telescope
D. fitted with a glass wedge in front of telescope.

Answer: Option D

Explanation:

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