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

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Q. 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

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Q. 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)

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Q. Straight, parallel and widely spaced contours represent

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

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Q. Tilt of the staff in stadia tacheometry increases the intercept if it is

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Q. To orient a plane table at a point with two inaccessible points, the method generally adopted, is

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Q. The combined effect of curvature and refraction over a distance L kilometres is

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Q. Number of links per metre length of a chain are

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Q. Staff readings on pegs x and y from X station are 1.755 m and 2.850 m, and from station Y on staff head at Y and X are 0.655 m and 1.560 m. If reduced level of X is 105.5 m, the reduced level of Y is

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Q. The constant vertical distance between two adjacent contours, is called

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Q. The reduced level of a floor is 99.995 m, the staff reading on the floor is 1.505 m. If the inverted staff reading against the roof is 1.795 m, the floor level below the slab, is

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Q. The correction to be applied to each 30 metre chain length along θ° slope, is

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Q. If + 0.8% grade meets - 0.7% grade and the rate of change of grade for 30 m distance is 0.05, the length of the vertical curve will be

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Q. The included angles of a theodolite traverse, are generally measured

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Q. Location of contour gradient for a high way is best set out from

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Q. If h1 and h2 are the differences in level between ground and the formation levels, m is the slope of the sloping sides. D is the distance between the cross sections then, prismoidal correction for a level section is

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Q. In a telescope the object glass of focal length 14 cm, is located at 20 cm from the diaphragm. The focussing lens is midway between them when a staff 16.50 m away is focussed. The focal length of the focussing lens, is

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Q. The staff reading at a distance of 80 m from a level with the bubble at its centre is 1.31 m. When the bubble is moved by 5 divisions out of the centre, the reading is 1.39 m. The angular value of the one division of the bubble, is

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Q. If i is the stadia distance, f is the focal length and d is the distance between the objective and vertical axis of the techeometer, the multiplying constant, is

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