Q. The line of sight is also called _____

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Q. What is the line which passes through the optical centres of objective and eye piece?

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Q. The eyepiece magnifies the cross hairs.

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Q. The focal length of an objective varies with eyepiece.

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Q. The establishment of line of sight, therefore, involves the following two essential conditions, the real image must be formed in front of the eyepiece, the plane of the image must coincide with that of the cross hairs.

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Q. The operation of forming or bringing the clear image of the object in the plane of cross hairs is known as ______

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Q. A level provides a vertical line of sight, a line tangential to a Level surface at the point where the instrument stands.

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Q. The theory of direct levelling neglects _____

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Q. Which of the following methods of spirit levelling is, levelling the object of which is solely to determine the difference in elevation of two points regardless of the horizontal position of the points with respect to each other?

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Q. Fly levelling is another name of _____

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Q. Which of the following methods of spirit levelling is, levelling the object of which is solely to determine the elevations of points at measured intervals along a given line?

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Q. Cross sectioning is the process of taking levels on each side of a main line tangential to that line.

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Q. Which of the following methods of spirit levelling is, levelling in which the difference in elevation between two points is accurately determined by two sets of reciprocal observations?

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Q. Which of the following methods of spirit levelling is, levelling in which the degree of precision required is too great to be attained by ordinary methods?

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Q. What is the height of instrument, if elevation of benchmark is 200.852 m, back sight is 2.324 m, fore sight is 1.836 m?

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Q. What is the elevation of a point, if the elevation of a benchmark is 200.852 m, back sight is 2.324 m, foresight is 1.836 m?

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Q. By balancing back sight and fore sight error due to curvature can be eliminated.

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Q. By balancing back sight and fore sight error due to non parallelism of the line of collimation can be eliminated.

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Q. By which of the following, the difference in elevation between two points can be calculated by taking a difference between the two readings and no correction for the inclination of the line of sight is necessary?

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Q. If the observed back sight and fore sight are x1 and x2. The correction back sight on A will be equal to x1-y1, where y1= D1 tan i°. The correct fore sight on B will be equal to x2-y2 where, y2 = D2 tan i°. Then what is the correction difference in level between A and B.

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