Q. Which of the following methods of levelling makes use of the phenomenon that difference in elevation between two points is proportional to the difference in atmospheric pressures at these points?

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Q. At a given point, the atmospheric pressure doesn’t remain constant in the course of the day, even in the course of an hour.

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Q. Which process of levelling in which the elevations of points are computed from the vertical angles and horizontal distances measured in the field?

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Q. Which of the following methods of levelling is a modified form of stadia levelling?

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Q. Surveyor’s telescope is an adaptation of Kepler’s telescope.

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Q. The optical principles of the surveying telescope are based on the fact that all parallel rays of light reaching a convex lens are bent when they leave it in such a manner that they intersect at a common point, called the focus.

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Q. In surveyor’s telescope, the convex lens nearest to the object is called ______________

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Q. In surveyor’s telescope, the convex lens nearest to the eye is called ____________

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Q. The object glass provides a virtual inverted image in front of the eyepiece which in turn magnifies the image to produce a real erect image in surveyors telescope.

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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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