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Civil Engineering Objective Questions { Surveying }



43.  Determining the difference in elevation between two points on the surface of the earth, is known as
A. levelling
B. simple leveling
C. differential levelling
D. longitudinal levelling.
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44.  When the bubble of the level tube of a level, remains central
A. line of sight is horizontal
B. axis of the telescope is horizontal
C. line of collimation is horizontal
D. geometrical axis of the telescope is horizontal.
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45. 1n an adjusted level, when the bubble is central, the axis of the bubble tube becomes parallel to
A. line of sight
B. line of collimation
C. axis of the telescope
D. None of these.
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46.  The imaginary line passing through the intersection of cross hairs and the optical centre of the objective, is known as
A. line of sight
B. line of collimation
C. axis of the telescope
D. none of these.
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47.  Cross hairs in surveying telescopes, are fitted
A. in the objective glass
B. at the centre of the telescope
C. at the optical centre of the eye piece
D. in front of the eye piece,
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48.  The real image of an object formed by the objective, must lie
A. in the plane of cross hairs
B. at the centre of the telescope
C. at the optical centre of the eye-piece
D. anywhere inside the telescope.
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49.  An internal focussing type surveying telescope, may be focussed by the movement of
A. objective glass of the telescope
B. convex-lens in the telescope
C. concave lens in the telescope
D. plano-convex lens in the telescope.
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