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Civil Engineering Objective Questions { Surveying }

379.  Pick up the correct statement from the following :
A. The mirro optical square makes use of the fact that a ray of light reflected from two mirrors is turned through twice the angle between the mirror.
B. The prismatic type of optical square employs a pentagonal shaped prism
C. The cross staff consists essentially of an octagonal brass box with slits cut in each face
D. All the above.
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380.  The defect of chromatic aberration in a levelling telescope is remedied by using two lenses which are cemented together
A. One being a concave lens of flint glass and the other a convex lens of crown glass
B. One being a concave lens of crown glass and the other a convex lens of flint glass
C. Both being a crown glass
D. Both being of flint glass.
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381.  Ramsden eye piece which is free from spherical aberration consists of two identical piano-convex lenses with their curved faces facing, and separated by a distance equal to A One-fourth the focal length of either,
A. One-third the focal length of either
B. One-half the focal length of either
C. Two-third the focal length of either.
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382.  All level readings are taken to :
A. trunnion axis
B. vertical line
C. line of collimation
D. line of sight.
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383.  The first reading made with the staff on a point of known reduced level, is called
A. fore sight
B. back sight
C. intermediate sight
D. bench mark.
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384.  The line joining the points of equal altitude, is called
A. Contour
B. Vertical interval
C. Horizontal equivalent
D. None of these.
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385.  Pick up the statement not applicable to Bowditch's method of traverse adjustment from the following :
A. The probable error in the bearing of a traverse leg due to some inaccuracy in angular measurement gives a displacement of one end of the traverse leg, relative to the other end, equal and at right angles to that displacement, due to probable error in a measurement of its length.
B. The probable error in length (1) is taken to be proportional to IT
C. The total probable error is equal to the square root of twice the square of the displacement due to the probable error in linear measurement
D. None of the above.
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