## surveying

###### Hydrographic surveys deal with the mapping of
 A large water bodies B heavenly bodies C mountaineous region D canal system
 ANS: A - large water bodies

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###### If h is the difference in level between end points separated by l, then the slope correction is    . The second term may be neglected if the value of h in a 20 m distance is less than
 A m B 1m C 2m D 3m
 ANS: D - 3m

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###### An ideal vertical curve to join two gradients, is
 A circular B parabolic C elliptical D hyperbolic E none of these.
 ANS: B - parabolic

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###### Pick up the correct statement from the following :
 A the eyepiece plays no part in defining the line of sight B the diaphragm plays no part in defining the line of sight C the optical centre of the objective plays no part in defining the line of sight D none of these.
 ANS: A - the eyepiece plays no part in defining the line of sight

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###### The intercept of a staff
 A is maximum if the staff is held truly normal to the line of sight. B is minimum if the staff is held truly normal to the line of sight. C decreases if the staff is tilted away from normal D increases if the staff is tilted towards normal.
 ANS: B - is minimum if the staff is held truly normal to the line of sight.

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###### The radius of curvature of the arc of the bubble tube is generally kept
 A 10 m B 20 m C 50m D 100 m
 ANS: D - 100 m

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###### If S is the length of a subchord and R is the radius of simple curve, the angle of deflection between its tangent and sub-chord, in minutes, is equal to
 A 573 S/R B 573 R/S C 171.9 S/R D 1718.9 R/S E 1718.9 S/R.
 ANS: E - 1718.9 S/R.

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###### 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.
 ANS: A - in the plane of cross hairs

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###### In chain surveying tie lines are primarily provided
 A to check the accuracy of the survey B to take offsets for detail survey C to avoid long offsets from chain lines D to increase the number of chain lines.
 ANS: C - to avoid long offsets from chain lines

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###### Pick up the correct statement from the following :
 A the tangent screw enables to give small movement under conditions of smooth and positive control B standing on the tripod is the levelling head or trib arch C the levelling screws are used to tilt the instrument so that its rotation axis is truly vertical D all the above.
 ANS: D - all the above.

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