If whole circle bearing of a line is 120°, its reduced bearing is
N 120° E
N 60° E.
S 60° E
S 20° E
Probable systematic error in precise levelling as recommended by International Geodetic Association should not exceed (where k is inkilometers.
0.2 k mm.
± 0.1 k mm
± 0.2 k mm
± 0.1 k
The slope correction for a length of 30 m along a gradient of 1 in 20, is
In case of reduction of levels by the height of instrument method,
∑ B.S. - ∑ F.S. = difference in R.L.S of the first station and last station
neither (a) nor (b).
both (A) and (B) above
∑ (R.L. + I + F.S.) - first R.L = ∑ (H.I. + No. of R.L.s.)
The bearing of AB is 190° and that of CB is 260° 30'. The included angle ABC, is
NONE OF THESE
A relatively fixed point of known elevation above datum, is called
For preparation of a contour plan for a route survey
indirect method of contouring is used.
method of trace contour is used
method of squares is used
method of cross profile is used
It is more difficult to obtain good results while measuringhorizontal distance by stepping
in plane areas.
in low undulations
The method generally preferred to for contouring an undulating area, is
plane table surveying
The zero of the graduated circle of a prismatic compass is located at
Cross-staff is used for
measuring contour gradient
NONE OF THESE
setting out right angles
The bubble tube is nearly filled with
a liquid which is very mobile
a liquid having low freezing point
All the above.
alcohol or chloroform
Check lines (or proof lines) in Chain Surveying, are essentially required
to increase the out-turn
to plot the chain lines
to indicate the accuracy of the survey work
to plot the offsets
Reduced bearing of a line is an angle between
east or west and the given line
north line and given line measured clockwise
given line and the part of the meridian whether N end or S end, lying adjacent to it.
north line and given line measured anticlockwise
If the chain line which runs along N-S direction is horizontal and the ground in E-W direction is sloping
it is possible to set offsets correctly on both sides.
it is not possible to set offsets correctly on west side
it is possible to set offsets correctly on east side
Permanent adjustments of a level are
6 in number
4 in number
2 in number
3 in number
An internal focussing type surveying telescope, may be focussed by the movement of
concave lens in the telescope
convex-lens in the telescope
objective glass of the telescope
plano-convex lens in the telescope.
A dumpy level was set up at mid-point between pegs A and B, 80 m apart and the staff readings were 1.32 and 1.56. When the level was set up at a point 10 m from A on BA produced, the staff readings obtained at A and B were 1.11 and 1.39. The correct staff reading from this set up at S should be
None of these.
The defect of a lens whereby rays of white light proceeding from a point get dispersed into their components and conveyed to various foci, forming a blurred and coloured image is known as
Tilt of the staff in stadia tacheometry increases the intercept if it is
towards the telescope pointing up-hill
away from the telescope pointing up-hill
away from the telescope pointing down hill
None of these.
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