61.
Check lines (or proof lines) in Chain Surveying, are essentially required
A
To plot the chain lines
B
To plot the offsets
C
To indicate the accuracy of the survey work
D
To increase the out-turn
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Check lines (or proof lines) in Chain Surveying, are essentially required
To plot the chain lines
To plot the offsets
To indicate the accuracy of the survey work
To increase the out-turn
To avoid large centering error with very short legs, observations are generally made
To chain pins
By using optical system for centering the theodolite
To a target fixed on theodolite tripod on which theodolite may be fitted easily
All the above
Contour interval is
The vertical distance between two consecutive contours
The horizontal distance between two consecutive contours
The vertical distance between two points on same contour
The horizontal distance between two points on same contour
In levelling operation,
The first sight on any change point is a back sight
The second sight on any change point is a fore sight
The line commences with a fore sight and closes with a back sight
The line commences with a back sight and closes with a foresight
The chord of a curve less than peg interval, is known as
Small chord
Sub-chord
Normal chord
Short chord
Chain surveying is well adopted for
Small areas in open ground
Small areas with crowded details
Large areas with simple details
Large areas with difficult details
The line of sight is kept as high above ground surface as possible to minimise the error in theobserved angles due to
Shimmering
Horizontal refraction
Vertical refraction
Both shimmering and horizontal refraction
The length of a traverse leg may be obtained by multiplying the latitude and
Secant of its reduced bearing
Sine of its reduced bearing
Cosine of its reduced bearing
Tangent of its reduced bearing
The two point problem and three point problem are methods of
Resection
Orientation
Traversing
Resection and orientation
In direct method of contouring, the process of locating or identifying points lying on a contour is called
Ranging
Centring
Horizontal control
Vertical control
Detailed plotting is generally done by
Radiation
Traversing
Resection
All of the above
Which of the following methods of theodolite traversing is suitable for locating the details whichare far away from transit stations?
Measuring angle and distance from one transit station
Measuring angles to the point from at least two stations
Measuring angle at one station and distance from other
Measuring distance from two points on traverse line
Volume of the earth work may be calculated by
Mean areas
End areas
Trapezoidal
All the above
For the construction of highway (or railway)
Longitudinal sections are required
Cross sections are required
Both longitudinal and cross sections are required
None of these
Subtense bar is an instrument used for
Levelling
Measurement of horizontal distances in plane areas
Measurement of horizontal distances in undulated areas
Measurement of angles
Hydrographic surveys deal with the mapping of
Large water bodies
Heavenly bodies
Mountainous region
Canal system
Contour interval is
Inversely proportional to the scale of the map
Directly proportional to the flatness of ground
Larger for accurate works
Larger if the time available is more
The line of collimation method of reduction of levels, does not provide a check on
Intermediate sights
Fore sights
Back sights
Reduced levels
The real image of an object formed by the objective must lie
In the plane of cross hairs
At the centre of the telescope
At the optical centre of the eye-piece
Anywhere inside the telescope
The line normal to the plumb line is known as
Horizontal line
Level line
Datum line
Vertical line