51.When 1 cm on a map represents 10 M on the ground , the representative fraction of the scale is ?
- 1/10
- 1/100
- 1/1000
- 1/10000.
52.In measuring horizontal angles, the theodolite should be turned ?
- clockwise from the forward station to the back station
- clockwise from the back station to the forward station
- anticlockwise from the forward station to the back station
- anticlockwise from the forward station to the back station.
53.When the centres of the arcs lie on the opposite sides of the common tangent at the junction the two curves, it is known as a ?
- simple curve
- vertical curve
- compound curve
- reverse curve.
54.In the surveying telescope, diaphragm is held ?
- inside the eye piece
- inside the objective
- nearer to the eye piece
- nearer to the objective.
55.When the cross-hairs are not clearly visible ?
- the cross-hairs should be adjusted
- the eye-piece should be focussed
- the objective should be focussed
- the parallex should be removed.
56.The angle of field of the telescope ?
- is independent of the size of the object glass
- increases as the size of the eye piece increases
- decreases as the distance between eye piece and object increases
- all of the above.
57.The instrument, belonging to a class of reflecting instrument, is ?
- line ranger
- box sextent
- prismatic compass
- all of these.
58.A base line in a chain survey ?
- checks the accuracy of the framework
- enables the surveyor to locate the interior details which are far away from the main chain lines
- fixes up the directions of all other lines
- all of the above.
59.The operation of turning the table so that all the lines on the paper are parallel to the corresponding lines on the ground, is called ?
- levelling
- centering
- setting
- orientation.
60.In order to measure a horizontal angle more accurately than a vernier, a ?
- method of repetition is used
- method of reiteration is used
- method of deflection angles is used
- method of double observations is used.
61.A fixed point of reference of known elevation is called ?
- change point
- station point
- bench mark
- datum.
62.The error in measured length due to incorrect holding of chain is ?
- compensating error
- cumulative error
- instrumental error
- negative error.
63.The limiting length of the offset is............. when its perpendicular direction is set out by eye ?
- 5 m
- 10 m
- 15 m
- 20 m.
64.A reverse curve consists of ?
- a single curve of a circle connecting two straights
- two arcs of different radii bending in the same direction
- two arcs of equal radii bending in the same direction
- two arcs of equal or different radii bending in the opposite directions
65.In order to determine the natural features such as valleys, rivers, lakes etc., the surveying preferred is ?
- city surveying
- location surveying
- cadastral surveying
- topographical surveying
66.The vertical distance above or below the datum is called ?
- reduced level of the point
- elevation of the point
- height of the instrument
- either (a) or (b)
67.The index glass in an optical square is ?
- wholly silvered
- wholly unsilvered
- one-fourth silvered and three-fourth unsilvered
- half silvered and half unsilvered
68.The rise and fall method for obtaining the reduced levels of points provides a check on ?
- fore sights only
- back sights only
- intermediate sights only
- all of these
69.An angle made by a survey line with the prolongation of the proceeding line, is known as ?
- direct angle
- vertical angle
- horizontal angle
- deflection angle
70.The method of intersection in plane tabling is commonly used for ?
- locating the distant and inaccessible points
- locating the broken boundaries
- locating the points which may be used subsequently as the instrument stations
- all of the above.
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