Section 2 Flashcards
An ideal transition curve is
A. cubic parabola
B. cubic spiral
C. clothoid spiral
D. true spiral
C. clothoid spiral
Pantagraph is used for
A. measuring distances
B. measuring areas
C. enlarging or reducing plans
D. setting out right angles
C. enlarging or reducing plans
If the angular measurements of a traverse are more
precise than its linear measurements, balancing of the
traverse, is done by
A. Bowditch’s rule
B. Transit rule
C. Empirical rule
D. all of the above
B. Transit rule
The branch of surveying in which both horizontal and
vertical positions of a point, are determined by making
instrumental observations, is known
A. tacheometry
B. tachemetry
C. telemetry
D. all the above
D. all the above
In levelling operation
A. when the instrument is being shifted, the staff must not
be moved
B. when the staff is being carried forward, the instrument
must remain stationary
C. both (a) and (b)
D. neither (a) nor (b)
C. both (a) and (b)
If the rate of gain of radial acceleration is 0.3 m per
sec3
and full centrifugal ratio is developed. On the curve the
ratio of the length of the transition curve of same radius on
road and railway, is
A. 2.828
B. 3.828
C. 1.828
D. 0.828
A. 2.828
The angle between two plane mirrors of optical square, is
A. 20°
B. 30°
C. 45°
D. 60°
E. 90°
C. 45°
The latitude of a traverse leg is obtained by multiplying its
length by
A. tangent of its reduced bearing
B. sign of its reduced bearing
C. cosine of its reduced bearing
D. cosecant of its reduced bearing
C. cosine of its reduced bearing
For a curve of radius 100 m and normal chord 10 m, the
Rankine’s deflection angle, is
A. 0°25’.95
B. 0°35’.95
C. 1°25’.53
D. 1°35’.95
E. 2°51’.53
E. 2°51’.53
A uniform slope was measured by the method of
stepping. If the difference in level between two points is 1.8
m and the slope distance between them is 15 m, the error is
approximately equal to
A. cumulative, + 0.11 m
B. compensating, ± 0.11 m
C. cumulative, - 0.11 m
D. none of these
A. cumulative, + 0.11 m
In optical reading instruments
A. the vertical circle is usually continuous from 0° to 359°
B. the readings increase when the telescope is elevated in
the face left position
C. the readings decrease when the telescope is elevated in
the face right position
D. all the above
D. all the above
For setting out a simple curve, using two theodolites.
A. offsets from tangents are required
B. offsets from chord produced are required
C. offsets from long chord are required
D. deflection angles from Rankine’s formula are required
E. none of these
E. none of these
Geodetic surveying is undertaken
A. for production of accurate maps of wide areas
B. for developing the science of geodesy
C. making use of most accurate instruments and methods of
observation
D. for determination of accurate positions on the earth’s
surface of system of control points
E. all the above
E. all the above
The desired sensitivity of a bubble tube with 2 mm
divisions is 30”. The radius of the bubble tube should be
A. 13.75 m
B. 3.44 m
C. 1375 m
D. none of these
A. 13.75 m
A dumpy level was set up at the midpoint between two
pegs A and B, 50 m apart and the staff readings
at A and B were 1.22 and 1.06. With the level set up a A, the
readings at A and B were 1.55 and 1.37. The collimation
error per 100 m length of sight is
A. 0.02 m inclined upwards
B. 0.04 m inclined downwards
C. 0.04 m inclined upward
D. none of these
B. 0.04 m inclined downwards
Keeping the instrument height as 1 ½ m, length of staff 4
m, the up gradient of the ground 1 in 10, the sight on the up
slope must be less than
A. 25 cm
B. 20 m
C. 45 m
D. 10 m
C. 45 m
True meridian of different places
A. converge from the south pole to the north pole
B. converge from the north pole to the south pole
C. converge from the equator to the poles
D. run parallel to each other
C. converge from the equator to the poles
Let angular value of one graduation of a tube of
length x be φ seconds and R be the radius of its internal
curved surface, then
a. φ = x/206265R
b. φ = R/206265x
c. φ = 206265/x.R
d. φ = x.R/206265
a. φ = x/206265R
Pick up the correct statement from the following :
A. the length of the brass handle is included in the length of
chain
B. the handles are on swivel joints to prevent twisting of the
chain
C. the fifth tag from either end of the chain is numbered 5
D. the length of the Gunter’s chain is 66 ft.
E. all the above
E. all the above
Two hill tops A and B 20 km apart are intervened by a
third top C. If the top most contour of the three hill tops are
of the same value, state whether the line of sight AB
A. passes clear of hill top C
B. passes below the hill top C
C. grazes the hill top C
D. none of these
B. passes below the hill top C
The diaphragm of a stadia theodolite is fitted with two
additional
A. horizontal hairs
B. vertical hairs
C. horizontal and two vertical hairs
D. none of these
A. horizontal hairs
Centering error of a theodolite produces an error
A. in all angles equally
B. which does not vary with the direction or pointing
C. which varies with the direction of pointing and inversely
with the length of sight
D. none of these
C. which varies with the direction of pointing and inversely
with the length of sight
In levelling operation
A. if second reading is more than first, it represents a rise
B. if first reading is more than second, it represents a rise
C. if first reading is less than second, it represents a fall
D. if second reading is less than first, it represents a fall
E. both (b) and (c)
E. both (b) and (c)
A tape of length l and weight W kg/m is suspended at its
ends with a pull of P kg, the sag correction is ?
a. L³W²/24P²
Pick up the correct statement from the following :
A. in astronomical telescope, the rays from the object after
refraction at the objective are brought to a focus before
entering the eyepiece to produce a real inverted image in
front of the eye piece
B. in Galileo’s telescope, the rays from the object get
refracted at the objective and are intercepted by the
eyepiece before a real image is formed
C. a line passing through the optical centre of the objective
traversing through the eyepiece, is called line of sight
D. the line of sight which passes through the intersection of
cross-lines marked on a diaphragm fixed in front of the
eyepiece in a plane at right-angles to the axis, is called the
line of collimation
E. all the above
E. all the above
The operation of making the algebraic sum of latitudes
and departures of a closed traverse, each equal to zero, is
known
A. balancing the sights
B. balancing the departures
C. balancing the latitudes
D. balancing the traverse
D. balancing the traverse
If the sight distance (S) is equal to the length of the
vertical-curve (2l) joining two grades g1% and - g2%, the
height of the apex will be
b. (g1-g2)/400
Orientation of a plane table by solving two point
problem is only adopted when
A. saving of time is a main factor
B. better accuracy is a main factor
C. given points are inaccessible
D. none of these
C. given points are inaccessible
A back sight
A. is always taken on a point of known elevation or can be
computed
B. is added to the known level to obtain the instrument
height
C. taken on an inverted staff is treated as negative
D. all the above
D. all the above
If the area calculated form the plan plotted with
measurements by an erroneous chain, accurate area of the
plan is
d. measured area × (length of chain used/nominal chain length)²
The sum of the interior angles of a geometrical figure
laid on the surface of the earth differs from that of the
corresponding plane figure only to the extent of one second
for every
A. 100 sq. km of area
B. 150 sq. km of area
C. 200 sq. km of area
D. none of these
C. 200 sq. km of area
The systematic errors which persist and have regular
effects in the performance of a survey operation, are due to
A. carelessness
B. faulty instrument
C. inattention
D. none of these
B. faulty instrument
It θ is the probable error of an observed bearing of a line
of length l, the error over the whole length of the traverse
of n lines of length l is
A. ln
The best method of interpolation of contours, is by
A. estimation
B. graphical means
C. computation
D. all of these
C. computation
Pick up the correct specification of Ramsden eyepiece
from the following :
A. it consists of two equal piano convex lenses
B. the curved surfaces of plano-convex lenses face each
other
C. the two lenses are separated by a distance equal to 2/3 of
the focal length of either lens.
D. the distance between the diaphragm and the front lens of
the eyepiece is kept equal to 1/4 th of the focal length of a
lens so that rays from a point on the diaphragm enter the
eye as a parallel beam
E. all the above
E. all the above
The conventional sign shown in below figure represents a
A. bridge carrying railway below road
B. bridge carrying road below railway
C. bridge carrying road and railway at the same level
D. a level crossing
A. bridge carrying railway below road
Deviation of the actual road gradient from the proposed
contou’r gradient up hill side, involves
A. embankment on the centre line
B. excavation on the centre line
C. earth work on the centre line
D. none of these
B. excavation on the centre line
Measuring with a 30 m chain, 0.01 m too short,
introduces
A. positive compensating error
B. negative compensating error
C. positive cumulative error
D. negative cumulative error
C. positive cumulative error
Setting out a curve by two theodolite method, involves
A. linear measurements only
B. angular measurements only
C. both linear and angular measurements
D. none of these
B. angular measurements only
When the bubble of the level tube of a level, remains
central
A. line of sight is horizontal
B. axis of the telescope is horizontal
C. line of collimation is horizontal
D. geometrical axis of the telescope is horizontal
A. line of sight is horizontal
Pick up the correct statement from the following :
A. the power of a lens is the reciprocal of its focal length
B. the unit of power of the lens is diopter
C. the power of two or more thin lenses in contact is the
power of the combination of the lenses
D. all the above
D. all the above
The area of a plane triangle ABC, having its base AC and
perpendicular height h, is
a. ½bh
b. ½basinC
c. ½bcsinA
d. Heron’s Formula
e. All of the above
The vertical angle between longitudinal axis of a freely
suspended magnetic needle and a horizontal line at its pivot,
is known
A. declination
B. azimuth
C. dip
D. bearing
C. dip
A relatively fixed point of known elevation above datum,
is called
A. bench mark
B. datum point
C. reduced level
D. reference point
A. bench mark
Cross hairs in surveying telescopes, are fitted
A. in the objective glass
B. at the centre of the telescope
C. at the optical centre of the eye piece
D. in front of the eye piece
D. in front of the eye piece
Metric chains are generally available in
A. 10 m and 20 m length
B. 15 m and 20 m length
C. 20 m and 30 m length
D. 25 m and 100 m length
C. 20 m and 30 m length
On a diagonal scale, it is possible to read up to
A. one dimension
B. two dimensions
C. three dimensions
D. four dimensions
C. three dimensions
Plotting of inaccessible points on a plane table, is done
by
A. intersection
B. traversing
C. radiation
D. none of these
A. intersection
A dumpy level is set up with its eye-piece vertically over
a peg A. The height from the top of peg A to the centre of
the eye-piece is 1.540 m and the reading on peg B is 0.705
m. The level is then setup over B. The height of the eyepiece above peg B is 1.490 m and a reading on A is 2.195 m.
The difference in level between A and B is
A. 2.900 m
B. 3.030 m
C. 0.770 m
D. 0.785 m
E. 1.770 m
C. 0.770 m
Probable systematic error in precise levelling as
recommended by International Geodetic Association should
not exceed
(where k is in kilometers.)
A. ± 0.1 k mm
B. ± 0.2 k mm
C. ± 0.1 k
D. 0.2 k mm
D. 0.2 k mm
