In levelling operation
-
if second reading is more than first, it represents a rise -
if first reading is more than second, it represents a rise -
if first reading is less than second, it represents a fall -
if second reading is less than first, it represents a fall -
both (b) and (c).
Short offsets are measured with
-
an ordinary chain -
an invar tape -
a metallic tape -
a steel tape.
Permanent adjustments of a level are
-
2 in number -
3 in number -
4 in number -
6 in number
The surface of zero elevation around the earth, which is slightly irregular and curved, is known as
-
mean sea level -
geoid surface -
level surface -
horizontal surface.
Pick up the correct statement from the following :
-
The directions of plumb lines suspended at different points in a survey are not strictly parallel -
In surveys of small extent, the effect of curvature may be ignored and the level surface of the earth is assumed as horizontal -
In surveys of large extent, the effect of curvature of the earth must be considered -
All the above.
The radius of a simple circular curve ism and length of its specified chord ism. The degree of the curve is
-
5.73° -
5.37° -
3.57° -
3.75°.
Correction per chain length oflinks along a slope of α radians, is
-
100 α2 -
100 α -
100 α3 -
100 α-1.
During levelling if back sight is more than foresight
-
The forward staff is at lower point -
The back staff is at lower point -
The difference in level, cannot be ascertained. -
none of these.
The representation of general topography of a very flat terrain is possible only
-
by drawing contours at large interval -
by drawing contours at small interval -
by giving spot levels at large interval -
by giving spot levels to salient features at close interval.
In geodetic surveys higher accuracy is achieved, if
-
curvature of the earth surface is ignored -
curvature of the earth surface is taken into account -
angles between the curved lines are treated as plane angles -
none of these.
While working on a plane table, the correct rule is :
-
Draw continuous lines from all instrument stations -
Draw short rays sufficient to contain the points sought -
Intersection should be obtained by actually drawing second rays -
Take maximum number of sights as possible from each station to distant objects.
Two contour lines, having the same elevation
-
cannot cross each other -
can cross each other -
cannot unite together -
can unite together.
The bearing of line AB isand angle ABC measured clockwise is28'. The bearing of BC is
-
27° 52' -
96° 58' -
148° 08' -
186° 58'
Determining the difference in elevation between two points on the surface of the earth, is known as
-
levelling -
simple levelling -
differential levelling -
longitudinal levelling.
Pick up the correct statement from the following
-
the contour lines having the same elevation cannot unite and continue as one line -
a contour can not end abruptly, but must ultimately close itself not necessarily within the limits of map. -
the direction of steepest slope at a point on a contour is at right angles to the contour -
all the above.
A transit is oriented by setting its vernier A to read the back azimuth of the preceding line. A back sight on the preceding transit station taken and transit is rotated about its vertical axis. The vernier A reads
-
azimuth of the forward line -
bearing of the. forward line -
back bearing of the forward line -
equal to 360°-azimuth of the forward line.
Contours of different elevations may cross each other only in the case of
-
an over hanging cliff -
a vertical cliff -
a saddle -
an inclined plane.
In case of a double line river, contours are
-
stopped at the banks of the river -
stopped at the edge of the river -
drawn across the water -
drawn by parabolic curves having their vertex at the centre of the water.
In case of a direct vernier scale
-
graduations increase in opposite direction in which graduations of the main scale increase -
smallest division is longer than smallest division of the main scale -
graduations increase in the same direction in which graduations of the main scale increase -
none of these.
A transit is oriented by setting its vernier A to read the back azimuth of the preceding line. A back sight on the preceding transit station taken and transit is rotated about its vertical axis. The vernier A reads
-
azimuth of the forward line -
bearing of the. forward line -
back bearing of the forward line -
equal to 360°-azimuth of the forward line.
Contours of different elevations may cross each other only in the case of
-
an over hanging cliff -
a vertical cliff -
a saddle -
an inclined plane.
The Trapezoidal rule of volumes V of an embankment divided into a number of sections equidistant D, is given by
-
-
-
V = [A1 + An + 2(A2 + A4 + ... + An - 1) + 4(A3 + A5 + ... + An - 2)] -
V = [A1 + An + 4(A2 + A4 + ... + An - 1) + 4(A3 + A5 + ... + An - 2)].
Tilt of the staff in stadia tacheometry increases the intercept if it is
-
away from the telescope pointing down hill -
towards the telescope pointing up-hill -
away from the telescope pointing up-hill -
none of these.
If deflection angles are measured in a closed traverse, the difference between the sum of the right-hand and that of the left hand angles should be equal to
-
0° -
90° -
180° -
360°
If + 0.grade meets - 0.grade and the rate of change of grade form distance is 0.the length of the vertical curve will be
-
600 m -
700 m -
800 m -
900 m -
1000 m
Resolving power of a telescope depends on
-
the diameter of the aperture -
the pupil aperture of the eye -
the diameter of the object glass -
all the above.
The method generally preferred to for contouring an undulating area, is
-
chain surveying -
plane table surveying -
tacheometrical surveying -
compass surveying.
To orient a plane table at a point with two inaccessible points, the method generally adopted, is
-
intersection -
resection -
radiation -
two point problem.
Locating the position of a plane table station with reference to three known points, is known as
-
intersection method -
radiation method -
resection method -
three point problem.
The included angles of a theodolite traverse, are generally measured
-
clockwise from the forward station -
anti-clockwise from the back station -
anti-clockwise from the forward station -
clockwise from the back station.
If the declination of the needle isW
-
each of the whole circle reckoning has to be micros by 10° -
in the quadrantal method, the correction is positive in the 1st and 3rd quadrants -
in the quadrantal method, the corrections is negative in 2nd and 4th quadrants -
all the above.
The combined effect of curvature and refraction over a distance L kilometres is
-
67.2 L2 mm -
76.3 L2 mm -
64.5 L2 mm -
none of these.
If D is the degree of the curve of radius R, the exact length of its specified chord, is
-
radius of the curve x sine of half the degree -
diameter of the curve x sine of half the degree -
diameter of the curve x cosine of half the degree -
diameter of the curve x tangent of half the degree.
Location of contour gradient for a high way is best set out from
-
ridge down the hill -
saddle down the hill -
bottom to the ridge -
bottom to the saddle.
Pick up the correct statement from the following :
-
with both handles in his left hand, the chain man throws out the chain with his right hand and the second chain man assists him to free it from knots -
the follower of the chaining operation should be more experienced than the leader -
at the end of the tenth chain length, the two chain men meet and the ten arrows are handed over to the leader -
all the above.
A level when set upm from peg A andm from peg B reads 2.on a staff held on A and 3.on a staff held on B, keeping bubble at its centre while reading. If the reduced levels of A and B are 283.m and 284.m respectively, the collimation error perm is
-
0.015 m -
0.030 m -
0.045 m -
0.060 m
Number of links per metre length of a chain are
-
2 -
5 -
8 -
10 -
20
If h1 and h2 are the differences in level between ground and the formation levels, m is the slope of the sloping sides. D is the distance between the cross sections then, prismoidal correction for a level section is
-
D/2m(h1 - h2) -
D/3m(h1 - h2) -
D/6m(h1 - h2)2 -
D/6m(h1 - h2)3 -
D/6m(h1 + h2)2
For taking offsets with an optical square on the right hand side of the chain line, it is held
-
by right hand upside down -
by left hand upright -
by right hand upright -
by left hand up side down.
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 east side -
it is possible to set offsets correctly on east side -
it is not possible to set offsets correctly on west side -
it is possible to set offsets correctly on both sides.
In a telescope the object glass of focal lengthcm, is located atcm from the diaphragm. The focussing lens is midway between them when a staff 16.m away is focussed. The focal length of the focussing lens, is
-
5.24 cm -
6.24 cm -
7.24 cm -
8.24 cm
If the whole circle bearing of a line is 270°, its reduced bearing is
-
N 90° W -
S 90° W -
W 90° -
90° W.
Themm markings on a levelling staff placed atm are separated by
-
radian -
radian
-
radian
-
radian.
Number of links per metre length of a chain are
-
2 -
5 -
8 -
10 -
20
Themm markings on a levelling staff placed atm are separated by
-
radian
-
radian
-
radian
-
radian.
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 east side -
it is possible to set offsets correctly on east side -
it is not possible to set offsets correctly on west side -
it is possible to set offsets correctly on both sides.
Themm markings on a levelling staff placed atm are separated by
-
radian
-
radian
-
radian
-
radian.