Surveying

Q1: If S is the length of a subchord and R is the radius of simple curve, the angle of deflection between its tangent and sub-chord, in minutes, is equal to

A
573 S/R

B
573 R/S

C
171.9 S/R

D
1718.9 R/S

E
1718.9 S/R.

Q2: The bearings of the lines AB and BC are 146° 30' and 68° 30'. The included angle ABC is

A
102°

B
78°

C
45°

D
none of these.

Q3: Two concave lenses of 60 cm focal length are cemented on either side of a convex lens of 15 cm focal length. The focal length of the combination is

A
10 cm

B
20 cm

C
30 cm

D
40 cm

Q4: If L is the perimeter of a closed traverse, ΔD is the closing error in departure, the correction for the departure of a traverse side of length l, according to Bowditch rule, is

A

B

C

D
.

Q5: Closed contours of decreasing values towards their centre, represent

A
a hill

B
a depression

C
a saddle or pass

D
a river bed.

Q6: If h is the difference in level between end points separated by l, then the slope correction is . The second term may be neglected if the value of h in a 20 m distance is less than

A
m

B
1 m

C
2 m

D
3 m

Q7: One of the Lehmann's rules of plane tabling, is

A
location of the instrument station is always distant from each of the three rays from the known points in proportion to their distances

B
when looking in the direction of each of the given points, the instrument station will be on the right side of one and left side of the other ray

C
when the instrument station is outside the circumscribing circle its location is always on the opposite side of the ray to the most distant point as the inter-section of the other two rays

D
none of these.

Q8: The accuracy of measurement in chain surveying, does not depend upon

A
length of the offset

B
scale of the plotting

C
importance of the features

D
general layout of the chain lines.

Q9: If θ is the slope of the ground and l is the measured distance, the correction is

A
2l sin2 θ/2

B
2l cos2 θ/2

C
2l tan2 θ/2

D
2l cot2 θ/2.

Q10: The sensitiveness of a level tube decreases if

A
radius of curvature of its inner surface is increased

B
diameter of the tube is increased

C
length of the vapour bubble is increased

D
both viscosity and surface tension are increased.

Q11: The slope correction for a length of 30 m along a gradient of 1 in 20, is

A
3.75 cm

B
0.375 cm

C
37.5 cm

D
2.75 cm.

Q12: The main principle of surveying is to work

A
from part to the whole

B
from whole to the part

C
from higher level to the lower level

D
from lower level to higher level.

Q13: If arithmetic sum of latitudes of a closed traverse is ∑Lat and closing error in latitude is dx, the correction for a side whose latitude is l, as given by Transit Rule, is

A

B

C

D
none of these.

Q14: If θ is the vertical angle of an inclined sight, δ is the angle of tilt of the staff, the error

A

B

C

D
none of these.

Q15: Hydrographic surveys deal with the mapping of

A
large water bodies

B
heavenly bodies

C
mountaineous region

D
canal system

E
movement of clouds.

Q16: The radius of curvature of the arc of the bubble tube is generally kept

A
10 m

B
25 m

C
50 m

D
100 m

Q17: Keeping the instrument height as 1.5 m, length of staff 4 m, the slope of the ground as 1 in 10, the sight on the down-slope, must be less than

A
30 m

B
25 m

C
20 m

D
15 m

Q18: The limiting length of an offset does not depend upon

A
accuracy of the work

B
method of setting out perpendiculars

C
scale of plotting

D
indefinite features to be surveyed.

Q19: While viewing through a level telescope and moving the eye slightly, a relative movement occurs between the image of the levelling staff and the cross hairs. The instrument is

A
correctly focussed

B
not correctly focussed

C
said to have parallax

D
free from parallax.

Q20: Pick up the correct statement from the following :

A
the eyepiece plays no part in defining the line of sight

B
the diaphragm plays no part in defining the line of sight

C
the optical centre of the objective plays no part in defining the line of sight

D
none of these.

Q21: If arithmetic sum of latitudes of a closed traverse is ∑Lat and closing error in latitude is dx, the correction for a side whose latitude is l, as given by Transit Rule, is

A

B

C

D
none of these.

Q22: An imaginary line joining the points of equal elevation on the surface of the earth, represents

A
contour surface

B
contour gradient

C
contour line

D
level line

E
none of these.

Q23: The intercept of a staff

A
is maximum if the staff is held truly normal to the line of sight.

B
is minimum if the staff is held truly normal to the line of sight.

C
decreases if the staff is tilted away from normal

D
increases if the staff is tilted towards normal.

Q24: If the radius of a simple curve is R, the length of the chord for calculating offsets by the method of chords produced, should not exceed.

A
R/10

B
R/15

C
R/20

D
R/25.

Q25: For the construction of highway (or railway)

A
longitudinal sections are required

B
cross sections are required

C
both longitudinal and cross sections are required

D
none of these.

Q26: One of the tacheometric constants is additive, the other constant, is

A
subtractive constant

B
multiplying constant

C
dividing constant

D
indicative constant.

Q27: If f1 and f2 are the distances from the optical centre of a convex lens of focal length f to conjugate two points P1 and P2 respectively, the following relationship holds good

A
f = f1 + f2

B
f = (f1 + f2)

C

D
none of these.

Q28: ABCD is a regular parallelogram plot of land whose angle BAD is 60°. If the bearing of the line AB is 30°, the bearing of CD, is

A
90°

B
120°

C
210°

D
270°

Q29: In chain surveying field work is limited to

A
linear measurements only

B
angular measurements only

C
both linear and angular measurements

D
all the above.

Q30: Pick up the method of surveying in which field observations and plotting proceed simultaneously from the following

A
chain surveying

B
compass surveying

C
plan table surveying

D
tacheometric surveying.

Q31: Pick up the correct statement from the following:

A
the theodolite in which telescope can be rotated in vertical plane is called a transit

B
when the vertical circle is to the left of the telescope during observation, it is called to be in left face

C
when the vertical circle is to the right of the telescope during observation, it is called to be in right face

D
all the above.

Q32: The probable error of the adjusted bearing at the middle is

A
rn

B
rn

C
rn

D
rn.

Q33: In chain surveying tie lines are primarily provided

A
to check the accuracy of the survey

B
to take offsets for detail survey

C
to avoid long offsets from chain lines

D
to increase the number of chain lines.

Q34: If R is the radius of the main curve, θ the angle of deflection, S the shift and L the length of the transition curve, then, total tangent length of the curve, is

A
(R - S) tan θ/2 - L/2

B
(R + S) tan θ/2 - L/2

C
(R + S) tan θ/2 + L/2

D
(R - S) tan θ/2 + L/2

E
(R - S) cos θ/2 + L/2

Q35: The most reliable method of plotting a theodolite traverse, is

A
by consecutive co-ordinates of each station

B
by independent co-ordinates of each station

C
by plotting included angles and scaling off each traverse leg

D
by the tangent method of plotting.

Q36: The real image of an object formed by the objective, must lie

A
in the plane of cross hairs

B
at the centre of the telescope

C
at the optical centre of the eye-piece

D
anywhere inside the telescope.

Q37: Offsets are measured with an accuracy of 1 in 40. If the point on the paper from both sources of error (due to angular and measurement errors) is not to exceed 0.05 cm on a scale of 1 cm = 20 m, the maximum length of offset should be limited to

A
14.14

B
28.28 m

C
200 m

D
none of these.

Q38: Diopter is the power of a lens having a focal length of

A
25 cm

B
50 cm

C
75 cm

D
100 cm

E
125 cm

Q39: In quadrantal bearing system, back bearing of a line may be obtained from its forward bearing, by

A
adding 180°, if the given bearing is less than 180°

B
subtracting 180°, if the given bearing, is more than 180°

C
changing the cardinal points, i.e. substituting N for S and E for W and vice-versa

D
none of these.

Q40: Accuracy of 'fix' by two point problem, is

A
bad

B
good

C
not reliable

D
unique.

Q41: Pick up the correct statement from the following :

A
the tangent screw enables to give small movement under conditions of smooth and positive control

B
standing on the tripod is the levelling head or trib arch

C
the levelling screws are used to tilt the instrument so that its rotation axis is truly vertical

D
all the above.

Q42: For a closed traverse the omitted measurements may be calculated

A
length of one side only

B
bearing of one side only

C
both length and bearing of one side

D
length or bearing of adjacent side

E
all the above.

Q43: Pick up the correct statement from the following :

A
Box sextant is used for the measurement of horizontal angles

B
Cross staff is used for setting out right angles

C
Gradiometer is used for setting out any required gradient

D
Line ranger is used for locating intermediate stations on a survey line

E
All the above.

Q44: Pick up the correct statement from the following :

A
the apparent error on reversal is twice the actual error

B
the correction may be made equal to half the observed discrepancy.

C
the good results may be obtained from a defective instrument by reversing and taking the mean of two erroneous results

D
all the above.

Q45: If a 30 m chain diverges through a perpendicular distance d from its correct alignment, the error in length, is

A

B

C

D

E
.

Q46: True meridians are generally preferred to magnetic meridians because

A
these converge to a point

B
these change due to change in time

C
these remain constant.

D
None of these.

Q47: An ideal vertical curve to join two gradients, is

A
circular

B
parabolic

C
elliptical

D
hyperbolic

E
none of these.

Q48: The 'fix' of a plane table station with three known points, is bad if the plane table station lies

A
in the great triangle

B
outside the great triangle

C
on the circumference of the circumscribing circle

D
none of these.

Q49: A bearing of a line is also known as

A
magnetic bearing

B
true bearing

C
azimuth

D
reduced bearing

Q50: The difference of level between a point below the plane of sight and one above, is the sum of two staff readings and an error would be produced equal to

A
the distance between the zero of gradient and the foot of the staff

B
twice the distance between the zero of graduation and the foot of the staff

C
thrice the distance between the zero of graduation and the foot of the staff

D
none of the above.

Q51: For true difference in elevations between two points A and B, the level must be set up

A
at any point between A and B

B
at the exact mid point of A and B

C
near the point A

D
near the point B.


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