Question 1

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.

Accepted Answer

Tie lines are used to avoid long offsets from chain lines by providing additional reference points for measurements.

Question 2

If f₁ and f₂ are the distances from the optical center 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)1/ f₁ + 1/ f₂ D)none of these.

Accepted Answer

The correct relationship is based on the lens formula, which states that for a lens of focal length $f$, the relationship between the object distance ($u$) and the image distance ($v$) is given by $\frac{1}{f} = \frac{1}{v} + \frac{1}{u}$. When considering two different sets of conjugate points ($P_1$ and $P_2$), the sum of the reciprocals of their distances from the optical center (considering $v$ and $u$ for each set) equals the reciprocal of the focal length. This is represented by choice C: $1/f = 1/v_1 + 1/u_1 + 1/v_2 + 1/u_2$, which simplifies to the given correct option when considering the distances as $f₁$ and $f₂$.

Question 3

Closed contours of decreasing values towards their center, represent
A)a hill
B)a depression
C)a saddle or pass
D)a river bed.

Accepted Answer

Closed contours with decreasing values towards their center on a topographic map indicate a depression. This is because the contour lines represent areas of equal elevation, and as the values decrease towards the center, it suggests that the elevation is getting lower, characteristic of a depression.

Question 4

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

Accepted Answer

Contour lines are the imaginary lines that connect points of equal elevation on the surface of the Earth, representing the vertical dimension on a horizontal plane, such as on a map.

Question 5

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

Accepted Answer

Chain surveying primarily involves linear measurements, using chains or tapes to measure distances between points on the ground directly. Angular measurements are not a focus of chain surveying techniques.

Question 6

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.

Accepted Answer

In the quadrantal bearing system, the back bearing is obtained by changing the cardinal points, substituting N for S and E for W, and vice-versa.

Question 7

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.

Accepted Answer

Plan table surveying is a method where field observations and plotting are done simultaneously. This is achieved by using a plan table, a device that allows for the drawing of a map or plan directly in the field as observations are made.

Question 8

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 focused
B)not correctly focused
C)said to have parallax
D)free from parallax.

Accepted Answer

This relative movement indicates the presence of parallax, which occurs when the image of the levelling staff and the cross hairs are not in the same focal plane, leading to an apparent shift when the observer moves their eye.

Question 9

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.

Accepted Answer

True meridians remain constant, unlike magnetic meridians which can change due to shifts in the Earth's magnetic field. True meridians are defined by the geographic poles, providing a consistent reference for navigation and mapping.

Question 10

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.

Accepted Answer

The main principle of surveying is to work "from whole to the part." This approach helps in minimizing errors and ensures that any mistakes do not accumulate but are instead isolated and can be corrected more easily. By first establishing a framework of control points over the entire area (the whole), surveyors can then perform more detailed work within this framework (the part), ensuring accuracy and consistency throughout the survey.

Question 11

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)all the above.

Accepted Answer

Geodetic surveying is conducted for the production of accurate maps of wide areas, for advancing the science of geodesy, and it involves the use of the most accurate instruments and methods of observation.

Question 12

The best method of interpolation of contours, is by
A)estimation
B)graphical means
C)computation
D)all of these.

Accepted Answer

The answer of The best method of interpolation of contours,...

Question 13

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.

Accepted Answer

The answer of The conventional sign shown in below figure...

Question 14

A relatively fixed point of known elevation above datum, is called
A)bench mark
B)datum point
C)reduced level
D)reference point.

Accepted Answer

A bench mark is a point of known elevation from a specific datum, used as a reference point in surveying and construction to ensure elevations are measured accurately and consistently.

Question 15

Cross hairs in surveying telescopes, are fitted
A)in the objective glass
B)at the center of the telescope
C)at the optical center of the eye piece
D)in front of the eye piece.

Accepted Answer

Cross hairs in surveying telescopes are fitted in front of the eye piece to allow the surveyor to align the instrument accurately with the target.

Question 16

On a diagonal scale, it is possible to read up to
A)one dimension
B)two dimensions
C)three dimensions
D)Four dimensions.

Accepted Answer

A diagonal scale allows for the measurement of three dimensions: units, tenths, and hundredths.

Question 17

Plotting of inaccessible points on a plane table, is done by
A)intersection
B)traversing
C)radiation
D)none of these.

Accepted Answer

Intersection is used to plot inaccessible points by taking bearings from two known points.

Question 18

Prismatic compass is considered more accurate than a surveyor's compass, because
A)it is provided with a better magnetic needle
B)it is provided with a sliding glass in the object vane
C)its graduations are in whole circle bearings
D)it is provided with a prism to facilitate reading of its graduated circle

Accepted Answer

The prismatic compass is equipped with a prism that allows for more precise reading of the graduated circle, enhancing its accuracy compared to a surveyor's compass.

Question 19

Removal of parallax, may be achieved by focussing
A)the objective
B)the eye-piece
C)the objective and the eye-piece
D)none of these.

Accepted Answer

Parallax is eliminated by properly focusing both the objective and the eye-piece. This ensures that the image formed by the objective lens is exactly at the focal plane of the eyepiece, allowing for a clear and parallax-free view.

Question 20

In an internal focusing telescope
A)the objective is at a fixed distance from the diaphragm
B)the focusing is done by the sliding of a divergent lens.
C)the focusing divergent lens is situated at about the middle of the tube
D)all the above.

Accepted Answer

In an internal focusing telescope, all the statements are correct: the objective is at a fixed distance from the diaphragm, focusing is achieved by sliding a divergent lens, and this divergent lens is typically located around the middle of the tube. This design allows for focusing without altering the telescope's length.

Quiz 6: Surveying and Mapping Techniques: Part B

In chain surveying tie lines are primarily provided

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

Closed contours of decreasing values towards their center, represent

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

In chain surveying field work is limited to

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

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

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

True meridians are generally preferred to magnetic meridians because

The main principle of surveying is to work

Geodetic surveying is undertaken

The best method of interpolation of contours, is by

The conventional sign shown in below figure represents a

A relatively fixed point of known elevation above datum, is called

Cross hairs in surveying telescopes, are fitted

On a diagonal scale, it is possible to read up to

Plotting of inaccessible points on a plane table, is done by

Prismatic compass is considered more accurate than a surveyor's compass, because

Removal of parallax, may be achieved by focussing

In an internal focusing telescope

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