Deck 6: Surveying and Mapping Techniques: Part B

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.

Answer 1

to avoid long offsets from chain lines

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.

Answer 2

1/ f₁ + 1/ 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.

Answer 3

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

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

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.

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.

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.

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.

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.

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.

Question 12

The best method of interpolation of contours, is by

A)estimation
B)graphical means
C)computation
D)all of these.

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.

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.

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.

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.

Question 17

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

A)intersection
B)traversing
C)radiation
D)none of these.

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

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.

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.

Question 21

Imaginary line passing through points having equal magnetic declination is termed as

A)isogon
B)agonic line
C)isoclinic line
D)none of these

Question 22

While measuring a chain line between two stations A and B intervened by a raised ground

A)vision gets obstructed
B)chaining gets obstructed
C)both vision and chaining get obstructed
D)all the above.

Question 23

A clinometer is used for

A)measuring angle of slope
B)correcting line of collimation
C)setting out right angles
D)defining natural features.

Question 24

The whole circle bearing of a line is 290°. Its reduced bearing is

A)N 20° E
B)N 20° W
C)N 70° W
D)S 70° E

Question 25

The reduced bearing of a line is N 87° W. Its whole circle bearing is

A)87°
B)273°
C)93°
D)3°