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

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

general layout of the chain lines

The limiting length of an offset does not depend upon

Indefinite features to be surveyed.

True meridians are generally preferred to magnetic meridians because

these remain constant.

The most reliable method of plotting a theodolite traverse, is

by independent co-ordinates of each station

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

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

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

102°

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

3.75 cm

The main principle of surveying is to work

from whole to the part

The probable error of the adjusted bearing at the middle is

1:2 R корень из n

The telescope of theodolite said to be inverted if its

Vertical circle is to its right and the bubble of the telescope is down

The horizontal angle between true meridian and magnetic meridian, is known

magnetic declination

The method of finding out the difference in elevation between two points for eliminating the effect of curvature and refraction, is

reciprocal levelling

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

273°

The total change in level along the line is equal to total back sights

all

The apparent error on reversal is

twice the actual error

Total latitude of a point is positive if it lies

north of the reference parallel

The constant vertical distance between two adjacent contours, is called

contour interval

The theodolites used for making tacheometric observations by optical wedge system, are

fitted with a glass wedge in front of telescope.

Tilt of the staff in stadia tacheometry increases the intercept if it is

away from the telescope pointing up-hill

The distance between contour lines on a topo map is called the

contour interval

The system of lines used to locate a certain place on Earth are called...

coordinate systems

Topographic contour lines that are closer together than other contour lines indicate what?

steeper slopes

Topographic maps that are bounded by lines of latitude and longitude are called

____________ maps.

quadrangle

The North end of the compass needle ALWAYS points toward what direction?

magnetic North

The index pin is used to adjust what feature on the Bruton compass?

the circular grid for magnetic declination

The difference between a level line and a horizontal line is that

level line is a curved line while hori-zontal line is a straight line

The difference of levels between two stations A and B is to be determined. For best results, the instrument station should be

equidistant from A and B

The temporary adjustments of a prismatic compass are i) Centering ii) Levelling iii) Focusing the prism The correct order is

(0, (ii), (iii)

The series of nearly, spaced contour lines represents a

steep slope

The error due to eccentricity of inner and outer axes can be eliminated by

reading both verniers and taking the mean of the two

The cross hairs in the surveying telescope are placed

much closer to the eye-piece than to the objective lens

The following sights are taken on a "turning point"

foresight and backsight

Theodolite is an instrument used for

measurement of both horizontal and vertical angles

The prismatic compass and surveyor's compass

give whole circle bearing (WCB) of a line and quadrantal bearing (QB) of a line respectively

The horizontal angle between the true meridian and magnetic meridian at a place is called

Declination

The angle of intersection of the two plane mirrors of an optical square is

45 º

The allowable length of an offset depends upon the

all of the above

The adjustment of horizontal cross hair is required particularly when the instrument is used for

Leveling

The process of turning the telescope about the vertical axis in horizontal plane is known as

$$swinging

The correction for sag is

always subtractive

The bearings of the lines AB and BC are 133° 30' and 49° 30'. The included angle ABC is

96°

The bearings of the lines AB and BC are 279° 20' and 186° 20'. The included angle ABC is

87°

The length of a chain is measured from

outside of one handle to outside of other handle

The maximum tolerance in a 20 m chain is

5 mm

The permissible error in chaining for measurement with chain on rough or hilly ground is

1 in 250

U

Under ordinary conditions, the precision of a theodolite traverse is affected by

systematic linear errors

Using the latitude and longitude system (degrees, minutes, seconds), 20 minutes is equal to what?

1/3º

W

Which reference line passes through both the geographic North Pole and the geographic South Pole?