Most accurate method

Dumpy level is most suitable when

Many readings are to be taken from a single setting of the instrument

F

For accurate work, the steel band should always be used in preference to chain because the steel band

Is practically inextensible and is not liable to kinks when in use

For a well-conditioned triangle, no angle should be less than

Ordm;

Find a bearing for line AB if it lies in the first quadrant

r=α

Find a bearing for line AB if it lies in the second quadrant

r=180°-α

Find a bearing for line AB if it lies in the third quadrant

r=α-180°

Find a bearing for line AB if it lies in the forth quadrant

r=360°-α

For a line AB

The forbearing of AB and back bearing of AB differ by 180

For accurate work, the steel band should always be used in preference to chain because the steel band

Is practically inextensible and is not liable to kinks when in

For taking offsets with an optical square on the right hand side of the chain line, it is held

By left hand upright use

For a closed traverse the omitted measurements may be calculated

All the above

For which of the following permanent adjustments of theodolite, the spire test is used?

Adjustment of horizontal axis

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

At the exact midpoint of A and B

For a line AB

The forebearing of AB and back bearing of AB differ by 180

For the construction of highway (or railway)

Both longitudinal and cross sections are required

H

Height of instrument method of levelling is

Quicker and less tedious for large number of intermediate sights

How would a sink hole be identified on a topo map?

By contour lines with hachures

How are streams indicated on a topographic map?

by contour lines that form v's which point upstream

How many 7.5 minute quadrangles occur within a 15 minute sheet?

How many meters are there in one cm on a map if the scale is 1:24000?

How many meters are there in 2 cm on a map if the scale is 1:15000?

How are latitude and longitude lines drawn on a globe of Earth?

Latitude lines are parallel and longitude lines meet at the poles.

Height of the instrument method of levelling is

Quicker and less tedious for large number of intermediate sights

Hydrographic surveys deal with the mapping of

Large water bodies

I

If h is the difference in level between end points separated by l, then the slope correction is h2:2l+h4:8/3. The second term may be neglected if the value of h in a 20 m distance is less than

M

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

lx dx:E Lat

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

d2:60 x m

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

E= -1 cos (O+-b):cos O

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

treygD x l:L

In traverse computations, the sum of angles in closed figures equals which of the following? (number of sides is 4)

Ordm;

International date line is located along

Longitude

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