Basic Surveying

Chain surveying is well adopted for

• Small areas in open ground

• Small areas with crowded details

• Large areas with simple details

• Large areas with difficult details

Two contour lines, having the same elevation

• Cannot cross each other

• Can cross each other

• Cannot unite together

• Can unite together

Which of the following statements is incorrect?

• Error due to refraction may not be completely eliminated by reciprocal levelling

• Tilting levels are commonly used for precision work

• The last reading of levelling is always a foresight

• All of the above statements are incorrect

In levelling operation,

• The first sight on any change point is a back sight

• The second sight on any change point is a fore sight

• The line commences with a fore sight and closes with a back sight

• The line commences with a back sight and closes with a foresight

While working on a plane table, the correct rule is:

•  Draw continuous lines from all instrument stations

• Draw short rays sufficient to contain the points sought

• Intersection should be obtained by actually drawing second rays

• Take maximum number of sights as possible from each station to distant objects

The vertical angle between longitudinal axis of a freely suspended magnetic needle and a horizontal line at its pivot, is known

• Declination

• Azimuth

• Dip

• Bearing

The area of any irregular figure of the plotted map is measured with

• Pentagraph

• Sextant

• Clinometer

• Planimeter

Surveys which are carried out to provide a national grid of control for preparation of accurate maps of large areas are known

• Plane surveys

• Geodetic surveys

• Geographical surveys

• Topographical surveys

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

• Bench mark

• Datum point

•  Reduced level

• Reference point

Surveys which are carried out to provide a national grid of control for preparation of accurate maps of large areas are known

• Plane surveys

• Geodetic surveys

• Geographical surveys

• Topographical surveys