The method of surveying by triangulation was first introduced by the Dutchman Snell in

The necessary geometrical condition for triangulation adjustment is:

A

The sum of the angles around a station should be 360°

B

The sum of the three angles of a plane triangle should be 180°

C

The sum of the eight angles of a braced quadrilateral should be 360°

D

All the above

Triangulation surveys are carried out for locating

A

Control points for surveys of large areas

B

Control points for photogrammetric surveys

C

Engineering works, i.e. terminal points of long tunnels, bridge abutments, etc.

D

All the above

The station which is selected close to the main triangulation station, to avoid intervening obstruction, is not known as

A

Satellite station

B

Eccentric station

C

False station

D

Pivot station

In triangulation surveys

A

The area is divided into triangular figures

B

Control stations are located from which detailed surveys are carried out

C

Sides are not measured excepting the base line

D

All the above

Triangulation surveys are carried out for providing

A

Planimetric control

B

Height control

C

Both planimetric and height control

D

None of these

The station where observations are not made, but the angles at the station are used in triangulation series, is known as

A

Satellite station

B

Subsidiary station

C

Pivot station

D

Main station

Surveying tapes are made of a material having low coefficient of expansion and enough strength. The alloy used is

A

Silver metal

B

Duralumin

C

Hastelloy

D

Invar

These are special installations of stone or concrete marking the locations of points accurately determined by precise surveying:

A

Topographic marks

B

Hatches

C

Monuments

D

Pillars

Local attraction in compass surveying may exist due to

A

incorrect levelling of the magnetic needle

B

loss of magnetism of the needle

C

friction of the needle at the pivot

D

presence of magnetic substances near the instrument

Which of the following methods of plane table surveying is used to locate the position of an inaccessible point ?

A

radiation

B

intersection

C

traversing

D

resection

The method of surveying by triangulation was first introduced by the Dutchman Snell in

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