1. Select the most appropriate answer for each of the following questions

The following sights are taken on a turning point:

Fore sight only

Back sight only

Fore sight and Back sight

Fore sight and Intermediate sight

Geodetic survey is different from plane survey because of

undulations of the topography

coverage of very large area

the curvature of the Earth

the large difference of elevation between various points

The length of chain is measured from

centre of one handle to centre of other handle

outside of one handle to outside of other handle

outside of one handle to inside of other handle

inside of one handle to inside of other handle.

A fixed point of reference elevation is known as

Reduced level

Benchmark

Change Point

Instrument Station

If the plotted position of an instrument station is not known, the most accurate orientation of the plane table can be achieved by

Trough compass

Back sighting

Observation of two well-defined points

Observation of three well-defined points

The operation consisting of revolving the telescope through 1800 in a vertical plane about its horizontal axis is called

Transiting

Face left

Face right

Traversing

The whole circle bearing of a line is 60°. Its quadrantal bearing is

N 60° E

E 60° N

S 60° W

W 60° S

2. Briefly discuss the following:

Purpose of surveying.

Classification of survey based on the instruments used.

What is an offset Describe the offset method.

A survey map is required to be drawn to a scale of 1110,000 RF. A 20 m chain was used which was· found to be accurate at the commencement of work while 10 cm too long at the closure. The area of the plot surveyed was found to be 90 cm^2 on the map. Calculate the actual area of the plot.

Define the following:

Angle of dip

Magnetic Declination

Local Attraction

Magnetic Bearing

Explain the temporary adjustments of theodolite.

5. Describe Lehmann's Rule with the help of a neat sketch.

6. The following staff readings were observed with a level:
2.225, 1·605, 0.985, 2.090, 2·865, 1.260, 0·605, 1·985, 1.045, 2·685
the instrument having been moved after third, sixth and eighth readings. Enter the above readings in a page of a level book and· calculate the R.L. of the above points, if the first reading was taken with a staff held on a Bench Mark of R.L. 412·385 m.

What is the difference between a prismatic compass and a surveyor's compass?

Explain with a neat sketch the construction and working of a cross staff.