An angles of 45� with a chain line may be set out with optical square open cross

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Question
An angles of 45� with a chain line may be set out with
Options
A. optical square
B. open cross staff
C. Fench cross staff
D. prismatic square.

Correct Answer

Fench cross staff

Surveying problems

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2. Pick up the correct statement from the following :
Options
A. an observation or the resulting reading with the level on a levelling staff is called sight
B. a back sight is the first sight taken after setting up the instrument in any position
C. the first sight on each change point is a fore sight
D. the second sight on each change point is a back sight
E. all the above.

3. In a precision traverse, included angles are measured by setting the vernier
Options
A. to read zero exactly on back station
B. to read 5� exactly on back station
C. some where near zero and reading both verniers on back station
D. all the above.

4. A dumpy level was set up at mid-point between pegs A and B, 80 m apart and the staff readings were 1.32 and 1.56. When the level was set up at a point 10 m from A on BA produced, the staff readings obtained at A and B were 1.11 and 1.39. The correct staff reading from this set up at S should be
Options
A. 1.435
B. 1.345
C. 1.425
D. none of these.

5. While surveying a plot of land by plane tabling, the field observations
Options
A. and plotting proceed simultaneously
B. and plotting do not proceed simultaneously
C. and recorded in field books to be plotted later
D. all the above.

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