Pick up the correct statement from the following 1 second of arc corresponds to

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Question
Pick up the correct statement from the following
Options
A. 1 second of arc corresponds to a displacement ratio of 1:206, 300
B. 1 degree of arc corresponds to a displacement ratio of 1:57
C. the angular errors tend to propagate themselves along a traverse as the square root of the number of stations
D. the errors arising from the linear measures tend to be roughly proportional to the lengths of the lines
E. all the above.

Correct Answer

all the above.

Surveying problems

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1. The operation of resection involves the following steps
1. rough orientation of the plane table
2. the three lines form a triangle of error
3. drawing lines back through the three control points
4. select a point in the triangle of error such that each ray is equally rotated either clockwise or anti clockwise
5. the points obtained by three rays is the correct location.
The correct sequence is
Options
A. 1, 3, 2, 4, 5
B. 1, 2, 3, 4, 5
C. 1, 4, 3, 2, 5
D. 1, 4, 2, 3, 5

2. If a linear traverse follows a sharp curve round a large lake where it is difficult to have long legs, the accuracy of the traverse may be improved by
Options
A. taking short legs
B. making repeated observations of angular and linear measurements
C. making a subsidiary traverse to determine the length of a long leg
D. all the above.

4. You have to observe an included angle with better accuracy than what is achievable by a vernier, you will prefer the method of
Options
A. repetition
B. reiteration
C. double observations
D. exactness.

6. Check lines (or proof lines) in Chain Surveying, are essentially required
Options
A. to plot the chain lines
B. to plot the offsets
C. to indicate the accuracy of the survey work
D. to increase the out-turn

8. A sewer is laid from a manhole A to a manhole B, 250 m away along a gradient of 1 in 125. If the reduced level of the invert at A is 205.75 m and the height of the boning rod is 3 m, the reduced level of the sight rail at B, is
Options
A. 208.75 m
B. 202.75 m
C. 206.75 m
D. 211.75 m

9. For locating a distant object visible from two transit stations, the method usually preferred to, is
Options
A. Angles and distances from transit stations
B. Angles from two transit stations
C. distance from two transit stations
D. Angle from one transit station and distance from the other.

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