330. Pick up the correct statement from the following :
A. to locate a gross error in bearing that may exist in controlled theodolite traverse, we may plot the traverse from each end. The traverse station having the same coordinates by each route is the one where the error lies
B. to locate a gross error in bearing, in a controlled traverse, we plot the traverse and the station through which perpendicular to sector of the closing line passes is the station at which the error was made
C. to locate a gross error due to taping in a controlled traverse, we plot the traverse to a convenient scale. The bearing of the closing error will be approximately the same as that of the leg in which the gross error consists
D. all the above.
331. Pick up the correct statement from the following :
A. the lines of sight while observing back sight and fore sight lie in the same horizontal plane
B. the staff readings are measurements made vertically downwards from a horizontal plane
C. the horizontal plane with reference to which staff readings are taken, coincides with the level surface through the telescope axis
D. all the above.
332. In levelling operation
A. when the instrument is being shifted, the staff must not be moved
B. when the staff is being carried forward, the instrument must remain stationary
C. both A and B
D. neither A nor B.
333. Pick up the correct statement from the following :
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. all the above.
334. A back sight
A. is always taken on a point of known elevation or can be computed
B. is added to the known level to obtain the instrument height
C. taken on an inverted staff is treated as negative
D. all the above.
335. Keeping the instrument height as 1 m, length of staff 4 m, the up gradient of the ground 1 in 10, the sight on the up slope must be less than
A. 25 cm
B. 20 m
C. 45 m
D. 10 m.
336. Keeping the instrument height as 1.5 m, length of staff 4 in, the slope of the ground as 1 in 10, the sight on the down-slope, must be less than
A. 30 m
B. 25 m
C. 20 m
D. 15 m.
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