277. A level when set up 25 m from peg A and 50 m from peg B reads 2.847 on a staff held on A and 3.462 on a staff held on B, keeping bubble at its centre while reading. If the reduced levels of A and B are 283.665 m and 284.295 m respectively, the collimation error per 100 m is
278. For taking offsets with an optical square on the right hand side of the chain line, it is held
279. If the whole circle bearing of a line is 270°, its reduced bearing is
280. A lens or combination of lenses in which the following defect is completely eliminated is called aplanatic
281. While setting a plane table at a station it was found that the error in centering was 30 cm away from the ray of length 40 m drawn from the station. If the scale of the plan is 1 cm = 2 cm, the displacement of the end of the ray in plan from the true position will be
282. In precision theodolite traverse if included angles are read twice and the mean reading accepted using both verniers having a least count of 30". Assuming the instrument to be in perfect adjustment, linear measurements correct to 6 mm per 30 metre tape duly corrected for temperature, slope and sag, the angular error of closure not to exceed (where n is the number of traverse legs)
283. Straight, parallel and widely spaced contours represent
284. The theodolites used for making tacheometric observations by optical wedge system, are
285. Resolving power of a telescope depends on
286. If 50 m point of a 100 m tape is 50 cm off line, and 50 m sections are straight, an error is generated equal to
287. Which of the following is a pair of names of same game.?
288. The 10 mm markings on a levelling staff placed at 20 m are separated by
289. Staff readings on pegs x and y from X station are 1.755 m and 2.850 m, and from station Y on staff head at Y and X are 0.655 m and 1.560 m. If reduced level of X is 105.5 m, the reduced level of Y is
290. The constant vertical distance between two adjacent contours, is called
291. The reduced level of a floor is 99.995 m, the staff reading on the floor is 1.505 m. If the inverted staff reading against the roof is 1.795 m, the floor level below the slab, is
292. The correction to be applied to each 30 metre chain length along θ° slope, is
293. If F is the pull applied at the ends of tape in kg, l is the length of tape between end marks in metres, w is the weight of the tape in kg per metre run, then sag correction
294. Under ordinary conditions, the precision of a theodolite traverse is affected by
295. Stadia techeometry was discovered by James Watt in the year.
296. Who among the following is the author of the book ‘The Count of Monte Cristo’?
297. The properties of autogenous curve for automobiles are given by
298. If + 0.8% grade meets - 0.7% grade and the rate of change of grade for 30 m distance is 0.05, the length of the vertical curve will be
299. The included angles of a theodolite traverse, are generally measured
300. Location of contour gradient for a high way is best set out from