301. If h1 and h2 are the differences in level between ground and the formation levels, m is the slope of the sloping sides. D is the distance between the cross sections then, prismoidal correction for a level section is
302. In a telescope the object glass of focal length 14 cm, is located at 20 cm from the diaphragm. The focussing lens is midway between them when a staff 16.50 m away is focussed. The focal length of the focussing lens, is
303. The line normal to the plumb line is known as
304. The angle of intersection of a curve is the angle between
305. Planimeter is used for measuring
306. In a perfect prismatic compass
307. The defect of a lens whereby rays of white light proceeding from a point get dispersed into their components and conveyed to various foci, forming a blurred and coloured image is known as
308. The staff reading at a distance of 80 m from a level with the bubble at its centre is 1.31 m. When the bubble is moved by 5 divisions out of the centre, the reading is 1.39 m. The angular value of the one division of the bubble, is
309. If i is the stadia distance, f is the focal length and d is the distance between the objective and vertical axis of the techeometer, the multiplying constant, is
310. The back staff reading on a B.M. of R.L. 500.000 m is 2.685 m. If foresight reading on a point is 1.345 m, the reduced level of the point, is
311. It is more difficult to obtain good results while measuringhorizontal distance by stepping
312. The additional lines which are measured to show the correctness of the chain surveying are called:
313. If deflection angles are measured in a closed traverse, the difference between the sum of the right-hand and that of the left hand angles should be equal to
314. Locating the position of a plane table station with reference to three known points, is known as
315. If D is the degree of the curve of radius R, the exact length of its specified chord, is
316. Correction per chain length of 100 links along a slope of α° is
317. If the chain line which runs along N-S direction is horizontal and the ground in E-W direction is sloping
318. If Δ is the angle of deflection of a simple curve of radius R, the length of its long chord, is
319. In geodetic surveys higher accuracy is achieved, if
320. Determining the difference in elevation between two points on the surface of the earth, is known as
321. Contours of different elevations may cross each other only in the case of
322. Permanent adjustments of a level are
323. The radius of a simple circular curve is 300 m and length of its specified chord is 30 m. The degree of the curve is
324. During levelling if back sight is more than foresight