# Civil Engineering Objective Questions { Surveying }

239. The method of finding out the difference in elevation between two points for eliminating the effect of curvature and refraction, is

240. A uniform slope was measured by the method of stepping. If the difference in level between two points is 1.8 m and the slope distance between them is 15 m, the error is approximately equal to

241.  A standard steel tape of length 30 m and cross-section 15 x 1.0 mm was standardised at 25?C and at 30 kg pull. While measuring a base line at the same temperature, the pull applied was 40 kg. If the modulus of elasticity of steel tape is 2.2 x 106 kg/cm2, the correction to be applied is

242. The bearing of AB is 190' and that of CB is 260? 30'.The included angle ABC, is

243. 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 B should be

244. The desired sensitivity of a bubble tube with 2 mm divisions is 30". The radius of the bubble tube should be

245. Offsets are measured with an accuracy of 1 in 40. If the point on the paper from both sources of error (due to angular and measurement errors) is not to exceed 0.05 cm on a scale of 1 cm =20 m, the maximum length of offset should be limited to

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