In levelling, the correction for combined curvature and refraction (in metres) is equal to

Related MCQs

• When the effect of refraction is taken into account in levelling, the true staff reading is obtained by subtracting the correction for refraction from the observed staff reading.
• In levelling, the correction for curvature (in metres) is equal, where D = Distance from the level to the staff reading in kilometres.
• Combined correction for curvature and refraction for 800 m distance is……
• In levelling, the effect of refraction may be taken as
• In levelling, the effect of refraction varies with the atmospheric conditions
• As applied to staff readings, the corrections for curvature and refraction are respectively The above table shows a part of a level field book. The value of X should be
• The method of finding out the difference in elevation between two points for eliminating the effect of curvature and refraction, is
• Refraction correction
• Correction required for refraction for a distance of 10 km is….
• When the effect of curvature is taken into account in levelling, the true staff reading is obtained by