In reciprocal levelling, the error which is not completely eliminated, is due to
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Match List-I with List-ll and select the correct answer using the codes given below the lists:
List-I
A. Reciprocal levelling
B. Trigonometrical levelling
C. Hypsometry
D. Profile levelling
List-ll
1. Involves measuring of horizontal distances and vertical angles in field
2. Involves the principle of boiling point of water variation with altitude
3. Involves observing elevations of a number of points along the centre line and their distance along it
4. Involves the principle of two peg test
The RL, of the point A which is on the floor is 100 m and back sight reading on A is 2.455 m. If the foresight reading on the point B which is one the ceiling is 2.745 m, the RL of point B will be
The following consecutive readings were taken with a dumpy level:
0.635, 1.525, 2.395, 0.605, 0.805, 0.125
The instrument was shifted after the third and fifth readings. The readings 2.395 and 0.635 respectively represents
A level was set up at a point A and distance to the staff station B was 100 m. The net combined correction due to curvature and refraction as applied to the staff reading is
An observer standing on the deck of a ship just sees the top of a lighthouse which is 30 m above the sea level. If the height of the observer’s eye is 10 m above the sea level, then the distance of the observer from the lighthouse will be nearly
If the staff intercept on a staff located at 100 m from the level for five division deviation of the bubble is 0.050 m and if the length of one division of the bubble is 2 mm, then the radius of curvature of the bubble tube is
Two points A and B are 1530 m apart across a river. The reciprocal levels measured are
The true difference in level between A and B would be
If the observed staff reading at a station is 800.925 m the correction due to refraction is 0.115 m and correction due to curvature is 0.805. Then the correct staff reading will be