147) A dumpy level is set up with its eye-piece vertically over a peg A. The height from the top of peg A to the centre of the eye-piece is 1.540 m and the reading on peg B is 0.705 m. The level is then setup over B. The height of the eye-piece above peg B is 1.490 m and a reading on A is 2.195 m. The difference in level between A and B is

148) Probable systematic error in precise levelling as recommended by International Geodetic Association should not exceed (where k is in kilometers.)

149) Surveys which are carried out to depict mountains, rivers, water bodies, wooded areas and other cultural details, are known as

150) An angle of deflection right, may be directly obtained by setting the instrument to read

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