The great circle which passes through the zenith, nadir and the poles, is known as
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The following points form a pair of homologous points:
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The necessary geometrical condition for triangulation adjustment is:
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If α is the observed altitude, the refraction correction in seconds, is
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The elevation of the star at elongation is obtained by
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For adjusting a quadrilateral whose both the diagonals are observed, the equations of conditions involved, are
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An imaginary line lying throughout the surface of ground and preserving a constant inclination to the horizontal is known as
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The angle of intersection of the two plane mirrors of an optical square is
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If the R.L. of a B.M. is 100.00 m, the back- sight is 1.215 m and the foresight is 1.870 m, the R.L. of the forward station is
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Dumpy level is most suitable when
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The angle between the direction of star and the direction of earth's axis of rotation is called
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For a well-conditioned triangle, no angle should be less than
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The point where a vertical line through the optical centre of the camera lens intersects the ground, is known as
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