zero on back station

180 Degree on back station

90 Degree

270 Degree on back station.

reciprocal levelling

precise levelling

differential levelling

flying levelling

gradually decrease of curvature from zero at the tangent point to the specified quantity at the junction of the transition curve with main curve

gradual increase of super-elevation from zero at the tangent point to the specified amount at the junction of the transition curve with main curve

gradual change of gradient from zero at the tangent point to the specified amount at the junction of the transition curve with main curve

none of these.

bearing

magnetic declination

dip

convergence.

away from the telescope pointing down hill

towards the telescope pointing up-hill

away from the telescope pointing up-hill

none of these.