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55.

The angle of intersection of the two plane mirrors of an optical square is

A.	30°	B.	45°
C.	60°	D.	90°

56.

The correction for sag is

A.	always additive	B.	always subtractive
C.	always zero	D.	sometimes additive and sometimes subtractive

57.

The cross hairs in the surveying telescope are placed

A.	midway between eye piece and objec¬tive lens	B.	much closer to the eye-piece than to the objective lens
C.	much closer to the objective lens than to the eye piece	D.	anywhere between eye-piece and objective lens

58.

The difference between a level line and a horizontal line is that

A.	level line is a curved line while hori-zontal line is a straight line	B.	level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line
C.	horizontal line is normal to plumb line while level line may not be normal to the plumb line	D.	both are same

59.

The difference of levels between two stations A and B is to be determined. For best results, the instrument station should be

A.	equidistant from A and B	B.	closer to the higher station
C.	closer to the lower station	D.	as far as possible from the line AB

60.

The error due to eccentricity of inner and outer axes can be eliminated by

A.	reading both verniers and taking the mean of the two	B.	taking both face observations and taking the mean of the two
C.	double sighting	D.	taking mean of several readings distributed over different portions of the graduated circle

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