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43.

Local attraction in compass surveying may exist due to

A.	incorrect levelling of the magnetic needle	B.	loss of magnetism of the needle
C.	friction of the needle at the pivot	D.	presence of magnetic substances near the instrument

44.

Normal tension is that pull which

A.	is used at the time of standardising the tape	B.	neutralizes the effect due to pull and sag
C.	makes the correction due to sag equal to zero	D.	makes the correction due to pull equal to zero

45.

Refraction correction

A.	completely eliminates curvature correction	B.	partially eliminates curvature correction
C.	adds to the curvature correction	D.	has no effect on curvature correction

46.

Select the correct statement.

A.	A contour is not necessarily a closed curve.	B.	A contour represents a ridge line if the concave side of lower value con¬tour lies towards the higher value contour.
C.	Two contours of different elevations do not cross each other except in case of an overhanging cliff.	D.	All of the above statements are correct.

47.

Select the correct statement.

A.	Contour interval on any map is kept constant.	B.	Direct method of contouring is cheap¬er than indirect method.
C.	Inter-visibility of points on a contour map cannot be ascertained.	D.	Slope of a hill cannot be determined with the help of contours.

48.

Select the incorrect statement.

A.	The true meridians at different places are parallel to each other.	B.	The true meridian at any place is not variable.
C.	The true meridians converge to a point in northern and southern hemispheres.	D.	The maps prepared by national survey departments of any country are based on true meridians.

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