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71.

The angle between the reflecting surfaces of a prism square is

A.	30?	B.	45?
C.	60?	D.	75?

72.

The obstacle, which obstructs vision but not chanining, is a

A.	river	B.	pond
C.	hill	D.	all of these

73.

The obstacle, which obstructs chaining but not vision, is a

A.	river	B.	hill
C.	rising ground	D.	all of these

74.

The building is an example of obstacle in which chaining and vision are both obstructed.

Correct

Incorrect

75.

In a prismatic compass, the zero of the graduated ring is located at

A.	north end	B.	south end
C.	east end	D.	west end

76.

The true or geographical meridiams through the various stations

A.	are parallel	B.	converge to the poles
C.	converge from north pole to south pole	D.	converge from south pole to north pole

77.

The direction of a true meridian at a station is invariable.

Right

Wrong

78.

The line in which the plane passing through the given point and the north and south poles intersects the surface of the earth, is called

A.	arbitrary meridian	B.	magnetic meridian
C.	true meridian	D.	none of these

79.

In a whole circle system, the bearing of a line is measured

A.	always clockwise from the south point of the reference meridian towards the line right round the circle	B.	clockwise or anticlockwise from the east or west whichever is nearer the line towards north or south
C.	clockwise or anticlockwise from the north or south whichever is nearer the line towards east or west	D.	none of the above

80.

In a duadrantal system, the bearing of a line is measured

A.	always clockwise from the south point of the reference meridian towards the line right round the circle	B.	clockwise or anticlockwise from the east or west whichever is nearer the line towards north or south
C.	clockwise or anticlockwise from the north or wouth whichever is nearer the line towards east or west	D.	none of the above