Engineering :: Surveying

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161.

An arbitrary surface with reference to which the elevation of points are measured and compared, is called

A.	datum surface	B.	level surface
C.	horizontl surface	D.	vertical surface

162.

A line normal to the plumb line at all points is known as

A.	horizontal line	B.	vertical line
C.	level line	D.	line of collimation

163.

A vertical line at any point is a line normal to the level surface at the point.

Yes

164.

The vertical distance above or below the datum is called

A.	reduced level of the point	B.	elevation of the point
C.	height of the instrument	D.	either (a) or (b)

165.

The height of instrument is the height of the centre of the telescope above the ground where the level is set up.

True

False

166.

A back sight indicates the

A.	shifting	B.	setting up
C.	height

167.

The point on which the instrument is set up, is called station point

True

False

168.

A fixed point of reference of known elevation is called

A.	change point	B.	station point
C.	bench mark	D.	datum

169.

An imaginary line tangential to the longitudinal curve of the bubble tube at its middle point is called

A.	axis of telescope	B.	axis of level tube
C.	level line	D.	line of collimation

170.

A staff reading taken on a bench mark or a point of known elevation is called

A.	fore sight reading	B.	back sight reading
C.	intermediate sight	D.	any one of these