bridge carrying railway below road

bridge carrying road below railway

bridge carrying road and railway at the same level

a level crossing.

embankment on the centre line

excavation on the centre line

earth work on the centre line

none of these.

positive compensating error

negative compensating error

positive cumulative error

negative cumulative error.

linear measurements only

angular measurements only

both linear and angular measurements

none of these.

line of sight is horizontal

axis of the telescope is horizontal

line of collimation is horizontal

geometrical axis of the telescope is horizontal.