Surveying
A plate parallel is the line on the plane of the negative

Parallel to the principal line
Perpendicular to the principal line
None of these
Along the bisector of the angle between the principal line and a perpendicular line through principal plane

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Surveying
If altitude bubble is provided both on index frame as well as on telescope of a theodolite, then the instrument is levelled with reference toi) altitude bubble on index frameii) altitude bubble on index frame if it is to be used as a leveliii) altitude bubble on telescopeiv) altitude bubble on telescope if it is to be used as a levelThe correct answer is

both (i) and (iv)
only (i)
only (iii)
both (ii) and (iii)

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