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 level The correct answer is

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

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Surveying
The meridian of a place is

A semi-circle which passes through the place and is terminated at the poles
A great circle passing through the place and the poles
An arc of the great circle which passes through the place and is perpendicular to the equator
A great circle whose plane is perpendicular to the axis of rotation and it also passes through the place

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Surveying
Which of the following errors can be eliminated by taking mean of bot face observations ?

error due to imperfect adjustment of plate levels
error due to line of collimation not being perpendicular to horizontal axis
error due to eccentricity of verniers
error due to imperfect graduations

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