Surveying
Pick up the correct statement from the following. The difference between the longitudes of the places is obtained.

By subtracting the sum of their longitudes exceeding 180° from 360° if places are in different hemispheres
All of these
By subtracting their longitudes if places are in the same hemisphere
By adding their longitudes if places are in the different hemispheres

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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 level The correct answer is

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

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Surveying
The error due to eccentricity of inner and outer axes can be eliminated by

taking mean of several readings distributed over different portions of the graduated circle
double sighting
taking both face observations and taking the mean of the two
reading both verniers and taking the mean of the two

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