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

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

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

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

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Surveying
Refraction correction

adds to the curvature correction
completely eliminates curvature correction
has no effect on curvature correction
partially eliminates curvature correction

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Surveying
Homologous points are

Corresponding points on the ground and photograph
Nodal points of the camera lens
Opposite corners of a photograph
Plumb points of stereo pair of photographs

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