Surveying
The want of correspondence in stereo-photographs

Is a function of tilt
Is not affected by the change of flying height between photographs
Is a good property
Is minimum when θ is 3°

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Surveying
Which of the following errors cannot be eliminated by taking both face observations ?

error due to non-parallelism of the axis of telescope level and line of collimation
None of these
error due to horizontal axis not being perpendicular to the vertical axis
index error i.e. error due to imperfect adjustment of the vertical circle vernier

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Surveying
Dumpy level is most suitable when

the instrument is to be shifted frequently
All of these
fly levelling is being done over long distance
many readings are to be taken from a single setting of the instrument

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