Surveying
An aerial photograph may be assumed as

Central projection
Parallel projection
Orthogonal projection
None of these

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

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

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Surveying
Sidereal day

Is divided into the conventional hours, minutes and seconds
Is the period of time taken by the earth in making a complete rotation with reference to stars
Is slightly shorter than an ordinary solar day
All listed here

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