Surveying
Pick up the correct statement for horizontal photographs.

All listed here
The lines parallel to the negative plane are projected as parallel lines
Parallel lines do not appear parallel in central projection
The two sides of a road meet at the vanishing point

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Surveying
The rise and fall method

quicker and less tedious for large number of intermediate sights
is not suitable for levelling with tilting levels
provides a check on the reduction of intermediate point levels
is less accurate than height of instrument method

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Surveying
Systematic errors

All listed here
Are also known as cumulative errors
Always follow some definite mathematical law
Can be removed by applying corrections to the observed values

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