Surveying
Local attraction in compass surveying may exist due to

loss of magnetism of the needle
friction of the needle at the pivot
presence of magnetic substances near the instrument
incorrect levelling of the magnetic needle

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Surveying
Pick up the correct statement for horizontal photographs.

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

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Surveying
Pick up the incorrect statement from the following. In a spherical triangle

Sum of the three angles less than six right angles and greater than two right angles
Sum of any two sides is greater than the third
Every angle is less than two right angles
Sum of the three angles is equal to two right angles

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