Surveying
Local attraction in compass surveying may exist due to

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

ANSWER DOWNLOAD EXAMIANS APP

Surveying
The rise and fall method

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

ANSWER DOWNLOAD EXAMIANS APP