Surveying
Local attraction in compass surveying may exist due to

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

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Surveying
If altitude bubble is provided both on index frame as well as on telescope of a theodolite, then the instrument is levelled with reference toi) altitude bubble on index frameii) altitude bubble on index frame if it is to be used as a leveliii) altitude bubble on telescopeiv) altitude bubble on telescope if it is to be used as a level The correct answer is

both (ii) and (iii)
only (i)
both (i) and (iv)
only (iii)

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Surveying
Which of the following methods of theodolite traversing is suitable for locating the details which are far away from transit stations?

Measuring angle at one station and distance from other
Measuring angle and distance from one transit station
Measuring distance from two points on traverse line
Measuring angles to the point from at least two stations

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Surveying
Pick up the correct statement for horizontal photographs.

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

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