Surveying
If 16 flight lines are run perpendicular to an area 30 km wide, their spacings on a photographical map on scale 1 : 50,000 , will be

2 cm
1 cm
3 cm
4 cm

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

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Surveying
Theodolite is an instrument used for

measurement of vertical angles only
tightening the capstan-headed nuts of level tube
measurement of both horizontal and vertical angles
measurement of horizontal angles only

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