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

3 cm
2 cm
4 cm
1 cm

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Surveying
Normal tension is that pull which

makes the correction due to pull equal to zero
neutralizes the effect due to pull and sag
makes the correction due to sag equal to zero
is used at the time of standardising the tape

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