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Surveying

Surveying
In a spherical triangle ABC, right angled at C, sin b equals

sin a cos A
cot A tan a
cos a sin A
tan a cot A

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Surveying
According to Napier's Rules of circular parts for a right angled triangle, sine of middle part equals the product of

Cosines of two adjacent parts
Sines of two adjacent parts
Tangents of two adjacent parts
Both (A) and (B) above

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Surveying
The scale of a tilted photograph of focal length f taken from an altitude H, along the plate parallel through principal point is

f/H
f/H cos ½θ
f/H sec θ
f sec θ/H

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Surveying
The allowable length of an offset depends upon the

degree of accuracy required
All of these
scale of plotting
method of setting out the perpendiculars and nature of ground

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Surveying
The suitable contour interval for a map with scale 1 : 10000 is

5 m
10 m
2 m
20 m

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Surveying
A Nautical mile is

1855.109 m
One minute arc of the great circle passing through two points
One minute arc of the longitude
All of these

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