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Surveying

Surveying
A metallic tape is made of

cloth and wires
invar
steel
linen

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Surveying
If ‘f’ is the focal length of the camera lens and ‘θ’ is the angle of tilt, the distance of the plumb point from the principal point will be

f tan θ
f sec θ
f cos θ
f sin θ

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Surveying
In the cross-section method of indirect contouring, the spacing of cross-sections depends uponi) contour intervalii) scale of planiii) characteristics of groundThe correct answer is

(i) and (ii)
(i), (ii) and (iii)
(ii) and (iii)
only (i)

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Surveying
G.M.T. corresponding to given mean time, equals

L.M.T. - East longitude in time
L.M.T. + East longitude in time
L.M.T. - West longitude in time
None of these

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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 plumb point, is

f/H
f/H cos ½θ
f/H sec θ
f sec θ/H

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Surveying
If the staff is not held vertical at a level¬ling station, the reduced level calculated from the observation would be

true R.L.
None of these
less than true R.L.
more than true R.L.

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