Surveying
The rate of change of parallax dp/dh with respect to change in h, may be expressed as

fB/(H - h)
fB/(H + h)²
fB/(H + h)
fB/(H - h)²

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Surveying
Dumpy level is most suitable when

the instrument is to be shifted frequently
All of these
fly levelling is being done over long distance
many readings are to be taken from a single setting of the instrument

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Surveying
Transit rule of adjusting the consecutive coordinates of a traverse is used where

All of these
angular measurements are more accurate than linear measurements
linear measurements are more accurate than angular measurements
linear and angular measurements of the traverse are of equal accuracy

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Surveying
The cross hairs in the surveying telescope are placed

much closer to the eye-piece than to the objective lens
anywhere between eye-piece and objective lens
much closer to the objective lens than to the eye piece
midway between eye piece and objec-tive lens

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