Surveying
If the focal length of the object glass is 25 cm and the distance from object glass to the trunnion axis is 15 cm, the additive constant is

0.6
0.4
1.33
0.1

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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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