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

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Surveying
Pick up the correct statement from the following. The difference between the longitudes of the places is obtained.

All of these
By subtracting the sum of their longitudes exceeding 180° from 360° if places are in different hemispheres
By subtracting their longitudes if places are in the same hemisphere
By adding their longitudes if places are in the different hemispheres

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Surveying
Dumpy level is most suitable when

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

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