Surveying
Dumpy level is most suitable when

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

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Surveying
The length of a chain is measured from

centre of one handle to centre of other handle
inside of one handle to inside of other handle
outside of one handle to outside of other handle
outside of one handle to inside of other handle

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