For accurate work, the steel band should always be used in preference to chain because the steel band

a) is lighter than chain
b) is easier to handle
c) is practically inextensible and is not liable to kinks when in use
d) can be easily repaired in the field
Ans: c

  If altitude bubble is provided both on index frame as well as on telescope of a theodolite, then the instrument is levelled with reference to

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