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

can be easily repaired in the field
is practically inextensible and is not liable to kinks when in use
is lighter than chain
is easier to handle

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Surveying
Which of the following errors cannot be eliminated by taking both face observations ?

error due to horizontal axis not being perpendicular to the vertical axis
None of these
error due to non-parallelism of the axis of telescope level and line of collimation
index error i.e. error due to imperfect adjustment of the vertical circle vernier

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