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

None of these
error due to horizontal axis not being perpendicular to the vertical axis
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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Surveying
Circumpolar stars

Rotate round the celestial pole
Are seldom seen near the pole star
Rotate round the North Pole
Remain always above the horizon

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Surveying
Normal tension is that pull which

makes the correction due to sag equal to zero
neutralizes the effect due to pull and sag
is used at the time of standardising the tape
makes the correction due to pull equal to zero

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