Surveying
The nearest star is so far away from the earth that the directions to it from two diametrically opposite points on the earth differs less than

None of these
0.01 second
0.001 second
0.0001 second

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Surveying
If altitude bubble is provided both on index frame as well as on telescope of a theodolite, then the instrument is levelled with reference toi) altitude bubble on index frameii) altitude bubble on index frame if it is to be used as a leveliii) altitude bubble on telescopeiv) altitude bubble on telescope if it is to be used as a levelThe correct answer is

only (i)
both (i) and (iv)
both (ii) and (iii)
only (iii)

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