Surveying
In the double application of principle of reversion, the apparent error is

equal to true error
two times the true error
four times the true error
half the true error

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Surveying
Spring tides are caused when

Sun and moon are in line with earth
None of these
Solar tidal force acts opposite to lunar tidal force
Solar tidal force and lunar tidal force both coincide

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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 level The correct answer is

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

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