Surveying
The nautical mile is the length of

1 minute of latitude
1 degree of longitude
1 degree of latitude
1 minute of longitude

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Surveying
Which of the following errors can be eliminated by taking mean of bot face observations ?

error due to imperfect adjustment of plate levels
error due to eccentricity of verniers
error due to imperfect graduations
error due to line of collimation not being perpendicular to horizontal axis

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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

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

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Surveying
Dumpy level is most suitable when

All of these
the instrument is to be shifted frequently
fly levelling is being done over long distance
many readings are to be taken from a single setting of the instrument

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