Surveying
A star may culminate at zenith if its declination is

Less than the latitude of the place
None of these
Greater than the longitude of the place
Equal to the latitude of the place

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

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

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