Surveying
The sun's declination remains north between

Both (A) and (B) of above
September 21 to December 21
March 21 to June 21
June 21 to September 21

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

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

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