Surveying
The plane at right angle to the zenith-nadir line and passing through the centre of the earth, is called

True horizon
Rational horizon
All of these
Celestial horizon

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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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Surveying
A telescope is said to be inverted if its

vertical circle is to its left and the bubble of the telescope is up
vertical circle is to its left and the bubble of the telescope is down
vertical circle is to its right and the bubble of the telescope is down
vertical circle is to its right and the bubble of the telescope is up

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