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
Celestial horizon
All of these

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Surveying
A telescope is said to be inverted if its

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

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Surveying
Normal tension is that pull which

makes the correction due to sag equal to zero
is used at the time of standardising the tape
neutralizes the effect due to pull and sag
makes the correction due to pull equal to zero

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