Surveying
In the double application of principle of reversion, the apparent error is

half the true error
equal to true error
four times the true error
two times the true error

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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 right 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

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Surveying
Pick up the incorrect statement from the following. In a spherical triangle

Every angle is less than two right angles
Sum of any two sides is greater than the third
Sum of the three angles less than six right angles and greater than two right angles
Sum of the three angles is equal to two right angles

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