Surveying
Equation of time which is the difference between apparent solar time and mean solar time at any instant, vanishes during one year

Twice
Four times
Once
Thrice

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Surveying
The rise and fall method

quicker and less tedious for large number of intermediate sights
provides a check on the reduction of intermediate point levels
is less accurate than height of instrument method
is not suitable for levelling with tilting levels

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Surveying
Which of the following errors cannot be eliminated by taking both face observations ?

error due to non-parallelism of the axis of telescope level and line of collimation
error due to horizontal axis not being perpendicular to the vertical axis
index error i.e. error due to imperfect adjustment of the vertical circle vernier
None of these

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Surveying
Spring tides are caused when

Solar tidal force acts opposite to lunar tidal force
Sun and moon are in line with earth
Solar tidal force and lunar tidal force both coincide
None of these

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