railway RRB JE (CBT I + CBT II) Mock Test 2024 Surveying Levelling

Which of the following is an INCORRECT statement related to the height of the instrument (HI) used in levelling?

1
The value of HI never changes after recording back sights.
2
The value of HI never changes while recording intermediate sights.
3
The value of HI never changes while recording fore sights.
4
The value of HI generally changes before recording back sights.
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