<prompt> During active labour cervical dilatation per hour in primi is: .1.2 cms1.5 cms1.7 cms2 cms  <response>: Labour is said to active when:Cervix is dilated to at least 3 4 cm.Regular uterine contractions are present.Rate of dilatation is at least 1.2 cmhr for nulliparous and 1.5 cmhr for parous women. 