<prompt> During active labour cervical dilatation per hour in primi is:1.2 cm1.5 cm1.7 cm2 cm  <response>: Ans. is a, i.e. 1.2 cmLabour is said to active when:Cervix is dilated to at least 6cm.QRegular uterine contractions are present.QRate of dilatation is at least 1.2cmhrQ for nulliparous and 1.5cmhrQ for parous women. 