It is not possible to draw the perpendicular bisector of a line segment using a protractor ruler with no markings on it.
False
Take a line segment say AB. Make angles 60∘ on both the ends such that the lines along those angles intersect at C. Taking AB as the base side, draw 30∘ angle and a line along it such that it intersects AB at D. Point D bisects AB and ∠ADB is 90∘. So, AD is the perpendicular bisector of AB.