6) Which term is used to indicate the distance from a point on one thread to the corresponding point on the adjacent thread measured parallel to the axis?

7) What is the distance moved by a threaded component during one complete revolution?

8) Which of the following thread is used in ordinary bolts and nuts?

9) Find the lead of a double start thread having a pitch 1.5mm.

10) What is the included angle of the conical point of lathe centre?