threads for the nut at one end and head at the other end

head at one end and the other end fits into a tapped hole of one of the parts to be fastened

threads at both ends

pointed threads

mild steel

aluminium

brass

cast iron

equal to

double

three times

six times

minor diameter

major diameter

pitch diameter

none of these

1-3 m/s

3-15 m/s

15-30 m/s

30-50 m/s