one-half

two-third

three-fourth

double

14.5 Degree composite and full depth involute system

20 Degree full depth involute system

20 Degree stub system

none of the above

friction angle is less than helix angle

friction angle is more than helix angle

friction angle is equal to helix angle

efficiency of screw is 100%

brittle materials

ductile materials

plastic materials

non-ferrous materials

regain its original shape after deformation when the external forces are removed

draw into wires by the application of a tensile force

resist fracture due to high impact loads

retain deformation produced under load permanently