Rivets are made of following type of material_________________?
		A. tough
B. hard
C. resilient
D. ductile
E. malleable
		A. tough
B. hard
C. resilient
D. ductile
E. malleable
		A. angstrom
B. light year
C. micron
D. millimeter
E. milestone
		A. same
B. more
C. less
D. more or less depending on other factors
E. unpredictable
		A. kg m
B. kcal
C. wattr
D. watt hours
E. kg m x (m/sec)2
		A. frequent heat treatment
B. fatigue
C. creep
D. shock loading
E. resonant condition
		A. angle between normal reaction and the resultant of normal reaction and the limiting friction
B. ratio of limiting friction and normal reaction
C. the ratio of minimum friction force to the friction force acting when the body is just about to move
D. the ratio of minimum friction force to friction force acting when the body is in motion
E. ratio of static and dynamic friction
		A. one point
B. one plane
C. different planes
D. perpendicular planes
E. different points