Material science 1) Polypropylene (PP) has a glass-transition temperature of -15 oC       and a melting…

Material science
1) Polypropylene (PP) has a glass-transition temperature of -15
oC
      and a melting temperature of 175
oC. This means that at a
      temperature of -40 oC
that PP is ________, and at temperature
      0 oC PP is _________
.
      (A) brittle, brittle (B) ductile,
brittle (C) brittle, ductile
      (D) ductile, ductile (E) low in
thermal conductivity, high
       in thermal conductivity.
    
.2) Galvanized steel corrodes slowly in air because:
      (A) the Sn coating completely
covers the steel.
      (B) the Zn coating completely
covers the steel.
      (C) the Zn corrodes rather than
the steel.
      (D) the Sn corrodes rather than
the steel.
      (E)   the Fe has an
adherent oxide layer.  
                  
         
______________
3) Stopping the motion of which imperfection in metals results
in
      strengthening the metal (at low
temperature): (A) vacancies
       (B) grain boundaries (C)
inclusions (D) dislocations
       (E) interstitials?
                                                       
         
______________
4) Which process for a plain carbon steel (1080) results in
coarse
       pearlite:
      (A) anneal (B) austemper (C)
normalize
      (D) interrupted quench (E) quench
and temper.

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