13 - In general, increasing the ( depth / rate ) of deformation has the same influence on the stress-strain characteristics of polymers as decreasing the ( modulus / temperature ); that is, the material behaves harder and more brittle.2Q14 - ( Viscoelastic / plastic ) mechanical behavior is intermediate between totally elastic and totally viscous.2Q15 - Generally, the mode of fracture in thermosetting polymers is ( brittle / pseudoelastic ).2Q16 - Izod or Charpy tests are used to assess ( fatigue / impact ) strength.2Q17 - Appreciable tensile deformation of semicrystalline polymers produces a highly oriented structure; this process of orientation is referred to as ( extruding / drawing / aligning ).2Q18 - The magnitude of the tensile modulus does not seem to be directly influenced by molecular weight. However, the tensile strength often increases with ( increasing / hardening ) molecular weight.2Q19 - Increasing crystallinity significantly ( lowers / increases ) the tensile modulus of polymers.2Q20 - The crosslinking process in elastomers is called ( hardening / aligning / vulcanization ).2