Rank the strips bending at 100^o C

Bend the most                                                                   Bend the least

  Metal Q                     Metal P              Metal S                   Metal R

W = QP  with Q bending more —> correct

X =  PR with P bending more  —-> correct

Y =   SQ with S bending more  —-> incorrect

Z =   RS with R bending more —-> incorrect

Hence Y and Z are incorrectly drawn, answer (3)

Thank you sushi88 🙂

Honestly, this question is ridiculously convoluted and takes some time to comprehend.  Not sure if such questions should be featured in exams.  By the time you fully understand the question, the exam is over an hour ago 🙂

Yes chiefkiasu..so stressful for us students:( thanks anyway .