Question:-
Assertion (A): Refining the grain size of polycrystalline material renders it harder and stronger
Reason(R): Grain boundaries provide easy paths to dislocation motion
Option (A)
Both A and R are individually true and R is the correct explanation of A
Option (B)
Both A and R are individually true but R is not the correct explanation A
Option(C)
A is true but R is false
Option(D)
A is false but R is true
Correct Option:
(C)
Question Solution:
Refining of grain size means having small grain which don’t permit movement of dislocation easily so strength increases
question-answer-faq-3286