Question

Assertion- Refining the grain size of polychristalline Material does not make it harder and stronger. Reason- Grain boundaries provide easy paths for dislocation.
A- Both A&R are true and also R is the correct explaination for A
B- A is true and R is false
C- Both A& B are true but R is not correct explaination for A
D- Both A& R are false
E- None of these.
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Answer 1

Answer:

a

Explanation:

both a&r are trun and also R is the correct explanation for a