12.5%(A) Both a and r are true but r is not the reason of a. ( 1 voter )
50%(B) Both a and r are true but r is the reason of a. ( 4 voters )
37.5%(C) a is true but r is false ( 3 voters )
0%(D) a is false but r is true
Based On 8 Votes
GATE MT 2011 Q45. Assertion ‘a’ : during casting of element grain refinement can be achieved by addition of certain allowing elements Reason ‘r’ : the addition of alloying element may result in the formation of deoxidation product or inter metallic compounds which may act as nucleation sites for grain refinement.