16.67%(A) Both a and r are true but r is not the reason of a. ( 2 voters )
50%(B) Both a and r are true but r is the reason of a. ( 6 voters )
33.33%(C) a is true but r is false ( 4 voters )
0%(D) a is false but r is true
Based On 12 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.