Q: 19 (NDA-II/2013)

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Suppose we have an iron nail and an iron ball of same mass. When submerged in water, the iron ball may float but the nail always sinks. This is because
question_subject: 
Science
question_year: 
2013
question_exam: 
NDA-II
stats: 
0,376,56,376,32,8,16