1 .	The radi us of cross-se ct ion of a sol id cyl indric al rod of iron is 50 cm. The cylinder is melted down and formed in to six solid spherical balls of the same radius as that of the cylinder. The length of the rod (in meters) will be –
[ A ]    0.8 [ B ]    2 [ C ]    3 [ D ]    4
Answer : Option D Explanation :
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