A) 2 cm
B) 3 cm
C) 1 cm
D) 3.5 cm
Correct Answer: C
Solution :
(c): Let the internal radius of the cylinder = r Then the volume of sphere = volume of hollow cylinder \[\Rightarrow \] \[\frac{4\pi {{.6}^{3}}}{3}=\pi h({{5}^{2}}-{{r}^{2}})\] \[\Rightarrow \] \[\frac{864\pi }{3}=32\pi (25-{{r}^{2}})\] \[\Rightarrow \] \[{{r}^{2}}=16=r=4\,cm\] So thickness of the cylinder = 5 ? 4 = 1 cm
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