A) 3.696 kg
B) 3.6 kg
C) 36 kg
D) 36.9 kg
Correct Answer: A
Solution :
\[\because \] \[h=2.1\,cm,\] \[{{r}_{1}}=4\,cm,\] \[{{r}_{2}}=3\,cm\] \[\therefore \] Volume of iron pipe \[=\pi ({{4}^{2}}-{{3}^{2}})\times 21\] \[=\frac{22}{7}(16-9)\times 21=462\,c{{m}^{3}}\] \[\because \] Weight of \[1\,c{{m}^{3}}=8\,g\] \[\therefore \] Weight of \[462\,c{{m}^{3}}=8\times 462\,g\] \[=3.696\,kg\]
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