A cylindrical tube open at both ends is made of metal. The internal diameter of the tube is 11.2 cm and its length is 21 cm. The metal everywhere is 0.4 cm thick. The volume of the metal is :
A. 280.52 cm3
B. 306.24 cm3
C. 310 cm3
D. 316 cm3
Answer: Option B
Solution(By Examveda Team)
Internal radius :$$\eqalign{ & = \left( {\frac{{11.2}}{2}} \right)cm \cr & = 5.6\,cm \cr} $$
External radius :
$$\eqalign{ & = \left( {5.6 + 0.4} \right)cm \cr & = 6\,cm \cr} $$
Volume of metal :
$$\eqalign{ & = \left[ {\frac{{22}}{7} \times \left\{ {{{\left( 6 \right)}^2} - {{\left( {5.6} \right)}^2}} \right\} \times 21} \right]c{m^3} \cr & = \left( {66 \times 11.6 \times 0.4} \right)c{m^3} \cr & = 306.24\,c{m^3} \cr} $$
Related Questions on Volume and Surface Area
A. 12$$\pi$$ cm3
B. 15$$\pi$$ cm3
C. 16$$\pi$$ cm3
D. 20$$\pi$$ cm3
In a shower, 5 cm of rain falls. The volume of water that falls on 1.5 hectares of ground is:
A. 75 cu. m
B. 750 cu. m
C. 7500 cu. m
D. 75000 cu. m
A. 84 meters
B. 90 meters
C. 168 meters
D. 336 meters
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