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      Question

      What is the volume (in cm3) of the metal used

      to make a spherical shell whose inner and outer radii are respectively 5 cm and 8 cm?
      A 524╧А Correct Answer Incorrect Answer
      B 576╧А Correct Answer Incorrect Answer
      C 516╧А Correct Answer Incorrect Answer
      D 476╧А Correct Answer Incorrect Answer

      Solution

      Volume of metal used to make a spherical shell = (4/3) X ╧А X (R3┬а- r3) {Where 'R' and 'r' is the outer and inner radius of the spherical shell, respectively} = (4/3) X ╧А X (83┬а- 53) = (4/3) X ╧А X (512 - 125) = (4/3) X ╧А X 387 = 516╧А cm3

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