10th Class Mathematics Solved Paper - Mathematics-2016 Outside Delhi Set-I

  • question_answer 18) A sphere of diameter 12 cm, is dropped in a right circular cylindrical vessel, partly filled with water. If the sphere is completely submerged in water, the water level in the cylindrical vessel rises by  \[\frac{32}{9}cm\]. Find the diameter of the cylindrical vessel.  

    Answer:

    Given, diameter of sphere \[=12\text{ }cm\]
    then, radius of sphere \[(r)=\frac{12}{2}=6\,cm\]
    Volume of sphere \[=\frac{4}{3}\pi {{r}^{3}}\]
    \[=\frac{4}{3}\times \pi \times {{(6)}^{3}}c{{m}^{3}}\]
    Now, sphere is completely submerged in water and rise in water in cylindrical vessel is \[3\frac{5}{9}cm.\]
    Volume of sphere = Volume of cylindrical vessel.
                \[\frac{4}{3}\pi \times {{(6)}^{3}}=\pi {{r}^{2}}\times \frac{32}{9}\]
                            \[{{r}^{2}}=\frac{4\times 6\times 6\times 6\times 9}{3\times 32}\]
                            \[r=\sqrt{81}\]
                            \[r=9\,\,cm\]
    \[\therefore \] Diameter of the cylindrical vessel is \[18\text{ }cm\].


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