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10th Class Mathematics Surface Areas and Volumes Question Bank Surface Areas and Volumes

  • question_answer
    A cuboidal metal of dimensions \[44\text{ }cm\times 30\text{ }cm\times 15\text{ }cm\]was melted and cast into a cylinder of height 28 cm. Its radius is  

    A)  20cm             

    B)  15cm             

    C)         10cm             

    D)  25cm 

    Correct Answer: B

    Solution :

    Volume of cuboid \[=44\times 30\times 15\text{ }c{{m}^{3}}\] This volume is equal to volume of cylinder \[\therefore \] \[44\times 30\times 15=\pi \times {{r}^{2}}\times 28\] \[\therefore \]\[r=15\,cm\]


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