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SSC Sample Paper SSC-CGL TIER - I Sample Test Paper-2

  • question_answer
    An iron sphere of radius 27 cm is melted to form a wire of length 729 cm. The radius of wire is:

    A)  6 cm               

    B)  9 cm

    C)  18 cm 

    D)  36 cm

    Correct Answer: A

    Solution :

     Volume of sphere = Volume of wire \[\frac{4}{3}\pi \times {{27}^{3}}=\pi \times {{r}^{2}}\times 729\] \[r=\sqrt{\frac{4\times 27\times 27\times 27}{3\times 729}}=\sqrt{36}=\] \[\therefore \] Radius of the wire = 6 cm


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