Multiple Choice Questions on By melting two solid metallic spheres of radii 1 cm and 6 cm a hollow sphere of thickness 1 cm is ma........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

By melting two solid metallic spheres of radii 1 cm and 6 cm a hollow sphere of thickness 1 cm is ma...........

Quantitative Aptitude ( CCS) Mensuration 3D
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    By melting two solid metallic spheres of radii 1 cm and 6 cm, a hollow sphere of thickness 1 cm is made. The external radius of the hollow sphere will be.

    8 cm

    Incorrect Answer

    9 cm

    Correct Answer

    6 cm

    Incorrect Answer

    7 cm

    Incorrect Answer
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    Explanation:

    4/3* π (R3 + r3)= 4/3* π * ((x+1)3 – x3)
    R=6 cm; r=1 cm; x= radius of hollow sphere inner; (x+1)=outer radius
    solve and get x=8
    outer=x+1=9 cm

    By: Amit Kumar
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