Mensuration Mcqs

Q.  A metallic sphere of radius 12 cm is melted and drawn into a wire, whose radius of cross section is 16 cm. What is the length of the wire?

a. 45 cm
b. 18 cm
c. 90 cm
d. None of these


ANSWER: See Answer
 
Volume of the wire (in Cylindrical shape) is equal to the volume of the sphere.

π(16)2 * h = (4/3)π (12)3 => h = 9 cm
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