Volume and surface area - Quantitative Aptitude (MCQ) questions for Q. 123

Q.  Volume of a sphere with radius r is obtained by multiplying its surface area by r and a constant. Find the value of constant:
- Published on 15 Jun 15

a. 3
b. 1/3
c. 4/3
d. 1

ANSWER: 1/3
 
Volume of a sphere: (4/3)* π*r3

Area of a sphere: 4πr2

=>It is mentioned that surface area when multiplied by r and a constant gives Volume and value of constant is to be found.

=> 4πr2*r*k= (4/3)* π*r3

=>k=1/3

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