1. 

A spherical ball of given radius x cm is melted and made into a right circular cylinder. What is the height of the cylinder?

I.  The volume of the cylinder is equal to the volume of the ball.

II. The area of the base of the cylinder is given.

A. I alone sufficient while II alone not sufficient to answer
B. II alone sufficient while I alone not sufficient to answer
C. Either I or II alone sufficient to answer
D. Both I and II are not sufficient to answer
E. Both I and II are necessary to answer

Answer: Option B

Explanation:

Clearly, I is not needed, since it is evident from the given question.

From II, we get radius of the base of the cylinder.

Now, x3 = r2h in which x and r are known.

h can be determined.

Correct answer is (B)