The volume of a spherical balloon is increasing at the rate of 40 cubi – McqOptions

MCQOPTIONS

1.	The volume of a spherical balloon is increasing at the rate of 40 cubic centrimetre per minute. The rate of change of the surface of the balloon at the instant when its radius is 8 centimetre, is [Roorkee 1983]
A.	\[\frac{5}{2}\] sq cm/min
B.	5 sq cm/min
C.	10 sq cm/min
D.	20 sq cm/min
Answer» D. 20 sq cm/min

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