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The correct answer a/b/c/d

A

Both Assertion (A) and Reason (R ) are true and Reason ( R) is a correct explanation of Assertion (A).

B

Both Assertion (A) and Reason (R ) are true but Reason (R ) is not a correct explanation of Assertion (A).

C

Assertion (A) is true and Reason (R ) is false.

D

Assertion (A) is false and Reason (R ) is true.

Text Solution

Verified by Experts

The correct Answer is:
C
We know that the volume of a cone is `1/3 pi r^2h`
SO , the given result ie Reason ( R) is false
Now r=3 cm and h=4 cm
`therefore` curved surface area of the cone
`=pirxxsqrt(r^2+h^2)=pixx3xxsqrt(3^2+4^2)`
`=3pi sqrt(25) cm^2 =(15 pi) cm^2 ` which is true
Thus, Assertion (A) is ture and Reason ( R) is false
Hence , the correct answer is ( c)
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