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Assertion (A) : When a hemisphere of same radius ($r$) is carved out from one side of a solid wooden cylinder, the total surface area of remaining solid is increased by $2\pi r^2$.
Reason (R) : Curved surface area of hemisphere is $2\pi r^2$.
Reason (R) : Curved surface area of hemisphere is $2\pi r^2$.
- (a)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
- (b)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
- (c)Assertion (A) is true, but Reason (R) is false.
- (d)Assertion (A) is false, but Reason (R) is true.
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Ans: (D) Assertion (A) is false, but Reason (R) is true.