Question

Assertion (A)	Reason (R)
A hemisphere of radius 7 cm is to be painted outside on the surface. The total cost of painting at Rs 5 per cm2 is Rs 2300.	The total surface area of a hemisphere is 3πr2.

पर्याय

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

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

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

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

Answer 1

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

Explanation:

Assertion (A):

Total surface area of the hemisphere = 3πr³ 

`= (3xx22/7xx7xx7) "cm"^2`

= 462 cm²

Cost of painting at Rs 5 per cm² = Rs (462 × 5)

= Rs 2310

Hence, Assertion (A) is false.

Reason (R): The given statement is true.