Each question consists of two statements, namely, Assertion (A) and Reason (R). For selecting the correct answer, use the following code:

Assertion (A): 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.

Reason (R): The total surface area of a hemisphere is 3πr².

Match the following columns:

Each question consists of two statements, namely, Assertion (A) and Reason (R). For selecting the correct answer, use the following code:

Assertion (A): If the radii of the circular ends of a bucket 24 cm high are 15 cm and 5 cm respectively, then the surface area of the bucket is 545 π cm².

Reason (R): If the radii of the circular ends of the frustum of a cone are R and r respectively and its height is h, then its surface area is π {R² + r² + l(R - r)},where l² = h² + (R –r)².

Each question consists of two statements, namely, Assertion (A) and Reason (R). For selecting the correct answer, use the following code:

Assertion (A): The number of coins 1.75 cm in diameter and 2 mm thick from a melted cuboid (10 cm × 5.5 cm × 3.5 cm) is 400.

Reason (R): Volume of a cylinder of base radius r and height h is given by V= (πr²h) cubic units. And, area of a cuboid = (l × b × h) cubic units.

Each question consists of two statements, namely, Assertion (A) and Reason (R). For selecting the correct answer, use the following code:

Assertion (A): If the volumes of two sphere are in the ratio 27:8 then their surface areas are in the ratio 3:2

Reason (R): Volume of a sphere .

Surface area of a sphere = 4πR².