Sep 17, 2020 · Surface Area And Volume Class 10 MCQ Question 4. The total surface area of a hemispherical solid having radius 7 cm is (a) 462 cm² (b) 294 cm² (c) 588 cm² (d) 154 cm². Answer/ Explanation. Answer: a Explaination: Reason: Total surface area of hemisphere = 3πr² = 3 × \(\frac{22}{7}\) × 7 × 7 = 462 cm²