Q4Multiple choiceExercise 13.1
3 8 πr 3 32 3
- (A)πr
- (B)4πr 3
- (C)
- (D)πr 3 3 3 2. The total surface area of a cube is 96 cm2. The volume of the cube is: (A) 8 cm3 (B) 512 cm3 (C) 64 cm3 (D) 27 cm3 3. A cone is 8.4 cm high and the radius of its base is 2.1 cm. It is melted and recast into a sphere. The radius of the sphere is : (A) 4.2 cm (B) 2.1 cm (C) 2.4 cm (D) 1.6 cm 4. In a cylinder, radius is doubled and height is halved, curved surface area will be SURFACE AREAS AND VOLUMES 123 (A) halved (B) doubled (C) same (D) four times
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(C)