Question : Two cubes each of edge 9 cm are joined to form a single cuboid. What is the total surface area of the cuboid formed?
Option 1: 775 cm2
Option 2: 810 cm2
Option 3: 990 cm2
Option 4: 1024 cm2
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Correct Answer: 810 cm2
Solution : After joining two cubes, a cuboid is formed. Then, the length of the cuboid, $l$ = 18 cm Breadth of cuboid, $b$ = 9 cm Height of cuboid, $h$ = 9 cm Total surface area = $2(lb + bh + hl)$ = 2(18 × 9 + 9 × 9 + 9 × 18) = 810 cm2 Hence, the correct answer is 810 cm2.
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Question : Two cubes each of edge 14 cm are joined to form a single cuboid. What is the volume of the cuboid formed?
Option 1: 5022 cm3
Option 2: 5244 cm3
Option 3: 5666 cm3
Option 4: 5488 cm3
Question : 2 cubes each of volumes 125 cm3 are joined end to end. The surface area of the resulting cuboid is:
Option 1: 325 cm2
Option 2: 350 cm2
Option 3: 125 cm2
Option 4: 250 cm2
Question : The length of a cuboid is half of its breadth and the height of the cuboid is thrice of its breadth. If the breadth of the cuboid is 12 cm, then what is the total surface area of the cuboid?
Option 1: 1680 cm2
Option 2: 1320 cm2
Option 3: 1440 cm2
Option 4: 1560 cm2
Question : The length of a cuboid is six times its breadth and the height of a cuboid is four times its breadth. If the breadth of the cuboid is 3 cm, then what is the total surface area of the cuboid?
Option 1: 484 cm2
Option 2: 612 cm2
Option 3: 576 cm2
Option 4: 676 cm2
Question : The length of a cuboid is 10 cm. If the breadth of the cuboid is half of its length and the height of the cuboid is twice its length, then what is the lateral surface area of the cuboid?
Option 1: 600 cm2
Option 2: 500 cm2
Option 3: 720 cm2
Option 4: 560 cm2
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