The curved surface area of a cylindrical pillar is 264 m² and its volume is 924 m³. Find the ratio of its diameter to its height.
- (a) 3:7
- (b) 7:3
- (c) 6:7
- (d) 7:6
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A cistern of capacity 8000 litres measures externally 3.3 m by 2.6 m by 1.1 m and its walls are 5 cm thick. The thickness of the bottom is:
- (a) 90 cm
- (b) 1 dm
- (c) 1 m
- (d) 1.1 cm
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What is the total surface area of a right circular cone of height 14 cm and base radius 7 cm?
- (a) 344.35 cm²
- (b) 462 cm²
- (c) 498.35 cm²
- (d) None of these
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A large cube is formed from the material obtained by melting three smaller cubes of 3 cm, 4 cm, and 5 cm side. What is the ratio of the total surface areas of the smaller cubes to the large cube?
- (a) 2:1
- (b) 3:2
- (c) 25:18
- (d) 27:20
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How many bricks, each measuring 25 cm x 11.25 cm x 6 cm, will be needed to build a wall of 8 m x 6 m x 22.5 cm?
- (a) 5600
- (b) 6000
- (c) 6400
- (d) 7200
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