Question : The largest possible right circular cylinder is cut out from a wooden cube of edge 7 cm. Find the volume of the cube (in cm3) left over after cutting the cylinder. (Use $\pi=\frac{22}{7}$)
Option 1: 73.5
Option 2: 63.5
Option 3: 87.5
Option 4: 67.5
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Correct Answer: 73.5
Solution : The largest possible right circular cylinder that can be cut out from a cube will have its diameter equal to the edge of the cube. Given that the edge of the cube is 7 cm, the radius $r$ of the cylinder is $\frac{7}{2}$ cm and the height $h$ of the cylinder is also 7 cm. The volume of the cylinder, $V_1=\pi r^2 h = \pi \left(\frac{7}{2}\right)^2 \times 7 = \frac{22}{7} \times \frac{49}{4} \times 7 =269.5\;\text{cm}^3$ The volume of the cube is $s^3$, where $s$ is the edge of the cube. $V_2 = 7^3=343\;\text{cm}^3$ The volume of the cube left over after cutting the cylinder = $V_2 - V_1$ = 343 – 269.5 = 73.5 cm3 Hence, the correct answer is 73.5.
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Question : The Largest possible sphere is carved out of a cube of side 6 cm. What is the volume of the sphere?
Option 1: $\frac{792}{7}$ cm3
Option 2: $\frac{144}{7}$ cm3
Option 3: $\frac{133}{3}$ cm3
Option 4: $\frac{144}{3}$ cm3
Question : The curved surface area of a cylinder, whose height is 10 cm, is 1320 cm2. What is the volume of this cylinder? [Use $\pi$ $\left.=\frac{22}{7}\right]$
Option 1: 1388 m3
Option 2: 0.001368 m3
Option 3: 0.1386 m3
Option 4: 0.01386 m3
Question : What is the height of a cylinder whose radius of base is 12 cm and volume is 19008 cm3? [Use $\pi=\frac{22}{7}$]
Option 1: 6 cm
Option 2: 24 cm
Option 3: 38 cm
Option 4: 42 cm
Question : The outer radius of a spherical shell is 13 cm and the thickness of the shell is 3 cm. What is the volume of the metal used for the shell? $\left(\pi=\frac{22}{7}\right)$
Option 1: 1197 cm3
Option 2: 2197 cm3
Option 3: 3024 cm3
Option 4: 5016 cm3
Question : The radius of a right circular cylinder is thrice of its height. If the height of the cylinder is 3.5 cm, what is the volume of the cylinder?
Option 1: 1124.25 cm3
Option 2: 1324.75 cm3
Option 3: 1468.25 cm3
Option 4: 1212.75 cm3
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