Question : If the curved surface area of a cylinder is 440 cm2 and the height of the cylinder is 10 cm, then what is the radius (in cm.) of the cylinder?
Option 1: 7
Option 2: 14
Option 3: 21
Option 4: 3.5
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Correct Answer: 7
Solution : The curved surface area of a cylinder of radius $r$ and height $h$ = $2\pi rh$. Height of the cylinder = 10 cm (given) ∴ $2\pi rh = 440$ ⇒ $2 \times \frac{22}{7} \times r \times 10 = 440$ ⇒ $r = 7$ cm Hence, the correct answer is 7.
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Question : The radius of a cylinder is 14 cm. If the height of the cylinder is four times of its radius, then what is the curved surface area of the cylinder?
Option 1: 5546 cm2
Option 2: 4928 cm2
Option 3: 4694 cm2
Option 4: 5214 cm2
Question : The radius of a right circular cylinder is 7 cm. Its height is thrice its radius. What is the curved surface area of the cylinder?
Option 1: 724 cm2
Option 2: 666 cm2
Option 3: 924 cm2
Option 4: 264 cm2
Question : The height and curved surface area of the cylinder are 15cm and 330 cm2. Find the diameter of the cylinder.
Option 1: 2 cm
Option 2: 5 cm
Option 3: 7 cm
Option 4: 6 cm
Question : What will be the curved surface area of a cylinder having a radius of 20 cm and a height of 34 cm?(use $\pi$ = 3.14)
Option 1: 3245.7 cm2
Option 2: 4328.98 cm2
Option 3: 4270.4 cm2
Option 4: 4320.6 cm2
Question : What will the curved surface area of a cylinder with a radius of 10 cm and height of 20 cm? (use $\pi=3.14$)
Option 1: 1345 cm2
Option 2: 1453 cm2
Option 3: 1256 cm2
Option 4: 1234 cm2
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