SATHEE: Quantitative Aptitude Ques 975

Quantitative Aptitude Ques 975

Question: The height of a circular cylinder is increased six times and the base area is decreased to one-ninth of its value. The factor by which the lateral surface area of the cylinder increases, is

Options:

A) $ 2 $

B) $ \frac{1}{2} $

C) $ \frac{2}{5} $

D) $ \frac{3}{2} $

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Answer:

Correct Answer: A

Solution:

Curved surface area of cylinder $ =2\pi rh $ New height = 6h Now, base area is decreased by 9 times.

$ \therefore $ Radius will be decreased by 3 times. New radius $ =\frac{1}{3}r $ Curved surface area $ =2\pi \frac{1}{3}r\times 6h=(2\pi rh)\times 2 $ Hence, lateral surface area is increased by 2 times.

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Quantitative Aptitude Ques 975

Question: The height of a circular cylinder is increased six times and the base area is decreased to one-ninth of its value. The factor by which the lateral surface area of the cylinder increases, is

Options:

Answer:

Solution:

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