Practicing Success

Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Mensuration: 3D

Question:

Total surface area of aright circular cylinder is 1848 cm2. The ratio of its total surface area to the curved surface area is 3 : 1. The volume of the cylinder is:(Take $\pi = \frac{22}{7}$)

Options:

4002 cm2

3696 cm2

4312 cm2

4851 cm2

Correct Answer:

4312 cm2

Explanation:

We know that,

Total surface area of cylinder = 2πr(r + h)

Curved surface area of cylinder = 2πrh

and Volume of cylinder = πr2h

We have, 2πr(r + h) = 1848

\(\frac{ 2πr(r + h)}{ 2πrh }\) = \(\frac{3}{1}\)

= r + h = 3h

= 2h = r

= h = \(\frac{r}{2}\)

Put it in the total surface area formula,

= 2 × \(\frac{22}{7}\) × r × (r + \(\frac{r}{2}\)) = 1848

= 2 × \(\frac{22}{7}\) × r × \(\frac{3r}{2}\) = 1848

= r2 = 7 × 7 × 4

= r = 14

= h = \(\frac{14}{2}\) = 7 cm

= Volume of cylinder = \(\frac{22}{7}\) × 14 × 14 × 7 = 4312 cm3