Question : What is the radius of a normal cylinder whose height is 21 cm and curved surface area is 1386 cm2?
Option 1: 10.5 cm
Option 2: 3.5 cm
Option 3: 7 cm
Option 4: 10 cm
Answer (1)
22nd Jan, 2024
Correct Answer: 10.5 cm
Solution :
Given: Height($h$) = 21 cm
Let the radius be $r$.
Curved surface area = 1386 cm
2
⇒ $1386=2\pi r h$
⇒ $1386=2\times\frac{22}{7}\times21\times r $
⇒ $r=\frac{1386\times 7}{2\times 22\times21}$
⇒ $r = 10.5~\text{cm}$
Hence, the correct answer is 10.5 cm.
Comments (0)
Related Questions
Know More about
Staff Selection Commission Sub Inspector ...
Result | Eligibility | Application | Selection Process | Cutoff | Admit Card | Preparation Tips
Get Updates Brochure
Thank You!
Your Staff Selection Commission Sub Inspector Exam brochure has been successfully mailed to your registered email id “”.
Upcoming Exams
Application Date:
27 Dec, 2024
- 16 Jan, 2025
Admit Card Date:
26 Dec, 2024
- 20 Jan, 2025
Application Date:
1 Dec, 2024
- 30 Dec, 2024
Admit Card Date:
23 Dec, 2024
- 5 Jan, 2025
Application Date:
17 Dec, 2024
- 1 Jan, 2025
