CGL 21 Tier 2 Maths


Question 1

The height of a cylinder is 45 cm. If the circumference of its base is 132 cm, then what is the curved surface of this cylinder? (use π = 22/7)

एक बेलन की ऊँचाई 45 cm है। यदि इसके आधार की परिधि 132 cm हो, तो इस बेलन का वक्र पृष्ठीय क्षेत्रफल कितना है? (π =2 2/7 लीजिए)


Options

A

5940 cm2

5940 cm2

B

6270 cm2

6270 cm2

C

5720 cm2

5720 cm2

D

6360 cm2

6360 cm2


Solution:

Correct Answer:

A

5940 cm2

5940 cm2


The height of a cylinder = h = 45 cm

circumference of cylinder's base = 2 π r = 132 cm 

curved surface of the cylinder = 2 π r h = 132 ×\times 45 = 5940 cm2

बेलन की ऊँचाई = h = 45 cm

बेलन के आधार की परिधि = 2 π r = 132 cm 

बेलन का वक्र पृष्ठीय क्षेत्रफल = 2 π r h = 132 ×\times 45 = 5940 cm2

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