Question

Mohan lives in Hyderabad in Telengana. Those were very hot days of May. He thought that if we human beings need so much water to drink, wont the birds also be thirsty. He decided to prepare a vessel to provide water for birds. He found a flexible blue coloured plastic rectangular sheet 44cm x 15cm. He rolled it along its length and joined the opposite ends using a tape. He wanted to have a circular base for this cylinder and searched for another cylinder. He found a square sheet 15cm x 15cm. He cut a circular sheet just equal to the base of the cylinder from it. Now answer the following questions:

a) The curved surface area of the cylinder formed is
i. 540 cm2
ii. 560 cm2
iii. 640 cm2
iv. 660 cm2

b) The radius of the base of the cylinder is:
i. 2 cm
ii. 3.5 cm
iii. 7 cm
iv. 10 cm

c) The area of the circular base required for cylinder is
i. 154 cm
ii. 216 cm
iii. 260 cm
iv. 308 cm

d) find the volume of the water that can be filled in the cylinder
i.1410 ml
ii. 1730 ml
iii. 2170 ml
iv. 2310 ml​

Answer 1

Answer:

Curved surface area of cylinder with radius r and height h is =2πrh

⇒2πrh=660

⇒h=

2×22×5

660×7

= 21 cm