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Solution


Q.

Pankaj’s father needs to purchase a new water tank for irrigating the fields. To find the right one, they visit a shop. The shopkeeper shows them three different types of water tanks, as shown below.

Based on the above information, answer the following questions:

 

(iii) (a) Find the ratio of the total surface area of type-I and type-II tanks, if the radius and height of type-I tank is 1.5 m and 3.5 m respectively.
1 471:1030  
2 470:1030  
3 471:1000  
4 461:1030  

Ans.

(1)

Radius of type-I tank, r = 1.5 m

Height of type-I tank, h' = 3.5 m

Required ratio:

 2πr(r+h')2(lb+bh+hl)=2×3.14×1.5(1.5+3.5)103

=47.1103=4711030i.e., 471:1030