Question
Outer diameter of 20 cm long pipe is 25 cm. If the
thickness of the metal in the pipe is 1 cm. Find the total surface area of the pipe?Solution
Outer part surface area = 2(22/7)Rh Inner part surface area = 2(22/7)rh Area of shaded portion = 2 (22/7) R² - ((22/7) r)² = (22/7) (R² - r²) Total surface area = 2(22/7)Rh + 2(22/7)rh + 2(22/7) (R² - r²) = 2 (22/7) (R+r) [h + R - r] = 2 (22/7) (R+r) [h + thickness] Required surface area = 2 × 22/7 (R+r) [h + thickness] = 2 × 22/7 × (12.5 + 11.5) × 21 = 132 × 24 = 3168
 Select the most appropriate option to fill in blank
Find the appropriate word for Blank 4.
Find the appropriate word.
Find the appropriate word.
1. We must recognize that politics
P. about the careers and fortunes
Q. citizens and not
R. and elections are about
S. the l...
Fill the blank 5.
Choose the most appropriate word to fill the blank (g)
Her gratuity and provident fund were settled in 2005. Since , her request for pension was not considered.
Fill the blank 2.
Select the most appropriate option for blank No. 85
