Question
Find the cost of painting all surfaces of a 10 m long
hollow steel pipe whose internal and external diameters measure 15 cm and 17 cm respectively, if the cost of painting 1 cm² of the surface is ₹0.15. [Use π = 22/7]Solution
External diameter = 17 cm Internal diameter = 15 cm Cost of painting = Rs 0.15 per cm² Height of cylinder = 10 m = 1000 cm External Radius(R) = 17/ 2 = 8.5 cm Internal Radius(r) = 15/ 2 = 7.5 cm Total Surface Area of a hollow cylinder = 2πh (R + r) + 2π (R² - r²) Total Surface area = 2π × 1000 × (8.5 + 7.5) + 2π [ (8.5) ² - (7.5) ²] 2π [1000×16+16] 2π×16[1000+1) 2×22/7×1001 = 100672 cm² Total cost of painting the cylinder = 100672 x 0.15 Rs 15100.80
Select the odd letters from the given alternatives?
Find the odd number from the given alternatives.
Three of the four words are alike in a certain way and one is different. Pick the odd one out.
Four words have been given, out of which three are alike in some manner and one is different. Select the odd word.
Select the option in which the letter clusters are related in the same way as the given set. Four letter clusters have been given, out of which three ar...
Three of the following four sequences of letters are alike in a certain way and one is different. Pick the odd one out.
Four letter clusters have been given out of which three are alike in some manner and one is different. Select the letter cluster that is different.
Select the odd letters from the given alternatives?
In the following question, four number pairs are given. In each pair the number on left side of (-) is related to the number of the right side of (-) wi...
Select the option in which the numbers do not share the same relationship as that shared by the given pair of numbers.
34 : 408
Relevant for Exams:
