Question
The difference between the external and internal curved
surface areas of a 7 cm long cylindrical metallic pipe is 110 cm². If the pipe is made of 302.5 cm³ metal, then find the inner radius of the pipe. (Use π = 22/7)Solution
Let the outer and inner radius of the pipe be R and r centimeter respectively. According to the question, 2πR × 7 - 2πr × 7 = 110 2x22/7x 7 x (R- r) =110 44(R-r) = 110 (R-r) =110/44 (R-r) = 2.5 .... (1) According to the question, π (R2 – r2) x 7 = 302.5 = 22/7 × 7 × (R2-r2) = 302.5 (R2-r2)) =302.5/22 (R2-r²) =13.75 (R+r) (R-r) = 13.75 (R+r) x 2.5 = 13.75 (From 1) (R+r) = 13.75/2.5 (R+ r) = 5.5 .... (2) Solving (1) and (2), R = 4 and r = 1.5 The inner radius of the pipe is 1.5 cm.
The study carried on in collaboration with the Wildlife Institute of India and WWF India.
Given below is a sentence with or without an error. The error, if any, is in one part of the sentence. Choose the correct part which contains ...
In each of the questions, a sentence is divided into five parts A, B, C, D and E in which two of the parts have some grammatical errors in them. You ha...
The concept of ugly 1)/ and beautiful 2)/ are interchangeable 3) /and relative 4) /5)
Less of 10 per cent of (1)/ global climate finance and (2)/ only 1.2 per cent of humanitarian (3) /funding reaches local actors in cities.(4)
Spot the grammatical errors in the given sentence. Mark the part with error as your answer. If there is no error, mark "No error" as the answer. (Ignor...
The need for education(1)/ to play an effective role(2)/ for nurturing “cultures of peace” (3)/is internationally acknowledged.(4)
1.A good leader is one whom presence is barely known or felt.
2.Who is a good leader?
3. Hierarchies are necessary and we cannot function ...
Critics often site the potential (A)/for these funds to trade (B)/at a share price that is not aligned (C)/with the value of the underlying securities (...
With the growing demand for electric vehicles, (1) / automakers are investing heavily (2) / on research and development (3)/ to improve battery technolo...
Relevant for Exams:
