Civil Engineering - UPSC Civil Service Exam Questions - Discussion


A mild steel bar is in three parts, each 20 cm long. The diameters of parts AB, BC and CD are 2 cm, 1 cm and 3 cm respectively.

The bar is subjected to an axial pull of 4t as shown in the given figure. If E = 2 x 106 kg/cm2 and the elongations in the three parts of the bar are Δ1, Δ2 and Δ3 respectively, then the ratio of the greatest to the least of these elongations will be

[A]. 9
[B]. 4
[C]. 3
[D]. 2

Answer: Option C


No answer description available for this question.

Chhaya said: (May 16, 2017)  
Answer should be A.

Because elongation is inversely proportional to Area here is given diameter.

Sujatha said: (Oct 27, 2020)  
Please explain this.

Rocky Bhai said: (Jun 26, 2021)  
Yes, A is the right answer.

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