Railways Technical Ability Engineering Mechanics and Strength of Materials Question Bank Strength of Materials

  • question_answer A steel rod of 1 sq. cm. cross sectional area is 100 cm long and has a Young's modulus of elasticity \[2\times {{10}^{6}}\,\text{kg/c}{{\text{m}}^{\text{2}}}.\]it is subjected to an axial pull of 2000 kgf. The elongation of the rod will be:

    A) 0.05 cm            

    B) 0.1 cm

    C) 0.15 cm            

    D) 0.20 cm

    Correct Answer: B

    Solution :

    \[A=1\,\,c{{m}^{2}},\] l=100 cm, \[E=2\times {{10}^{6}}\text{kgf/c}{{\text{m}}^{\text{2}}}\] W=2000 kgf \[dt=\frac{Wl}{AE}=\frac{2000\times 100}{1\times 2\times {{10}^{6}}}=0.1cm\]

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