Strength of Materials Questions and Answers – Bars of Composite Sections – 1

This set of Strength of Materials Multiple Choice Questions & Answers (MCQs) focuses on “Bars of Composite Sections – 1”.

1. If a bar of sections of two different length and different diameters are in a line and P load is acting axially on them then what will be the change in length of the bar?
a) P/E x (L₁ + L₂)
b) P/E x (A₁/L₁ + A₂/ L₂)
c) P/E x (L₁/A₁ + L₂/A₂)
d) E/P x (L₁/A₁ + L₂/A₂)
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2. How does the elastic constant varys with the elongation of body?
a) The elastic constant is directly proportional to the elongation
b) The elastic constant is directly proportional to the elongation
c) The elongation does not depends on the elastic constant
d) None of these
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3. A composite rod is 1000mm long, its two ends are 40 mm² and 30mm² in area and length are 400mm and 600mm respectively. If the rod is subjected to an axial tensile load of 1000N, what will be its total elongation(E = 200GPa)?
a) 0.130m
b) 0.197mm
c) 0.160mm
d) 0.150mm
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4. A mild steel wire 5mm in diameter and 1m ling. If the wire is subjected to an axial tensile load 10kN what will be its extension?
a) 2.55mm
b) 3.15mm
c) 2.45mm
d) 2.65mm
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5. A composite rod is 1000mm long, its two ends are 40mm² and 30mm² in area and length are 300mm and 200mm respectively. The middle portion of the rod is 20mm² in area. If the rod is subjected to an axial tensile load of 1000N, what will be its total elongation (E = 200GPa)?
a) 0.145mm
b) 0.127mm
c) 0.187mm
d) 0.196mm
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6. A rod of two sections of area 625mm² and 2500mm² of length 120cm and 60cm respectively. If the load applied is 45kN then what will be the elongation (E = 2.1x 105 N/mm²)?
a) 0.462mm
b) 0.521mm
c) 0.365mm
d) 0.514mm
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7. What will be the elongation of a bar of 1250mm² area and 90cm length when applied a force of 130kN if E = 1.05x 105 N/mm²?
a) 0.947mm
b) 0.891mm
c) 0.845mm
d) 0.745mm
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8. A bar shown in diagram is subjected to load 160kN. If the stress in the middle portion Is limited to 150N/mm2, what will be the diameter of the middle portion?

a) 3.456 cm
b) 3.685 cm
c) 4.524 cm
d) 4.124 cm
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9. A steel bar of 20mm x 20mm square cross-section is subjected to an axial compressive load of 100kN. If the length of the bar is 1m and E=200GPa, then what will be the elongation of the bar?
a) 1.25mm
b) 2.70mm
c) 5.40mm
d) 4.05mm
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10. A solid uniform metal bar is hanging vertically from its upper end. Its elongation will be _________
a) Proportional to L and inversely proportional to D²
b) Proportional to L² and inversely proportional to D
c) Proportional of U but independent of D
d) Proportional of L but independent of D
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Sanfoundry Global Education & Learning Series – Strength of Materials.

To practice all areas of Strength of Materials, here is complete set of 1000+ Multiple Choice Questions and Answers.

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