Strength Of Materials Set 3

Mechanical Engineering

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This set of Strength of Materials Multiple Choice Questions & Answers (MCQs) focuses on Strength Of Materials Set 3

Q1 | If D is the diameter of the sphere, then volumetric strain is equal to
  • two times the strain of diameter
  • 1.5 times the strain of diameter
  • three times the strain of diameter
  • the strain of diameter
Answer: three times the strain of diameter
Q2 | If L be the length and D be the diameter of cylindrical rod, then volumetric strain of the rod is equal to
  • strain of length plus strain of diameter
  • strain of diameter
  • strain of length plus twice the strain of diameter
  • strain of length
Answer: strain of length plus twice the strain of diameter
Q3 | the extension per unit length of the rod due to suddenly applied load as compare to same load gradually applied to same rod is
  • same
  • double
  • three times
  • half
Answer: double
Q4 | The tensile force at a distance y from support in a vertical hanging bar of length L whch carries a load P at the bottom is equal to---- where w = weight per unit length
  • p
  • p+wl
  • p+w(l-y)
  • p+wy
Answer: p+w(l-y)
Q5 | Total elongation produced in a bar due to its self weight is given by……….. Where ρ is the density of material in kg/m3
  • 9.81ρl2/e
  • 9.81ρl2/2e
  • 9.81ρl/e
  • 9.81ρ2l/2e
Answer: 9.81ρl2/2e
Q6 | The elongation of circular tapered rod is given by…………. Where P=axial pulland d1, d2= diameters at two ends.
  • 4pl/πed1d2
  • 2pl/πed1d2
  • 4pl/ed1d2
  • 4p2l/ed1d2
Answer: 4pl/πed1d2
Q7 | If a bar of length L m extends by l mm under load W, the strain is
  • 1000 l/l
  • l/l
  • 0.001 l/l
  • none of the above
Answer: 0.001 l/l
Q8 | Four wires of same material are applied the same load. In which of the following cases, the elongation will be maximum (length, diameter)?
  • 2m, 1mm
  • 4m, 2mm
  • 8m, 4mm
  • 12m, 6mm
Answer: 2m, 1mm
Q9 | If ES = 3 EA , the stress in steel of a composite bar made of aluminium and steel strips each having a cross sectional area of 300 mm2 and subjected to an axial load of 12 kN
  • 10mpa
  • 20mpa
  • 30mpa
  • 40mpa
Answer: 30mpa
Q10 | The modulus of rigidity in terms of modulus of elasticity is given by
  • e/2(1-γ)
  • e/2(1+γ)
  • 2e/(1-γ)
  • 2e/(1+γ)
Answer: e/2(1+γ)
Q11 | The modulus of elasticity in terms of bulk modulus is given by
  • 3k/(1+2γ)
  • 3k(1+2γ)
  • 3k/(1-2γ)
  • 3k(1-2γ)
Answer: 3k(1-2γ)
Q12 | The ratio of Young's modulus and bulk modulus is given by
  • 3/(1+2γ)
  • 3(1+2γ)
  • 3/(1-2γ)
  • 3(1-2γ)
Answer: 3(1-2γ)
Q13 | The modulus of elasticity in terms of bulk modulus and modulus of rigidity is given by
  • 9kg/(3k+g)
  • 9kg/(k+3g)
  • (3k+g)/9kg
  • (k+3g)/9kg
Answer: 9kg/(3k+g)
Q14 | For a Poisson's ratio of 0.4 for a material the ratio of shear modulus of elasticity to modulus of rigidity is
  • 14/5
  • 5/7
  • 7/5
  • 5/14
Answer: 5/14
Q15 | A material has modulus of rigidity equal to 0.4x105 N/mm2 and Bulk modulus equal to 0.95 x105 N/mm2 The Young’s modulus value in GPa is..
  • 115
  • 105
  • 145
  • 175
Answer: 105
Q16 | A bar of 30 mm diameter is subjected to an axial force 280 KN length of bar is 400 m and E= 200GPa. Determine volumetric strain if m=4.
  • 1.46x10-3
  • 9.9 x 10-4
  • 2.9 x 10-3
  • 1.48 x 10-4
Answer: 9.9 x 10-4
Q17 | A rail 20 m long is prevented from expansion at both end . If the temperature is raised by 30 0C, Stress induced in rail is.. E=200 Gpa,α =12x10-6/°C
  • 24 mpa
  • 48mpa
  • 72mpa
  • 94mpa
Answer: 72mpa
Q18 | 10. A tensile material is having Young’s modulus 2.1 x105 N/mm2 and modulus of Rigidity is 0.82 x105 N/mm2. The value of Bulk Modulus is ..
  • 1.4 x105 n/mm2
  • 1.6 x105 n/mm2
  • 1.81 x105 n/mm2
  • 1.5 x105 n/mm2
Answer: 1.6 x105 n/mm2
Q19 | A steel rod of length is manufactured at a temperature 200C and its temperature increases upto 1350C.What are thermal stresses induced?E=200Gpa,α=12*10-6/0C
  • 312mpa
  • 310mpa
  • 320mpa
  • 276mpa
Answer: 276mpa
Q20 | A steel rod of 3m is manufactured at 250C the temperature of rod is increases to 1250C. If free expansion is 3.6mm, what is the temperature stresses produced if 1.5mm expansion is permitted?
  • 100mpa
  • 200mpa
  • 150mpa
  • 140mpa
Answer: 140mpa
Q21 | A steel rod of 3m length is manufactured at 250C the temperature of this rod increases to 1250C. What is the free expansion? Take E=200Gpa,α=12*10-6/0C,diameter=12mm
  • 3.2mm
  • 2.6mm
  • 4mm
  • 3.6mm
Answer: 3.6mm
Q22 | A steel tube (E = 200 GPa) has an internal diameter of 40 mm thickness 10 mm and a length of 2 m. If it is subjected to an axial pull of 80 kN, the stress in the tube will be__ _MPa.
  • 28.3
  • 50.13
  • 84.88
  • 113.18
Answer: 50.13
Q23 | A steel tube (E= 200Gpa) has an internal diameter of 40 mm, thickness 10 mm and a length of 2 m. If it is subjected to an axial pull of 80 kN, the change in length of the tube will be__ _mm.
  • 0.283
  • 0.5
  • 0.85
  • 0.113
Answer: 0.5
Q24 | The axial force in the portion AB of the member shown in Fig. 1.1 is kN.
  • 50
  • -50
  • 40
  • -40
Answer: 50
Q25 | If the member shown in Fig. 1.1 has a square cross section of 25 mm25 mm and E = 200 GPa, the change in length of portion AB is             mm.
  • 0.24
  • -0.24
  • 0.32
  • -0.32
Answer: 0.24
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