Strength Of Materials Set 4

Mechanical Engineering

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This set of Strength of Materials Multiple Choice Questions & Answers (MCQs) focuses on Strength Of Materials Set 4

Q1 | The axial force in the portion BC of the member shown in Fig. 1.1 is kN.
  • 50
  • -50
  • 40
  • -40
Answer: -40
Q2 | If the member shown in Fig. 1.1 has asquare cross section of 25 mm 25 mm and E = 200 GPa, the change in length of portion CD is ------mm
  • 0.16
  • -0.16
  • 0.24
  • -0.24
Answer: -0.16
Q3 | The axially loaded composite rod shown in Fig. 1.2 has a uniform cross- sectional area of 500 mm 2 . The modulii of elasticity are Est = 200 GPa, Eal = 70 GPa and Ecu = 120 GPa. The change in length of CD is mm.
  • 0.15
  • -0.15
  • 0.24
  • -0.24
Answer: 0.15
Q4 | The axially loaded composite rod shown in Fig. 1.2 has a uniform cross- sectional area of 500 mm 2 . The modulii of elasticity are Est = 200 GPa, Eal = 70 GPa and Ecu = 120 GPa. The change in length of the composite rod is mm.
  • 0.95
  • -0.95
  • 0.5
  • -0.5
Answer: -0.95
Q5 | For the stepped rod shown in Fig. 1.3, the stress is maximum in .
  • aluminum
  • copper
  • steel
  • none of these
Answer: steel
Q6 | For the stepped rod shown in Fig. 1.3,the in .
  • aluminum
  • copper
  • steel
  • none of these
Answer: aluminum
Q7 | A steel bar ABC (E = 200 GPa) is 1 m long. For AB = 0.7 m, it has cross section P area of 500 mm2 and for BC = 0.3 m the cross section area is 400 mm2. The bar is subjected to an axial pull of 100 kN. The stress is maximum in ___ _
  • ab
  • bc
  • same throughout
  • none of these
Answer: bc
Q8 | A stepped bar of steel consists of a pmormtion with cross section area 500 mm2 connected to a portion with cross section area 1000 2. Each portion has a length of 1 m. The modulus of elasticity of steel is200 GPa. The maximum elongation of the bar by applying an axial tensile force at the ends without exceeding a stress of 100 MPa is   mm.
  • 0.5
  • 0.75
  • 0.1
  • 0.15
Answer: 0.75
Q9 | The change in length of a rod of uniform circular cross section was found to be 2 mm for some applied force. The change in length of a rod of the same material and length but of half the diameter subjected to the same force will be Mm
  • 1
  • 2
  • 0.5
  • 4
Answer: 4
Q10 | A strip of steel (E = 200 GPa, 0.25) has a length of 1 m, width of200 mm and thickness of 10 mm. A line of length 1 m is drawn parallel to its length on one of its side surfaces. When the strip is subjected to an axial tensile force of100 kN, the length of the line will be                 mm.
  • 1000
  • 1000.25
  • 999.25
  • 0.25
Answer: 1000.25
Q11 | The change in length of a rod of uniform cross section was found to be2 mm for some applied force. The change in length of a rod of the same material and length but of twice the cross section area subjected to the same force will be__ mm.
  • 1
  • 2
  • 0.5
  • 4
Answer: 1
Q12 | Two rods have uniform cross section areas in the ratio 1 : 2 and are subjected to axial tensile forces with magnitudes in the ratio 2 : 1. The stresses induced in the two rods will be in the ratio ____ _.
  • 1 : 2
  • 2 : 1
  • 1 : 1
  • 4 : 1
Answer: 4 : 1
Q13 | Two rods have uniform cross section areas in the ratio 1 : 2 and are subjected to axial tensile forces with magnitudes in the ratio 1 : 2. The stresses induced in the two rods will be in the ratio ____ _.
  • 1:1
  • 1:2
  • 1:1
  • 4:1
Answer: 1:1
Answer: 1:1
Q14 | Two rods have uniform cross section areas in the ratio 1 : 2 and are subjected to axial tensile forces of the same magnitude. The stresses induced in the two rods will be in the ratio __ _ .
  • 1 : 2
  • 2 : 1
  • 1 : 1
  • 4 : 1
Answer: 2 : 1
Q15 | If an axial force of 15 kN is applied to a rod of 25 mm diameter, length 300 mm, the change in length of the rod was observed to be 0.045 mm. The modulus of elasticity of the material is 200 GPa. The strain in the rod will be ____ _.
  • 1.5
  • 1.5*10-4
  • 1.33*10-3
  • 0.0455
Answer: 1.5*10-4
Q16 | If an axial force of 1 kN is applied to a rod of 100 mm cross section area produces change in length of 1 mm over a length of 12 m, the modulus of elasticity of the material will be---------
  • 120mpa
  • 10gpa
  • 12gpa
  • 120gpa
Answer: 120gpa
Q17 | If an axial force of 1 kN is applied to a rod of 100 mm2cross section area, length 5 m and the modulus of elasticity of the material is 100 GPa, the change in length of the rod will be ___ .
  • 1mm
  • 1.2mm
  • 0.5mm
  • 0.25mm
Answer: 0.5mm
Q18 | The longitudinal stress developed in a rod of cross section area 50 mm2 is 100 MPa. The force acting along its axis is -------
  • 2n
  • 2.5kn
  • 5n
  • 5.5kn
Answer: 5.5kn
Q19 | If an axial force of 1 kN is applied to a steel rod of 100 mm2 cross section area, the stress in it will be ___ .
  • 10mpa
  • 10gpa
  • 1mpa
  • 1gpa
Answer: 10mpa
Q20 | Two equal and opposite forces of magnitude 10 kN are applied at the ends of a steel wire to increase its length. The internal force in thewire will be-----KN
  • 0
  • 10
  • 20
  • 15
Answer: 10
Q21 | The value of factor of safety is always__ _.
  • >1
  • <1
  • 1
  • 0
Answer: >1
Q22 | The value of margin of safety is always__ _.
  • >1
  • <1
  • 1
  • 0
Answer: 0
Q23 | The radius of wire stretched by a load is doubled, then its Modulus of elasticity will be..
  • doubled
  • halved
  • becomes 4 times
  • unaffected
Answer: unaffected
Q24 | The factor of safety depends on i)Magnitude of external forceii) Properties of materialiii) Dimension of the componentiv) All of the above
  • i) and ii)
  • ii) and iii)
  • i) , ii) and iii)
  • iv
Answer: iv
Q25 | The thermal stress is given by where α = coeffeicient of linear expansionT = Rise in temperature
  • eαt
  • et/α
  • eα/t
  • 1/eαt
Answer: eαt
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