### Structural Mechanics Set 3

This set of Structural Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Structural Mechanics Set 3

Q1 | Which type of load is applied in tensile testing?
Q2 | Which law is also called as the elasticity law?
• Bernoulli’s law
• Stress law
• Hooke’s law
• Poisson’s law
Q3 | The materials which have the same elastic properties in all directions are called __________
• Isotropic
• Brittle
• Homogeneous
• Hard
Q4 | The calculation of the moment of the body due to the loadings involve a quantity called ____________
• Moment
• Inertia
• Moment of Inertia
• Rotation
Q5 | Moment of Inertia is the integration of the square of the distance of the centroidand the del area along the whole area of the structure.
• TRUE
• FALSE
• none
• all
Q6 | What is parallel axis theorem and to whom it is applied?
• Theorem used to add the two mutually perpendicular moment of inertias for areas
• Theorem used to add the two mutually perpendicular moment of inertias for volumes
• Theorem used to add the two mutually perpendicular moment of inertias
• Theorem used to add the two mutually perpendicular moment of inertias for vectors
Q7 | The parallel axis theorem gives the moment of inertia ______________ to the surface of considerance.
• Linear
• Non-Linear
• Perpendicular
• Parallel
Q8 | In the calculation of the radius of gyration, we use intensity of loadings. So whenever the distributed loading acts perpendicular to an area its intensity varies __________
• Linearly
• Non-Linearly
• Parabolically
• Cubically
Q9 | Elongation of a bar of uniform cross section of length „L?, due to its own weight „W? is given by
• 2WL/E
• WL/E
• WL/2E
• WL/3E
Q10 | steel bar 10 mm x 10 mm cross section is subjected to an axial tensile load of 20kN. If the length of bar is 1 m and E = 200 GPa, then elongation of the bar is:
• 1 mm
• 0.5 mm
• 0.75 mm
• 1.5 mm
Q11 | The modulus of rigidity and poisson?s ratio of a material are 80 GPa and 0.3 respectively. Its young?s modulus will be
• 160 GPa
• 208 GPa
• 120 GPa
• 104 GPa
Q12 | If the value of poisson?s ratio is zero
• the lateral strain is high
• the material is perfectly elastic
• there is no linear strain in the material
• none of the above
Q13 | The ratio between direct stress and volumetric strain is:
• Bulk modulus
• Poisson’s ratio
• Factor of safety
• Modulus of rigidity
Q14 | Young?s modulus of a material which gives 2 kN/mm2 stress at 0.01 strainis
• 20kN/mm2
• 0.02kN/mm2
• 200 kN/mm2
• 2000kN/mm2
Q15 | The Young?s modulus of elasticity of a material is 2.5 times its modulus of rigidity. The Poisson?s ratio for the material will be
• 0.25
• 0.33
• 0.5
• 0.75
Q16 | Consider a 250mmx15mmx10mm steel bar which is free to expand is heated from 150C to 400C. what will be developed?
• Compressive stress
• Tensile stress
• Shear stress
• No stress
Q17 | The safe stress for a hollow steel column which carries an axial load of 2100 kN is 125 MN/m2. if the external diameter of the column is 30cm, what will be the internal diameter?
• 25 cm
• 26.19cm
• 30.14 cm
• 27.9 cm
Q18 | The percentage reduction in area of a cast iron specimen during tensile test would be of the order of
• more than 50%
• 25—50%
• 10—25%
• negligible.
Q19 | In a tensile test, near the elastic limit zone, the
• tensile strain increases more quickly
• tensile strain decreases more quickly
• tensile strain increases in proportion to the stress
• tensile strain decreases in proportion to the stress
Q20 | The stress necessary to initiate yielding is
• considerably greater than that necessary to continue it
• considerably lesser than that necessary to continue it
• greater than that necessary to stop it
• lesser than that necessary to stop it
Q21 | Rupture stress is
• breaking stress
• load at breaking point/neck area
Q22 | stress at which extension of material takes place more quickly as comparedto increase in load is called
• elastic point of the material
• plastic point of the material
• breaking point of the material
• yielding point of the material
Q23 | The energy absorbed in a body, when it is strained within the elastic limits,is known as
• strain energy
• resilience
• proof resilience
• modulus of resilience
Q24 | Resilience of a material is considered when it is subjected to
• frequent heat treatment
• fatigue
• creep