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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?

- Axial load
- Shear load
- Transverse load
- Longitudinal load

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
- maximum load/original cross-sectional area
- load at breaking point/A
- 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
- shock loading

Q25 | The maximum strain energy that can be stored in a body is known as

- impact energy
- resilience
- proof resilience
- modulus of resilience