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This set of Strength of Materials Multiple Choice Questions & Answers (MCQs) focuses on Strength Of Materials Set 23
Q1 | When a body is subjected to a direct tensile stress (?) in one plane, then maximum normal stress occurs at a section inclined at
- 0?
- 30?
- 45?
- 90?
Q2 | The object of caulking in a riveted joint is to make the joint
- free from corrosion
- stronger in tension
- free from stresses
- leak-proof
Q3 | The tensile test is carried on
- ductile
- brittle
- malleable
- plastic
Q4 | The critical neutral axis of a reinforced cement concrete beam is based on the principle that the neutral axis is situated at the centre of gravity of a given section.
- True
- False
Q5 | Transverse fillet welds are designed for
- tensile strength
- compressive strength
- shear strength
- bending strength
Q6 | Lame's theory is associated with
- thin cylindrical shells
- thick cylindrical shells
- direct and bending stresses
- none of these
Q7 | Two solid shafts 'A' and 'B' are made of the same material. The shaft 'A' is of 50 mm diameter and shaft 'B' is of 100 mm diameter. The strength of shaft 'B' is
- one-half
- double
- four times
- eight times
Q8 | The bending moment in the centre of a simply supported beam carrying a uniformly distributed load of w per unit length is
- zero
- wl2 / 2
- wl2 / 4
- wl2 / 8
Q9 | When a body is subjected to a direct tensile stress (?) in one plane, then normal stress on an oblique section of the body inclined at an angle ? to the normal of the section is
- ? cos ?
- ? cos2 ?
- ? sin ?
- ? sin2 ?
Q10 | Two bars of different materials and same size are subjected to the same tensile force. If the bars have unit elongation in the ratio of 2 : 5, then the ratio of modulus of elasticity of the two materials will be
- 2 ; 5
- 5 ; 2
- 4 ; 3
- 3 ; 4
Q11 | When a shaft is subjected to torsion, the shear stress induced in the shaft varies from
- manimum at the centre to maximum at the circumference
- maximum at the centre to minimum at the circumference
- zero at the centre to maximum at the circumference
- maximum at the centre of zero at the circumference
Q12 | Whenever a material is loaded within elastic limit, stress is
- equal to
- directly proportional to
- inversely proportional to
Q13 | A beam supported on more than two supports is called
- simply supported beam
- fixed beam
- overhanging beam
- continuous beam
Q14 | A rectangular beam of length l supported at its two ends carries a central point load W. The maximum deflection occurs
- at the ends
- at l / 3 from both ends
- at the centre
- none of these
Q15 | If the diameter of pressure vessel is 15 times the wall thickness, the vessel is said to be a thick shell.
- Agree
- Disagree
Q16 | Modulus of resilience is the proof resilience per unit volume of a material.
- Correct
- Incorrect
Q17 | A column is said to be a short column, when
- its length is very small
- its cross-sectional area is small
- the ratio of its length to the least radius of gyration is less than 80.
- the ratio of its length to the least radius of gyration is more than 80.
Q18 | If there is a fall in the temperature of a composite body, then a member having greater coefficient of linear expansion will be subjected to compressive stress.
- True
- False
Q19 | The Rankine's theory for active earth pressure is based on the assumption that
- the retained material is homogeneous and cohesionless
- the frictional resistance between the retaining wall and the retained material is neglected
- the failure of the retained material takes place along a plane called rupture plane
- all of the above
Q20 | The vertical column has two moments of inertia (i.e Ixx and Iyy). The column will tend to buckle in the direction of the
- axis of load
- perpendicular to the axis of load
- maximum moment of inertia
- minimum moment of inertia
Q21 | The modulus of elasticity for mild steel is approximately equal to
- 10 kN/mm2
- 80 kN/mm2
- 100 kN/mm2
- 210 kN/mm2
Q22 | Two beams, one of circular cross-section and the other of square cross-section, have equal areas of cross-sections. When these beams are subjected to bending.
- both beams are equally economical
- square beam is more economical
- circular beam is more economical
- none of these
Q23 | If percentage elongation of a certain specimen made of a material 'A' under tensile test is 30% and the percentage elongation of a specimen with same dimensions made of another material 'B' is 40%, then material 'B' is more ductile than material 'A'.
- Right
- Wrong
Q24 | Principle plane is a plane on which the shear stress is
- zero
- minimum
- maximum
Q25 | If the slenderness ratio for a column is 100, then it is said to be a
- long
- medium
- short