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This set of Strength of Materials Multiple Choice Questions & Answers (MCQs) focuses on Strength Of Materials Set 24
Q1 | A twisting couple in a shaft induces in the shaft
- Shear stress
- Bending moment
- Deflection
- All of the above
- None of the above
Q2 | The ratio of hoop stress to longitudinal stress for thin spherical shells is
- 2
- There is no such ratio for spherical shells
Q3 | An unknown weight falls through 1 cm on a collar rigidly attached to the lower end of a vertical bar 3 m long and 6 m2 in section. If the maximum instantaneous extension is 2 mm the value of stress would be
- 1500 kg/cm2
- 500 kg/cm2
- 1000 kg/cm2
- 1333 kg/cm2
- 667 kg/cm2
Q4 | The neutral axis of a transverse section of a beam passes through the centre of gravity of the section and is
- At right angles to the plane in which the beam bends
- In the same plane in which beam bends
- In the vertical plane
- In the horizontal plane
- None of the above
Q5 | The local strain energy at a point in a material when shear stress is 80 MN/m2 and G = 27 GN/m2 will be nearly
- 58.5 kJ/m3
- 118.5 kJ/m3
- 438.5 kJ/m3
- 2348 kJ/m2
- None of the above
Q6 | If shear force is zero along a section, the bending moment at that section will be
- Minimum
- Maximum
- There is no correlation between the two
- Minimum or Maximum
- Zero
Q7 | The rod of a ceiling fan is subjected to
- compressive stress
- tensile stress
- shear stress
- torsional stress
- None of the above
Q8 | The compression members tend to buckle in the direction of their
- Axis of load
- Perpendicular to the axis of load
- Minimum cross-section
- Least radius of gyration
- None of the above
Q9 | The percentage reduction of area during tensile test on a cast iron specimen may be
- Negligible
- 25%
- 50%
- 5%
- 10%
Q10 | The web bukling in beams may be avoided by
- stiffening the web
- limiting the stress that can be used
- increasing the span
- any of the above methods
- None of the above
Q11 | If the rod in problem 165 stands erected vertically upwards then it will be known as
- Short column
- Strut
- Long column
- Medium column
- None of the above
Q12 | Which of the following materials can be used for absorption of shock?
- Rubber
- Wood
- sawdust
- Lead sheet
- Any of the above
Q13 | In a compression test the fracture in cast iron specimen would occur along
- An oblique plane
- Along the axis of load
- A light angles to the specimen axis
- Fracture will not occur in cast iron
- None of the above
Q14 | Shear stresses on mutually perpendicular planes are
- Equal
- Maximum
- Minimum
- Zero
- Unequal
Q15 | The weakness section of a diamond riveting is the section which passes through
- End row with one rivet only
- Row with maximum rivets
- All rows have same strength
- The first row
- Middle row
Q16 | A 10 mm mild steel rod 40 min long lying on ground will be known as
- Short column
- Long column
- Strut
- Medium column
- None of the above
Q17 | Torsional rigidity is
- The torque that produces rotation of unit r.p.m. in a shaft
- The torque that transmits one HP at one r.p.m.
- The torque that produces a twist of one radian in a shaft of unit diameter
- The torque that produces a twist of one radian in a shaft of unit length
- None of the above
Q18 | A portion of a beam between two sections is said to be in pure bending when there is
- constant bending moment and constant shear force
- constant shear force and zero bending mement
- constant bending moment and zero shear force
- zero bending moment and zero shear force
- None of the above
Q19 | A self-supporting steel chimney transmits the lateral forces to the foundation by
- propped beam action
- cantilever action
- simply supported beam action
- fixed beam action
- None of the above
Q20 | The moment of inertia of an area will be least with respect to
- Vertical axis
- Moment of area does not depend on axes
- Moment of area is same through all axes
- Central axis
- Horizontal axis
Q21 | A hole, one metre from the end of a structural steel member, is 0.8 mm shy of matching another hole for possible connection. What force, in kN, is necessary to stretch it for connection? The cross section is 25 mm x 3 mm
- 12.6
- 13.6
- 14.7
- 15.8
- None of the above
Q22 | Two rods A and B are subjectd to equal load P. Rod A is tapering with bigger diameter D at the support and small end diameter as D/2. Rod B is of uniform cross section with diameter D. The ratio of elongation of rod A to that of B would be
- 4
- 2
- 1
- None of the above
Q23 | A beam supporting a uniformly distributed load over its entire length L is pinned at one end and passes over a roller support at a distance x from the other end. The value of x such that the greatest bending moment in the beam is as small as possible, will be
- 0.111 L
- 0.2 L
- 0.125 L
- 0.33 L
- 0.293 L
Q24 | Hoop stress is
- Circumferential tensile stress
- Compressive stress
- Radial stress
- Longitudinal stress
- None of the above
Q25 | A composite spring is made by joining two springs end to end one spring having twice the stiffness of the other. The ratio of the stiffness of the composite spring to that of the stiffness of the two springs could be
- ?
- 2
- 3
- 3?2
- ?