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This set of Strength of Materials Multiple Choice Questions & Answers (MCQs) focuses on Strength Of Materials Set 18
Q1 | The shear stress at the outermost fibres of a circular shaft under torsion is
- zero
- minimum
- maximum
- infinity
Q2 | A shaft of diameter D is subjected to a twisting moment (T) and a bending moment (M). If the maximum bending stress is equal to maximum shear stress developed, then M is equal to
- T / 2
- T
- 2 T
- 4 T
Q3 | Which of the following statement is correct?
- The size of hole drilled in riveting plates is less than the actual size of rivet.
- The centre to centre distance between two consecutive rivets in a row is called margin.
- Rivets are generally specified by its shank diameter
- Tearing of plates can be avoided by taking the pitch of rivets equal to 1.5 times the diameter of rivet hole.
Q4 | A bolt is made to pass through a tube and both of them are tightly fitted with the help of washers and nuts. If the nut is tightened, then
- bolt and tube are under tension
- bolt and tube are under compression
- bolt is under compression and tube is under tension
- bolt is under tension and tube is under compression
Q5 | The thermal stress
- depends
- does not depend
Q6 | When a bar is subjected to a change of temperature and its deformation is prevented, the stress induced in the bar is
- tensile stress
- compressive stress
- shear stress
- thermal stress
Q7 | When a material is loaded within elastic limit, the material will regain its shape and size when the load is removed.
- Agree
- Disagree
Q8 | When a bar of length l, width b and thickness t is subjected to a pull of P, its
- length, width and thickness increases
- length, width and thickness decreases
- length increases, width and thickness decreases
- length decreases, width and thickness increases
Q9 | A beam of uniform strength has
- same cross-section throughout the beam
- same bending stress at every section
- same bending moment at every section
- same shear stress at every section
Q10 | In the above question, the ratio of stiffness of spring 'B' to spring 'A' will be
- 2
- 4
- 6
- 8
Q11 | A load which is spread over a beam in such a manner that it varies uniformly over the whole length of a beam is called uniformly
- distributed
- varying
Q12 | Which of the following statement is wrong?
- In the theory of simple bending, the assumption is that the plane sections before bending remains plane after bending.
- In a beam subjected to bending moment, the strain is directly proportional to the distance from te neutral axis.
- At the neutral axis of a beam, the bending stress is maximum
- The bending stress in a beam is inversely proportional to the section modulus
Q13 | Which of the following statement is correct?
- A continuous beam has only two supports at the ends
- A uniformly distributed load spreads uniformly over the whole length of a beam.
- The bending moment is maximum where whear force is maximum.
- The maximum bending moment of a simply supported beam of length l with a central point load W is W l/8.
Q14 | A fixed beam is one which is fixed at
- One
- both
Q15 | On one side of a neutral axis of a beam, there is a tensile stress and on the other side of the beam there is a compressive stress
- Agree
- Disagree
Q16 | If the magnitude of direct stress and bending stress is equal, then there will be zero stress at one of the extreme ends of a column.
- Agree
- Disagree
Q17 | The ratio of the lateral strain to the linear strain is called
- modulus of elasticity
- modulus of rigidity
- bulk modulus
- Poisson's ratio
Q18 | The bending moment diagram for a cantilever beam of length l and carrying a gradually varying load from zero at the free end and w per unit length at the fixed end is a parabolic curve.
- Agree
- Disagree
Q19 | A simply supported beam 'A' of length l, breadth b and depth d carries a central load W. Another beam 'B' of the same dimensions carries a central load equal to 2 W. The deflection of beam 'B' will be
- one-fourth
- one-half
- double
- four times
Q20 | A simply supported beam 'A' of length l, breadth b and depth d carried a central point load W. Another bream 'B' has the same length and breadth but its depth is doubled. The deflection of beam 'B' will be double as compared to beam 'A'.
- Right
- Wrong
Q21 | A flitched beam is used to
- change the shape of the beam
- effect the saving in material
- equalise the strength in tension and compression
- increase the cross-section of the beam
Q22 | The volumetric strain is the ratio of the
- original thickness to the change in thickness
- change in thickness to the original thickness
- original volume to the change in volume
- change in volume to the original volume
Q23 | A concentrated load is one which
- acts at a point on a beam
- spreads non-uniformly over the whole length of a beam
- spreads uniformly over the whole length of a beam
- varies uniformly over the whole length of a beam
Q24 | A simply supported beam is one which is supported on more than two supports.
- True
- False
Q25 | For the above question, the minimum normal stress will be
- ? 100 MPa
- 250 MPa
- 300 MPa
- 400 MPa