Strength Of Materials Set 11

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This set of Strength of Materials Multiple Choice Questions & Answers (MCQs) focuses on Strength Of Materials Set 11

Q1 | A body is subjected to two normal stresses 20 kN / m2 (tensile) and 10 kN / m2 (compressive) acting perpendicular to each other. The maximum shear stress is
  • 5 kN / m2
  • 10 kN / m2
  • 15 kN / m2
  • 20 kN / m2
Q2 | In order to avoid sliding of masonry dam, the force of friction between the dam and soil should be at least
  • equal to
  • 1.5 times
  • double
  • 2.5 times
Q3 | In a beam of uniform strength, the bending stress developed is constant and is equal to the allowable stress at every section of the beam.
  • True
  • False
Q4 | The rectrangular beam 'A' has length l, width b and depth d. Another beam 'B' has the same length and depth but width is double that of 'A'. The elastic strength of beam B will be
  • same
  • double
  • four times
  • six times
Q5 | A rod is enclosed centrally in a tube and the assembly is lightened by rigid washers. If the assembly is subjected to a compressive load, then
  • rod is under compression
  • tube is under compression
  • both rod and tube are under compression
  • rube is under tension and rod is under compression
Q6 | The shear force 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
Q7 | A beam of triangular section is placed with its base horizontal. The maximum shear stress occurs at
  • apex of the triangle
  • mid of the height
  • centre of gravity of the triangle
  • base of the triangle
Q8 | The stress developed in the material without any permanent set is called
  • elastic limit
  • yield stress
  • ultimate stress
  • breaking stress
Q9 | The ductility of a material
  • increases
  • decreases
  • remains same
Q10 | The rectrangular beam 'A' has length l, width b and depth d. Another beam 'B' has the same length and width but depth is double that of 'A'. The elastic strength of beam B will be
  • same
  • double
  • four times
  • six times
Q11 | A bar of length L metres extends by l mm under a tensile force of P. The strain produced in the bar is
  • l / L
  • 0.1 l / L
  • 0.01 l / L
  • 0.001 l / L
Q12 | In the Euler's formula, the value of C for a column with one end fixed and the other end free, is
  • 1 ? 2
  • 1
  • 2
  • 4
Q13 | The maximum stress produced in a bar of tapering section is at
  • smaller end
  • larger end
  • middle
  • anywhere
Q14 | In a thin cylindrical shell subjected to an internal pressure p, the ratio of longitudinal stress to the hoop stress is
  • 1 ? 2
  • 3 ? 4
  • 1
  • 1.5
Q15 | When two shafts of same length, one of which is hollow, transmit equal torques and have equal maximum stress, then they should have equal
  • polar moment of inertia
  • polar modulus
  • diameter
  • angle of twist
Q16 | In a simple bending theory, one of the assumption is that the material of the beam is isotropic. This assumption means that the
  • normal stress remains constant in all directions
  • normal stress varies linearly in the material
  • elastic constants are same in all the directions
  • elastic constants varies linearly in the material
Q17 | For the two shafts connected in parallel and sub-jected to twisting moment, the angle of twist of each shaft will be same.
  • Yes
  • No
Q18 | A tensile test is performed on a round bar. After fracture it has been found that the diameter remains approximately same at fracture. The material under test was
  • mild steel
  • cast iron
  • glass
  • copper
Q19 | The compressive strength of brittle materials is
  • equal to
  • less than
  • greater than
Q20 | Two shafts 'A' and 'B' transmit the same power. The speed of shaft 'A' is 250 r.p.m. and that of shaft 'B' is 300 r.p.m. The shaft 'B' has the greater diameter.
  • True
  • False
Q21 | A welded joint as compared to a riveted joint has
  • same
  • less
  • more
Q22 | The shear force of a cantilever beam of length l carrying a uniformly distributed load of w per unit length is
  • zero
  • wl / 4
  • wl / 2
  • wl
Q23 | The bending moment at a point on a beam is the algebraic
  • sum
  • difference
Q24 | In the Euler's formula, the value of C for a column with one end fixed and the other end hinged, is 1 / 2.
  • True
  • False
Q25 | The bending moment diagram for a simply supported beam carrying a uniformly distributed load of w per unit length, will be
  • a horizontal line
  • a vertical line
  • an inclined line
  • a parabolic curve