Strength of Materials online Test - Set 27 - ObjectiveBooks

# Practice Test: Question Set - 27

1. The bending moment at a section tends to bend or deflect the beam and the internal stresses resist its bending. The resistance offered by the internal stresses, to the bending, is called
(A) Compressive stress
(B) Shear stress
(C) Bending stress
(D) Elastic modulus

2. A thin cylindrical shell of diameter (d), length (l) and thickness (t) is subjected to an internal pressure (p). The hoop stress in the shell is
(A) pd/t
(B) pd/2t
(C) pd/4t
(D) pd/6t

3. Fatigue test is carried out for
(A) Stresses varying between two limits of equal value, but of opposite sign
(B) Stresses varying between two limits of unequal value, but of opposite sign
(C) Stresses varying between two limits of unequal value but of same sign
(D) All of the above

4. The neutral axis of a beam is subjected to __________ stress.
(A) Zero
(B) Maximum tensile
(C) Minimum tensile
(D) Maximum compressive

5. 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,
(A) Both beams are equally economical
(B) Square beam is more economical
(C) Circular beam is more economical
(D) None of these

6. 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
(A) 5 kN/m²
(B) 10 kN/m²
(C) 15 kN/m²
(D) 20 kN/m²

7. The thermal or temperature stress is a function of
(A) Increase in temperature
(B) Modulus of elasticity
(C) Coefficient of linear expansion
(D) All of these

8. For long columns, the value of buckling load is __________ crushing load.
(A) Equal to
(B) Less than
(C) More than
(D) None of these

9. When a body is subjected to a direct tensile stress (σ) in one plane, then tangential or shear stress on an oblique section of the body inclined at an angle ‘θ’ to the normal of the section is
(A) σ sin 2θ
(B) σ cos 2θ
(C) σ/2 sin 2θ
(D) σ/2 cos 2θ

10. Whenever some external system of forces acts on a body, it undergoes some deformation. As the body undergoes some deformation, it sets up some resistance to the deformation. This resistance per unit area to deformation, is called
(A) Strain
(B) Stress
(C) Pressure
(D) Modulus of elasticity

11. According to Euler's column theory, the crippling load for a column of length (l) with one end fixed and the other end hinged, is
(A) π²EI/l²
(B) π²EI/4l²
(C) 2π²EI/l²
(D) 4π²EI/l²

12. When there is a sudden increase or decrease in shear force diagram between any two points, it indicates that there is a
(A) Point load at the two points
(C) Uniformly distributed load between the two points
(D) Uniformly varying load between the two points

13. According to Euler's column theory, the crippling load for a column of length (l) fixed at both ends is __________ the crippling load for a similar column hinged at both ends.
(A) Equal to
(B) Two times
(C) Four times
(D) Eight times

14. A load which is spread over a beam in such a manner that it varies uniformly over the whole length of abeam is called uniformly ________ load.
(A) Distributed
(B) Varying
(C) Both A and B
(D) None of these

15. Which of the following statement is correct?
(A) A continuous beam has only two supports at the ends.
(B) A uniformly distributed load spreads uniformly over the whole length of a beam.
(C) The bending moment is maximum where shear force is maximum.
(D) The maximum bending moment of a simply supported beam of length l with a central point load W is Wl/8.

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