Multiple Choice Questions on Strength of Materials - Set 11 - ObjectiveBooks
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# Practice Test: Question Set - 11

1. If the rivets in adjacent rows are staggered and the outermost row has only one rivets, the arrangement of the rivets is called
(A) Chain riveting
(B) Zigzag riveting
(C) Diamond riveting
(D) Crisscross riveting

2. The point of contraflexure is a point where
(A) Shear force changes sign
(B) Bending moment changes sign
(C) Shear force is maximum
(D) Bending moment is maximum

3. The value of shear stress which is induced in the shaft due to the applied couple varies
(A) From maximum at the center to zero at the circumference
(B) From zero at the center to maximum at the circumference
(C) From maximum at the center to minimum at the circumference
(D) From minimum at the center to maximum at the circumference

4. The extremities of any diameter on Mohr's circle represent
(A) Principal stresses
(B) Normal stresses on planes at 45°
(C) Shear stresses on planes at 45°
(D) Normal and shear stresses on a plane

5. The materials having same elastic properties in all directions are called
(A) Ideal materials
(B) Uniform materials
(C) Isotropic materials
(D) Piratical materials

6. The ratio of the largest load in a test to the original cross-sectional area of the test piece is called
(A) Elastic limit
(B) Yield stress
(C) Ultimate stress
(D) Breaking stress

7. A column is said to be a short column, when
(A) Its length is very small
(B) Its cross-sectional area is small
(C) The ratio of its length to the least radius of gyration is less than 80
(D) The ratio of its length to the least radius of gyration is more than 80

8. The total elongation produced in a bar of uniform section hanging vertically downwards due to its own weight is equal to that produced by a weight
(A) Of same magnitude as that of bar and applied at the lower end
(B) Half the weight of bar applied at lower end
(C) Half of the square of weight of bar applied at lower end
(D) One fourth of weight of bar applied at lower end

9. The lower layer of the beam as shown in the below figure, will be

(A) In tension
(B) In compression
(C) Neither in tension nor in compression
(D) None of these

10. The tensile strength of the welded joint for double fillet is (where s = Leg or size of the weld, l = Length of weld, and σt = Allowable tensile stress for weld metal)
(A) 0.5 s.lt
(B) s.lt
(C) √2 s.lt
(D) 2.s.lt

11. If a material expands freely due to heating it will develop
(A) Thermal stresses
(B) Tensile stress
(C) Bending
(D) No stress

12. When a body is subjected to biaxial stress i.e. direct stresses (σx) and (σy) in two mutually perpendicular planes accompanied by a simple shear stress (τxy), then maximum normal stress is
(A) x + σy)/2 + (1/2) × √[(σx - σy+ 4 τ²xy]
(B) x + σy)/2 - (1/2) × √[(σx - σy+ 4 τ²xy]
(C) x - σy)/2 + (1/2) × √[(σx + σy+ 4 τ²xy]
(D) x - σy)/2 - (1/2) × √[(σx + σy+ 4 τ²xy]

13. The stress at which extension of the material takes place more quickly as compared to the increase in load is called
(A) Elastic point of the material
(B) Plastic point of the material
(C) Breaking point of the material
(D) Yielding point of the material

14. A cantilever beam is one which is
(A) Fixed at both ends
(B) Fixed at one end and free at the other end
(C) Supported at its ends
(D) Supported on more than two supports

15. In a prismatic member made of two materials so joined that they deform equally under axial stress, the unit stresses in two materials are
(A) Equal
(B) Proportional to their respective moduli of elasticity
(C) Inversely proportional to their moduli of elasticity
(D) Average of the sum of moduli of elasticity

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