Mechanical, Strength of Material Online Practice Test - Set 18 - ObjectiveBooks

# Practice Test: Question Set - 18

1. When a body is subjected to two equal and opposite forces, acting tangentially across the resisting section, as a result of which the body tends to shear off across the section, the stress and strain induced is
(A) Tensile stress, tensile strain
(B) Compressive stress, compressive strain
(C) Shear stress, tensile strain
(D) Shear stress, shear strain

2. The given figure shows the Mohr's circle of stress for two unequal and like principal stresses (Ïƒx and Ïƒy) acting at a body across two mutually perpendicular planes. The tangential stress is given by
(A) OC
(B) OP
(C) OQ
(D) PQ

3. The strain energy stored in a hollow circular shaft of outer diameter (D) and inner diameter (d) subjected to shear stress is
(A) (Ï„²/2C) (D² - d²/D) × Volume of shaft
(B) (Ï„²/2C) (D² + d²/D) × Volume of shaft
(C) (Ï„²/4C) (D² - d²/D) × Volume of shaft
(D) (Ï„²/4C) (D² + d²/D) × Volume of shaft

4. The center to center distance, between two consecutive rivets in a row, is called
(A) Margin
(B) Pitch
(C) Back pitch
(D) Diagonal pitch

5. Two shafts 'A' and 'B' are made of same material. The shaft 'A' is of diameter D and shaft 'B' is of diameter D/2. The strength of shaft 'B' is _________ as that of shaft 'A'
(A) One-eighth
(B) One-fourth
(C) One-half
(D) Four times

6. According to Unwin's formula, the relation between diameter of rivet hole (d) and thickness of plate (t) is given by (where d and t are in mm)
(A) d = t
(B) d = 1.6 t
(C) d = 2t
(D) d = 6t

7. 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
(A) Mild steel
(B) Cast iron
(C) Glass
(D) Copper

8. A rectangular beam of length l supported at its two ends carries a central point load W. The maximum deflection occurs
(A) At the ends
(B) At l/3 from both ends
(C) At the center
(D) None of these

9. The ratio of the lateral strain to the linear strain is called
(A) Modulus of elasticity
(B) Modulus of rigidity
(C) Bulk modulus
(D) Poisson's ratio

10. The shear force of a cantilever beam of length l carrying a uniformly distributed load of w per unit length is _________ at the free end.
(A) Zero
(B) wl/4
(C) wl/2
(D) wl

11. In a simple bending of beams, the stress in the beam varies
(A) Linearly
(B) Parabolically
(C) Hyperbolically
(D) Elliptically

12. The shear force at a point on a beam is the algebraic __________ of all the forces on either side of the point.
(A) Sum
(B) Difference
(C) Multiplication
(D) Division

13. When a cantilever beam is loaded at its free end, the maximum compressive stress shall develop at
(A) Bottom fibre
(B) Top fibre
(C) Neutral axis
(D) Center of gravity

14. The total strain energy stored in a body is termed as
(A) Resilience
(B) Proof resilience
(C) Impact energy
(D) Modulus of resilience

15. When a body is subjected to biaxial stress i.e. direct stresses (Ïƒx) and (Ïƒy) in two mutually perpendicular planes accompanied by a simple shear stress (Ï„xy), then maximum shear stress is
(A) (1/2) × √[(Ïƒx - Ïƒy)² + 4 Ï„²xy]
(B) (1/2) × √[(Ïƒx + Ïƒy)² + 4 Ï„²xy]
(C) √[(Ïƒx - Ïƒy)² + Ï„²xy]
(D) √[(Ïƒx + Ïƒy)² + Ï„²xy]

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