Strength of Materials MCQ Practice Test - ObjectiveBooks

Practice Test: Question Set - 31

1. A closely coiled helical spring is of mean diameter (D) and spring wire diameter (d). The spring index is the ratio of
(A) 1/d
(B) 1/D
(C) D/d
(D) d/D

2. The compression test is carried on __________ materials.
(A) Ductile
(B) Brittle
(C) Malleable
(D) Plastic

3. If the tearing efficiency of a riveted joint is 50%, then ratio of rivet hole diameter to the pitch of rivets is
(A) 0.20
(B) 0.30
(C) 0.50
(D) 0.60

4. The breaking stress is __________ the ultimate stress.
(A) Equal to
(B) Less than
(C) Greater than
(D) None of these

5. The section modulus (Z) of a beam is given by
(A) I/y
(B) I.y
(C) y/I
(D) M/I

6. The Rankine's formula holds good for
(A) Short columns
(B) Long columns
(C) Both short and long columns
(D) Weak columns

7. When two main plates are kept in alignment butting each other and riveted with cover plate on both sides of the main plates with two rows of rivets in each main plate, the joint is known as ________ double cover butt joint.
(A) Single riveted
(B) Double riveted
(C) Multi riveted
(D) None of these

8. When a shaft is subjected to a twisting moment, every cross-section of the shaft will be under
(A) Tensile stress
(B) Compressive stress
(C) Shear stress
(D) Bending stress

9. The maximum bending moment of a simply supported beam of span l and carrying a point load W at the center of beam, is
(A) Wl/4
(B) Wl/2
(C) Wl
(D) Wl²/4

10. A tensile test is performed on a mild steel round bar. Its diameter after fracture will
(A) Remain same
(B) Increase
(C) Decrease

11. Transverse fillet welds are designed for
(A) Tensile strength
(B) Compressive strength
(C) Shear strength
(D) Bending strength

12. The product of the tangential force acting on the shaft and its distance from the axis of the shaft (i.e. radius of shaft) is known as
(A) Bending moment
(B) Twisting moment
(C) Torsional rigidity
(D) Flexural rigidity

13. The unit of strain is
(A) N-mm
(B) N/mm
(C) mm
(D) No unit

14. In spring balances, the spring is used
(A) To apply forces
(B) To measure forces
(C) To absorb shocks
(D) To store strain energy

15. A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum shear stress will be
(A) 400 MPa
(B) 500 MPa
(C) 900 MPa
(D) 1400 MPa

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