Civil Mechanic Online Test Strength of Materials - Set 06 - ObjectiveBooks

Civil Mechanic Online Test Strength of Materials - Set 06

Practice Test: Question Set - 06

1. The coefficient of friction depends on
    (A) Area of contact
    (B) Shape of surfaces
    (C) Strength of surfaces
    (D) Nature of surface

2. A closely coiled helical spring of radius R, contains n turns and is subjected to an axial loadW. If the radius of the coil wire is r and modulus of rigidity of the coil material is C, the stress developed in the helical spring is
    (A) WR/πr3
    (B) 2WR/πr3
    (C) 2WR/πr2
    (D) 4WR/πr2

3. The intensity of direct longitudinal stress in the cross-section at any point distant r from the neutral axis, is proportional to
    (A) r
    (B) 1/r
    (C) r2
    (D) 1/r2

4. The coefficient of friction depends upon
    (A) Nature of surfaces
    (B) Area of contact
    (C) Shape of the surfaces
    (D) All of the above

5. The force in member U2L2 of the truss shown in below figure, is
Question No. 05
    (A) 10 T tension
    (B) 10 T compression
    (C) Zero
    (D) 15 T compression

6. The ratio of the moments of resistance of a solid circular shaft of diameter D and a hollow shaft (external diameter D and internal diameter d), is
    (A) D4/(D4 - d4)
    (B) D3/(D3 - d3)
    (C) (D4 - d4)/D4
    (D) (D3 - d3)/D3

7. The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of
    (A) Friction
    (B) Limiting friction
    (C) Repose
    (D) Kinematic friction

8. When loads are applied proportionately to a frame structure containing its members in one plane, the structure is called
    (A) Grid frame
    (B) Plane frame
    (C) Space frame
    (D) Truss frame

9. The maximum stress intensity due to a suddenly applied load is x-times the stress intensity produced by the load of the same magnitude applied gradually. The value of x is
    (A) 1
    (B) 2
    (C) 3
    (D) 1/2

10. The unit of power in S.I. units is
    (A) Newton meter
    (B) Watt
    (C) Joule
    (D) Kilogram meter/sec

11. The maximum bending moment due to a moving load on a simply supported beam, occurs
    (A) At the mid span
    (B) At the supports
    (C) Under the load
    (D) Anywhere on the beam

12. Which of the following is not the unit of pressure?
    (A) kg/cm
    (B) atm
    (C) kg/cm2
    (D) Newton

13. What is the answer to this question?
Question No. 13
    (A) 500 kg compressive
    (B) 500 kg tensile
    (C) 1500 kg tensile
    (D) 1500 kg compressive

14. The maximum resistance against rotation, is offered by the weld at a point
    (A) Most distant
    (B) Least distant
    (C) At either end
    (D) Centrally located

15. During a tensile test on a ductile material
    (A) Nominal stress at fracture is higher than the ultimate stress
    (B) True stress at fracture is higher than the ultimate stress
    (C) True stress at fracture is the same as the ultimate stress
    (D) None of these

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