Following are some of the multiple choice questions on the **Strength of Materials** with answers that will help the students in developing their knowledge.

## Strength of Materials MCQ

### 1. The algebraic sum of moments of the forces forming couple about any point in their plane is

### 2. A composite shaft consisting of two stepped portions having spring constants k1 and k2 is held between two rigid supports at the ends. Its equivalent spring constant is

### 3. If a number of forces act simultaneously on a particle, it is possible

### 4. The object of caulking in a riveted joint is to make the joint

### 5. Limiting force of friction is the

### 6. A pair of smith’s tongs is an example of the lever of

### 7. Two coplanar couples having equal and opposite moments

### 8. In determining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than

### 9. The neutral axis of the cross-section a beam is that axis at which the bending stress is

### 10. 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.

### 11. Whenever a material is loaded within elastic limit, stress is __________ strain.

### 12. 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.

### 13. The strain energy stored in a solid circular shaft subjected to shear stress (τ) is (where C = Modulus of rigidity for the shaft material)

### 14. The stress at which the extension of the material takes place more quickly as compared to the increase in load, is called

### 15. A beam supported at its both ends is not a simply supported beam.

### 16. In a simple bending of beams, the stress in the beam varies

### 17. The rectangular beam 'A' has length l, width b and depth d. Another beam 'B' has the same length and depth but width is double that of 'A'. The elastic strength of beam 'B' will be __________ as compared to beam A.

### 18. If the tearing efficiency of a riveted joint is 50%, then ratio of rivet hole diameter to the pitch of rivets is

### 19. A concentrated load is one which

### 21. If the depth is kept constant for a beam of uniform strength, then its width will vary in proportional to (where M = Bending moment)

### 22. In order to know whether a column is long or short, we must know its slenderness ratio.

### 23. The limit of eccentricity is based upon no tension condition.

### 24. When a bar is cooled to - 5°C, it will develop

### 25. When shear force at a point is zero, then bending moment is __________ at that point.

### 26. The bending stress in a beam is __________ section modulus.

### 27. In compression test, the fracture in cast iron specimen would occur along

### 28. The energy stored in a body when strained within elastic limit is known as

### 29. The maximum stress produced in a bar of tapering section is at

### 30. The simply supported beam 'A' of length l carries a central point load W. Another beam 'B' is loaded with a uniformly distributed load such that the total load on the beam is W. The ratio of maximum deflections between beams A and B is

### 31. The point of contraflexure is a point where

### 32. When a rectangular beam is loaded transversely, the maximum compressive stress is developed on the

### 33. The torque transmitted by a solid shaft of diameter (D) is (where τ = Maximum allowable shear stress)

### 34. Strain rosettes are used to

### 35. A thin cylindrical shell of diameter (d) and thickness (t) is subjected to an internal pressure (p). The ratio of longitudinal strain to volumetric strain is

### 36. Two closely coiled helical springs 'A' and 'B' are equal in all respects but the number of turns of spring 'A' is half that of spring 'B' The ratio of deflections in spring 'A' to spring 'B' is

### 37. The maximum diameter of the hole that can be punched from a plate of maximum shear stress 1/4th of its maximum crushing stress of punch, is equal to (where t = Thickness of the plate)

### 38. The bending moment at a point on a beam is the algebraic __________ of all the moments on either side of the point.

### 39. When a body is subjected to two equal and opposite pushes, as a result of which the body tends to reduce its length, the stress and strain induced is compressive.

### 40. In order to prevent crushing of masonry at the base of the dam, the maximum stress should be __________ the permissible stress of the soil.

### 41. A masonry dam may fail due to

### 42. If the slenderness ratio for a column is 100, then it is said to be a __________ column.

### 43. A thick cylindrical shell having ro and ri as outer and inner radii, is subjected to an internal pressure (p). The maximum tangential stress at the inner surface of the shell is

### 44. The stress induced in a body, when suddenly loaded, is __________ the stress induced when the same load is applied gradually.

### 45. A steel bar of 5 mm is heated from 15° C to 40° C and it is free to expand. The bar Will induce

### 46. 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 normal stress will be

### 47. Euler's formula holds good only for

### 49. A vertical column has two moments of inertia (i.e. Ixx and Iyy ). The column will tend to buckle in the direction of the

### 50. A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal

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