Strength of Materials

61. Along the principal plan subjected to maximum principal stress

1. Maximum shear stress acts
2. Minimum shear stress acts
3. No shear stress acts
4. None of these

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62. An arch may be subjected to

1. Shear and axial force
2. Bending moment and shear force
3. Bending moment and axial force
4. Thrust, shear force and bending moment

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63. An arch with three hinges, is a structure

1. Statically determinate
2. Statically indeterminate
3. Geometrically unstable
4. Structurally sound but indeterminate

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64. An open-ended cylinder of radius 'r' and thickness 't' is subjected to internal pressure 'p'. The Young's modulus for the material is 'E' and Poisson's ratio is 'μ'. The longitudinal strain is

1. Zero
2. pr/TE
3. pr/2TE
4. None of these

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65. Angle of friction is the

1. Angle between normal reaction and the resultant of normal reaction and the limiting friction
2. Ratio of limiting friction and normal reaction
3. The ratio of minimum friction force to the friction force acting when the body is just about to move
4. The ratio of minimum friction force to friction force acting when the body is in motion

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66. As compared to uniaxial tension or compression, the strain energy stored in bending is only

1. 43678
2. 43556
3. 43525
4. 43497

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67. As the elastic limit reaches, tensile strain

1. Increases more rapidly
2. Decreases more rapidly
3. Increases in proportion to the stress
4. Decreases in proportion to the stress

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68. At either end of a plane frame, maximum number of possible bending moments, are

1. Zero
2. One
3. Two
4. Three

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69. At either end of a plane frame, maximum number of possible transverse shear forces, are

1. One
2. Two
3. Three
4. Four

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70. Beams of uniform strength are preferred to those of uniform section because these are economical for

1. Large spans
2. Heavy weights
3. Light weights
4. Short spans

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