Theory of Structures

71. The point of contraflexure is the point where

1. B.M. changes sign
2. B.M. is maximum
3. B.M. is minimum
4. S.F. is zero

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72. The moment of inertia of a rectangular section of width 'B' and depth 'D' about an axis passing through C.G. and parallel to its width is

1. BD²/6
2. BD3/6
3. BD3/12
4. B²D/6

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73. The moment of inertia of a triangular section (height h, base b) about its base, is

1. bh²/12
2. b²h/12
3. bh³/12
4. b³h/12

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74. P = 4π² EI/L² is the equation of Euler's crippling load if

1. Both the ends are fixed
2. Both the ends are hinged
3. One end is fixed and other end is free
4. One end is fixed and other end is hinged

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75. P = π² El/L² is the equation for Euler's crippling load if

1. Both the ends are fixed
2. Both the ends are hinged
3. One end is fixed and other end is free
4. One end is fixed and other end is hinged

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76. P = π² El/4L² is the equation of Euler's crippling load, if

1. Both the ends are fixed
2. Both the ends are hinged
3. One end is fixed and other end is free
4. One end is fixed and other end is hinged

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77. The locus of the end point of the resultant of the normal and tangential components of the stress on an inclined plane, is

1. Circle
2. Parabola
3. Ellipse
4. Straight line

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78. Beams composed of more than one material, rigidly connected together so as to behave as one piece, are known as

1. Compound beams
2. Indeterminate beams
3. Determinate beams
4. Composite beams

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79. The forces acting normally on the cross section of a bar shown in the given figure introduce

1. Compr essive stress
2. Tensile stress
3. Shear stress
4. None of these

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80. Flat spiral springs

1. Consist of uniform thin strips
2. Are supported at outer end
3. Are wound by applying a torque
4. All the above

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