Strength of Materials

31. Longitudinal stress in a thin cylinder is

1. equal to the hoop stress
2. twice the hoop stress
3. half of the hoop stress
4. one-fourth of hoop stress
5. four times the hoop stress.

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32. Modulus of rigidity is defined as the ratio of

1. longitudinal stress and longitudinal strain
2. volumetric stress and volumetric strain
3. lateral stress and lateral strain
4. shear stress and shear strain
5. linear stress and lateral strain.

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33. Percentage reduction of area in performing tensile test on cast iron may be of the order of

1. 50%
2. 25%
3. 0%
4. 15%
5. 60%.

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34. Poisson's ratio is defined as the ratio of

1. longitudinal stress and longitudinal strain
2. longitudinal stress and lateral stress
3. lateral stress and longitudinal stress
4. lateral stress and lateral strain
5. none of the above.

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35. Proof resilience per material is known as

1. resilience
2. proof resilience
3. modulus of resilience
4. toughness
5. impact energy.

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36. Resilience of a material is considered when it is subjected to

1. frequent heat treatment
2. fatigue
3. creep
4. shock loading
5. resonant condition.

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37. Rivets are made of following type of material

1. tough
2. hard
3. resilient
4. ductile
5. malleable.

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38. Rupture stress is

1. breaking stress
2. maximum load/original cross-sectional area
3. load at breaking point/A
4. load at breaking point/neck area
5. maximum stress.

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39. Shear stress induced in a shaft subjected to tension will be

1. maximum at periphery and zero at center
2. maximum at center
3. uniform throughout
4. average value in center
5. none of the above.

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40. Strain is defined as the ratio of

1. change in volume to original volume
2. change in length to original length
3. change in cross-sectional area to original cross-sectional area
4. any one of the above
5. none of the above.

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