Strength of Materials

1. A beam is loaded as cantilever. If the load at the end is increased, the failure will occur

1. in the middle
2. at the tip below the load
3. at the support
4. anywhere
5. none of the above.

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2. A boiler shell 200 cm diameter and plate thickness 1.5 cm is subjected to internal pressure of 1.5 MN/m , then the hoop stress will be

1. 30 MN/m2
2. 50 MN/m2
3. 100 MN/m2
4. 200 MN/m2
5. 300 MN/m2.

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3. A cylindrical section having no joint is known as

1. jointless section
2. homogeneous section
3. perfect section
4. manufactured section
5. seamless section.

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4. A key is subjected to side pressure as well at shearing forces. These pressures are called

1. bearing stresses
2. fatigue stresses
3. crushing stresses
4. resultant stresses
5. none of the above.

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5. A material capable of absorbing large amount of energy before fracture is known as

1. ductility
2. toughness
3. resilience
4. shock proof
5. plasticity.

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6. A non-yielding support implies that the

1. support is frictionless
2. support can take any amount of reaction
3. support holds member firmly
4. slope of the beam at the support is zero
5. none of the above.

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7. A riveted joint in which every rivet of a row is opposite to other rivet of the outer row, is known as

1. chain riveted joint
2. diamond riveted joint
3. criss-cross riveted joint
4. zig-zag riveted joint
5. none of the above.

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8. A riveted joint in which the number otrivets decrease from innermost to outer most row is called

1. chain riveted joint
2. diamond riveted joint
3. criss-cross riveted joint
4. zig-zag riveted joint
5. none of the above.

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9. A thin mild steel wire is loaded by adding loads in equal increments till it breaks. The extensions noted with increasing loads will behave as under

1. uniform throughout
2. increase uniformly
3. first increase and then decrease
4. increase uniformly first and then increase rapidly
5. increase rapidly first and then uniformly.

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10. Coaxing is the method of increasing

1. strength by reversible cycling
2. corrosion resistance by spraying
3. hardness by surface treatment
4. fatigue resistance by over-stressing the metal by successively increasing loadings
5. creep by head treatment.

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