Strength of Materials

41. Tensile strength of a material is obtained by dividing the maximum load during the test by the

1. area at the time of fracture
2. original cross-sectional area
3. average of (a) and (b)
4. minimum area after fracture
5. none of the above.

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42. The buckling load for a given material depends on

1. slenderness ratio and area of cross-section
2. Poisson's ratio and modulus of elasticity
3. slenderness ratio and modulus of elasticity
4. slenderness ratio, area of cross-section and modulus of elasticity
5. Poisson's ratio and slenderness ratio.

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43. The change in the unit volume of a material under tension with increase in its Poisson's ratio will ,

1. increase
2. decrease
3. remain same
4. increase initially and then decrease
5. unpredictable.

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44. The deformation of a bar under its own weight compared to the deformation of same body subjected to a direct load equal to weight of the body is

1. same
2. double
3. half
4. four times
5. one-fourth.

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45. The distance between the centres of the rivets in adjacent rows of zig-zag riveted joint is known as

1. pitch
2. back pitch
3. diagonal pitch
4. diametral pitch
5. lap.

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46. The elasticity of various materials is controlled by its

1. ultimate tensile stress
2. proof stress
3. stress at yield point
4. stress at elastic limit
5. tensile stress.

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47. The energy absorbed in a body, when it is strained within the elastic limits, is known as

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

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48. The force acting along the circumference will cause stress in the walls in a direction normal to the longitudinal axis of cylinder; this stress is called

1. longitudinal stress
2. hoop stress
3. yeiled stress
4. ultimate stress
5. none of the above.

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49. The impact strength of a material is an index of its

1. toughness
2. tensile strength
3. capability of being cold worked
4. hardness
5. fatigue strength.

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50. The intensity of stress which causes unit strain is called

1. unit stress
2. bulk modulus
3. modulus of rigidity
4. modulus of elasticity
5. principal stress.

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