Strength of Materials

11. Deformation per unit length in the direction of force is known as

1. strain
2. lateral strain
3. linear strain
4. linear stress
5. unit strain.

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12. Diamond riveted joint can be adopted in the case of following type of joint

1. butt joint
2. lap joint
3. double riveted lap joints
4. all types of joints
5. none of the above.

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13. During a tensile test on a specimen of 1 cm cross-section, maximum load observed was 8 tonnes and area of cross-section at neck was 0.5 cm2. Ultimate tensile strength of specimen is

1. 4 tonnes/cm2
2. 8 tonnes/cm2
3. 16 tonnes/cm2
4. 22 tonnes/cm2
5. none of the above.

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14. Efficiency of a riveted joint is the ratio of its strength (max. load it can resist without failure) to the strength of the unpunched plate in

1. tension
2. compression
3. bearing
4. any one of the above
5. none of the above.

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15. Flow stress corresponds to

1. fluids in motion
2. breaking point
3. plastic deformation of solids
4. rupture stress
5. none of the above.

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16. For steel, the ultimate strength in shear as compared to in tension is nearly

1. same
2. half
3. one-third
4. two-third
5. one-fourth.

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17. For which material the Poisson's ratio is more than unity

1. steel
2. copper
3. aluminium
4. cast iron
5. none of the above.

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18. Hooke's law holds good up to

1. yield point
2. limit of proportionality
3. breaking point
4. elastic limit
5. plastic limit.

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19. If a material expands freely due to heating it will develop

1. thermal stresses
2. tensile stress
3. bending
4. compressive stress
5. no stress.

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20. If a part is constrained to move and heated, it will develop

1. principal stress
2. tensile stress
3. compressive stress
4. shear stress
5. no stress.

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