Multiple Choice 1 and Answers on Mechanical Properties of Solids...

1. A perfectly rigid body is one
A. which does not move on application of force
B. whose shape and size change on application of force
C. whose shape and size do not change on application of force
D. which flows on application of force

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2. In Fig 1.1, the elastic zone is
A. OT
B. OU
C. OW
D. OX

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Fig 1.1

3. In Fig 1.2, T is
A. the limit of proportionality
B. yield strength
C. ultimate strength
D. fracture point

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Fig 1.2

4. In Fig 1.3, permanent deformation occurs if the stres is increased beyond
A. T
B. U
C. W
D. X

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Fig 1.3

5. In Fig 1.3, which of the following is NOT true in the region OT
A. extension is not proportional to the applied force
B. material is not elastic
C. material is elastic
D. the slope gives the Young's modulus

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Fig 1.4

6. In Fig 1.5, the yield point is
A. T
B. U
C. W
D. X

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Fig 1.5

7. In Fig 1.5, the tensile stress corresponds to stress at point
A. T
B. U
C. W
D. X

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Fig 1.6

8. Young’s modulus Y is the ratio of
A. tensile (or compressive) stress to the longitudinal strain
B. shear stress to the longitudinal strain
C. longitudinal strain to the tensile (or compressive) stress
D. shear strain to the longitudinal stress

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9. Shear modulus or modulus of rigidity is the ratio of
A. shearing stress to shearing strain
B. shearing stress to lateral strain
C. shearing strain to shearing stress
D. longitudinal stress to shearing strain

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10. Bulk modulus is the ratio of
A. the ratio of longitudinal stress to hydraulic strain
B. the ratio of hydraulic stress to hydraulic strain
C. the ratio of hydraulic strain to hydraulic stress
D. the ratio of lateral stress to hydraulic strain

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11. Under normal conditions columns which support buildings experience
A. shear stress
B. compressive stress
C. hydraulic stress
D. tensile stress

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12. Under normal conditions cantilevers outside buildings experience
A. shear stress
B. compressive stress
C. hydraulic stress
D. tensile stress

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13. Bolts securing beams to columns in steel buildings experience
A. shear stress
B. compressive stress
C. hydraulic stress
D. tensile stress

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14. Cross-section of steel beams are usually shaped like an I or H rather than a rectangle because
A. the strength to weight ratio of the beam is increased
B. the strength to weight ratio of the beam is decreased
C. stresses are not uniform in a rectangular sections
D. they have convient wings for attaching bolts

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15. A ductile material
A. has a large plastic deformation region
B. fractures at low stress
C. breaks soon after the yield point is reached
D. has a large elastic region

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16. A brittle material
A. has a large plastic deformation region
B. fractures at low stress
C. breaks soon after the yield point is reached
D. has a large elastic region

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17. If a material is subjected to two incremental true strains namely ε1 and ε2, then the total true strain is
A. ε1 X ε2
B. ε1 - ε2
C. ε1 + ε2
D. ε1 / ε2

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18. High elastic modulus in materials arises from
A. strong bonds
B. weak bonds
C. does not depend on bonds
D. averaage bonds

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19. Materials that show very small plastic range beyond elastic limit are called
A. brittle materials
B. elastomers
C. elastic materials
D. ductile materials

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20. The stress which causes a body to increase its dimensions is
A. sheer
B. hydraulic
C. compressive
D. tensile

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21. Steel has a greater modulus of elasticity that rubber because under the same stress
A. the strain in steel is less than rubber
B. the strain in steel is more than rubber
C. elongation in steel is more than in rubber
D. none of the above

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22. A solid metal cylinder can be subjected to
A. compressive stress
B. tensile stress
C. shearing stress
D. all the above

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23. Yield point may be defined as the point where
A. working stress ends and breaking stress begins
B. breaking stress ends and working stress begins
C. elastic behavior ends and plastic behavior begins
D. plastic behavior ends and elastic behavior begins

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24. Dimensional formula of stress is same as that of
A. pressure
B. impulse
C. strain
D. force

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25. The final point on the stress strain graph is called
A. fracture point
B. yield point
C. elastic limit
D. proportional limit

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26. If we compress or elongate the solids, their potential energy?
A. decrease whether compressed or elongated
B. increase if elongated
C. increase whether compressed or elongated
D. increase if compressed

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27. Springs deform permanently after prolonged use, because of
A. rigidity
B. elastic fatigue
C. plastic fatigue
D. Hooke's Law

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28. The modulus of elasticity ________________ temperature increase.
A. decreases with
B. increases with
C. does not depend on
D. may increase or decrease with

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29. The constant of proportionality in Hooke’s law is
A. modulus of elasticity
B. strain
C. restoring force
D. stress

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30. Find the ratio of stress produced in two wires of same length and material but with radii in the ratio 2 : 1 when both are under same force.
A. 1 : 2
B. 2 : 1
C. 4 : 1
D. 1 : 4