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1. Which of the following represents Hooke's Law?
A. A
B. B
C. C
D. D
2. A body is said to be perfectly plastic if
A. it does not recover its original shape / size when the deforming force is removed
B. it has the property of stretching indefinitely
C. it expands without breaking, on subjection of large strain
D. it is not effected by external force
3. A body is said to be perfectly elastic if
A. it can move freely
B. it is not effected by external force
C. it recovers its original shape / size when the deforming force is removed
D. its surface is perfectly smooth
5. Materials that show very small plastic range beyond elastic limit are called
A. Brittle materials
B. Elastomers
C. Elastic materials
D. Ductile materials
6. The stress which is set up in the body due to increase in its dimensions is called
A. volumetric stress
B. Tangential stress
C. Normal stress
D. Tensile stress
7. The modulus of elasticity of steel is greater than that of 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
8. If proportional limit is not exceeded, energy per unit volume in stretched wire is
A. 1/2 x stress x strain
B. stress x strain
C. stress x strain 2
D. 1/2 stress x strain 2
9. Putty or mud is an example of
A. semi elastic
B. plastic material
C. elastomers
D. elastic material
10. A solid cylinder can be subjected to
A. tensile stress
B. compressive stress
C. shearing stress
D. all the above
12. Two wires P and Q of same length and material but radii in the ratio 2 : 1 are suspended from a rigid support. Find the ratio of strain produced in the wires when both are under same force.
A. 1 : 2
B. 4 : 1
C. 2 : 1
D. 1 : 4
13. 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
14. Dimensional formula of stress is same as that of
A. pressure
B. impulse
C. strain
D. force
15. In Hooke's law, the constant of proportionality signifies
A. modulus of elasticity
B. modulus of strain
C. elasticity of wire
D. modulus of stress
16. After prolonged use, springs deform permanently because of
A. its rigidity
B. elastic fatigue
C. elastic after effect
D. plastic fatigue
17. The area occupied below the stress-strain graph and above strain axis gives the value of
A. work done in producing extension
B. energy stored in the material
C. Restoring force.
D. energy density of the material
18. The final point on the stress strain graph is called
A. Fracture point
B. Yield point
C. Elastic limit
D. Proportional limit
19. Tissue of aorta blood vessel is an example of
A. state of permanant deformation
B. perfectly plastic body
C. perfectly elastic body
D. elastomer
20. If we compress or elongate the solids, what happens to their potential energy?
A. P.E. of solid decreases whether it is compressed or elongated
B. P.E. of solid increases if it is elongated
C. P.E. of solid increases whether it is compressed or elongated
D. P.E. of solid increases if it is compressed
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