According to the Robert Hooke rule, when an object is exerted in the elastic limit, the stress and deformation produced in that object are proportional to deformation. Hook's rule applies in the case of both stretching tension and pressing compression. In other words, the limit of elasticity, that is, when an object is bent before it breaks, then it will create a stress that wants to straighten it, it is proportional to the deformation i.e. change in shape. Hooke's law is only a first-order linear approximation to the real response of springs and other elastic bodies to applied forces. It must eventually fail once the forces exceed some limit, since no material can be compressed beyond a certain minimum size, or stretched beyond a maximum size, without some permanent deformation or change of state. Let's get well knowledge about Hooke's law in Mechanical Engineering.
1. In which year was the method of elasticity discovered by the English scientist Robert Hooke?
A. In 1660
B. In 1662
C. In 1665
D. In 1667
2. Hooke's law states that...
A. F_{s}=Kx
B. x=F_{s}/K
C. Both of the above
D. None of these
3. In which year did Hooke give a rule for the relation between Stress and Strain?
A. In 1660
B. In 1675
C. In 1676
D. In 1679
4. Which is the factor of safety?
A. The ratio of ultimate stress to the permissible stress
B. The ratio of stress to strain
C. The raio of permissible stress to the ultimate stress
D. All of the above
5. Which of the following is Hooke’s law for the 1-D system?
A. The relation between normal stress and the corresponding strain
B. The relation between lateral strain and the corresponding stress
C. The relation between shear stress and the corresponding strain
D. All of the above
6. Limit of proportionality depends upon ------------------.
A. Type of material
B. Area of cross-section
C. Both of the above
D. None of these
7. Which of the following is Hookes material?
A. Steel
B. Aluminium
C. Copper
D. All of the above
8. In which place the stress-strain curve, Hooke's law is valid?
A. Strain hardening region
B. Necking region
C. Elastic range
D. All of the above
9. Which of the following is the SI unit of Hooke's law?
A. kg/s2
B. N/m
C. Both of the above
D. None of these
10. For an isotropic, homogeneous and elastic material obeying Hooke’s law, the number of independent elastic constants is----------------.
A. Two
B. Three
C. Nine
D. Ten
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