# Generalized Hooke’s Law MCQs – Soil Mechanics

Generalized Hooke’s Law
With how many elastic constants, the elastic body is said to be isotropic?
(A). same only in y-direction
(B). same only in the x-direction
(C). different in all direction
(D). same in all direction
(E). None of these

How much the independent elastic constant are?
(A). 2
(B). 5
(C). 0
(D). 6
(E). None of these

What is the constant C11, in the generalized Hook’s law equation, εX=C11σx+ C12 (σY+σZ)?
(A). E
(B). 1/E
(C). 0
(D). μ
(E). None of these

What is the modulus of elasticity in MPa for very soft clay?
(A). 2-15
(B). 15-60
(C). 50-81
(D). 100-200
(E). None of these

What is the constant C12, in the generalized Hook’s law equation, εX=C11σx+ C12 (σY+σZ)?
(A). E
(B). 1/E
(C). –μ/E
(D). μ
(E). None of these

What is the range of Poisson’s ratio μ for loess?
(A). 0.1-0.3
(B). 0.4-0.5
(C). 0.3-0.35
(D). 0.9-1
(E). None of these

How many do the elastic constants of the generalized Hooke’s law equation connecting the strain to stress contain?
(A). 40
(B). 36
(C). 39
(D). 38
(E). None of these

What does Hooke’s law state within the elastic limit?
(A). the stress is always directly proportional to its strain
(B). the stress is always inversely proportional to its strain
(C). the stress does not depend upon its strain
(D). the stress is equal to its strain
(E). None of these