The modulus of elasticity of steel is greater than that of rubber because under the same stress
  • the strain in steel is less than rubber
  • the strain in steel is more than rubber
  • elongation in steel is more than in rubber
  • none of the above
Which of the following represents Hooke's Law?
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  • A
  • B
  • C
  • D
A body is said to be perfectly plastic if
  • it does not recover its original shape / size when the deforming force is removed
  • it has the property of stretching indefinitely
  • it expands without breaking, on subjection of large strain
  • it is not effected by external force
A body is said to be perfectly elastic if
  • it can move freely
  • it is not effected by external force
  • it recovers its original shape / size when the deforming force is removed
  • its surface is perfectly smooth
Which diagram verifies Hooke's law? A. B. C. D.
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  • A
  • B
  • C
  • D
Materials that show very small plastic range beyond elastic limit are called
  • Brittle materials
  • Elastomers
  • Elastic materials
  • Ductile materials
The stress which is set up in the body due to increase in its dimensions is called
  • volumetric stress
  • Tangential stress
  • Normal stress
  • Tensile stress
If proportional limit is not exceeded, energy per unit volume in stretched wire is
  • 1/2 x stress x strain
  • stress x strain
  • stress x strain 2
  • 1/2 stress x strain 2
Putty or mud is an example of
  • semi elastic
  • plastic material
  • elastomers
  • elastic material
A solid cylinder can be subjected to
  • tensile stress
  • compressive stress
  • shearing stress
  • all the above
When a 13.2 kg mass is placed on top of a vertical spring, the spring compresses by 5.93 cm. Find the force constant of the spring.
  • 2281 N/m
  • 3181 N/m
  • 2175 N/m
  • 3085 N/m
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.
  • 1 : 2
  • 4 : 1
  • 2 : 1
  • 1 : 4
Yield point may be defined as the point where
  • working stress ends and breaking stress begins
  • breaking stress ends and working stress begins
  • elastic behavior ends and plastic behavior begins
  • plastic behavior ends and elastic behavior begins
Dimensional formula of stress is same as that of
  • pressure
  • impulse
  • strain
  • force
In Hooke's law, the constant of proportionality signifies
  • modulus of elasticity
  • modulus of strain
  • elasticity of wire
  • modulus of stress
After prolonged use, springs deform permanently because of
  • its rigidity
  • elastic fatigue
  • elastic after effect
  • plastic fatigue
The area occupied below the stress-strain graph and above strain axis gives the value of
  • work done in producing extension
  • energy stored in the material
  • Restoring force.
  • energy density of the material
The final point on the stress strain graph is called
  • Fracture point
  • Yield point
  • Elastic limit
  • Proportional limit
Tissue of aorta blood vessel is an example of
  • state of permanant deformation
  • perfectly plastic body
  • perfectly elastic body
  • elastomer
If we compress or elongate the solids, what happens to their potential energy?
  • P.E. of solid decreases whether it is compressed or elongated
  • P.E. of solid increases if it is elongated
  • P.E. of solid increases whether it is compressed or elongated
  • P.E. of solid increases if it is compressed
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