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Class 11 Physics
Mechanical Properties Of Solids Chapter 9
Quiz 1
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The modulus of elasticity of steel is greater than that of rubber because under the same stress
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the strain in steel is less than rubber
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the strain in steel is more than rubber
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elongation in steel is more than in rubber
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none of the above
Which of the following represents Hooke's Law?
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A
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B
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C
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D
A body is said to be perfectly plastic if
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it does not recover its original shape / size when the deforming force is removed
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it has the property of stretching indefinitely
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it expands without breaking, on subjection of large strain
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it is not effected by external force
A body is said to be perfectly elastic if
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it can move freely
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it is not effected by external force
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it recovers its original shape / size when the deforming force is removed
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its surface is perfectly smooth
Which diagram verifies Hooke's law? A. B. C. D.
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A
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B
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C
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D
Materials that show very small plastic range beyond elastic limit are called
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Brittle materials
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Elastomers
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Elastic materials
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Ductile materials
The stress which is set up in the body due to increase in its dimensions is called
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volumetric stress
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Tangential stress
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Normal stress
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Tensile stress
If proportional limit is not exceeded, energy per unit volume in stretched wire is
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1/2 x stress x strain
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stress x strain
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stress x strain 2
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1/2 stress x strain 2
Putty or mud is an example of
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semi elastic
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plastic material
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elastomers
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elastic material
A solid cylinder can be subjected to
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tensile stress
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compressive stress
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shearing stress
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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.
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2281 N/m
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3181 N/m
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2175 N/m
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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.
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1 : 2
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4 : 1
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2 : 1
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1 : 4
Yield point may be defined as the point where
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working stress ends and breaking stress begins
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breaking stress ends and working stress begins
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elastic behavior ends and plastic behavior begins
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plastic behavior ends and elastic behavior begins
Dimensional formula of stress is same as that of
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pressure
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impulse
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strain
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force
In Hooke's law, the constant of proportionality signifies
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modulus of elasticity
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modulus of strain
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elasticity of wire
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modulus of stress
After prolonged use, springs deform permanently because of
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its rigidity
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elastic fatigue
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elastic after effect
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plastic fatigue
The area occupied below the stress-strain graph and above strain axis gives the value of
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work done in producing extension
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energy stored in the material
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Restoring force.
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energy density of the material
The final point on the stress strain graph is called
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Fracture point
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Yield point
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Elastic limit
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Proportional limit
Tissue of aorta blood vessel is an example of
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state of permanant deformation
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perfectly plastic body
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perfectly elastic body
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elastomer
If we compress or elongate the solids, what happens to their potential energy?
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P.E. of solid decreases whether it is compressed or elongated
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P.E. of solid increases if it is elongated
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P.E. of solid increases whether it is compressed or elongated
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P.E. of solid increases if it is compressed
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