MEDIUM
11th West Bengal Board
IMPORTANT
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Define Poisson's ratio. Is it an elastic modulus ?

Important Questions on Elasticity

HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 12 - Elasticity>EXERCISE>Q 6
Write down the relations between the different modulii of elasticity. From these relations obtain the limiting values of the Poissons ratio.
HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 12 - Elasticity>EXERCISE>Q 7
Find the relation between the volume strain and longitudinal strain of an elastic material. In which material there may not be any volume strain, even though it has longitudinal strain?
HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 12 - Elasticity>EXERCISE>Q 8
Explain why gases do not have unique value of bulk modulus. Define two well-defined bulk moduli of elasticity of gases, which are generally useful. Find their relation with the pressure of the gas.
HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 12 - Elasticity>EXERCISE>Q 9
What are isothermal and adiabatic bulk modulii of gas? Find their values. Explain how Young's modulus of a material in the form of a wire may be determined in the laboratory.
HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 12 - Elasticity>EXERCISE>Q 10
Find the work done by an external agent when a wire is stretched by a tensile force. Where this energy is stored ? What happens to this energy when the stretching force is withdrawn ?
HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 12 - Elasticity>EXERCISE>Q 11
Find the energy stored in a stretched elastic chord. Find the elastic energy per unit volume of the stretched wire. Prove that elastic potential energy density u=YAl22L, where the different symbols have usual meanings.
HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 12 - Elasticity>EXERCISE>Q 12
Prove that elastic potential density =12× stress × strain.
HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 12 - Elasticity>EXERCISE>Q 13
Draw the stress-strain graph for an elastic material and explain the different parts of the curve. With reference to the curve explain the following : proportional limit, perfect elasticity, elastic limit, yield point, breaking stress, plastic deformation and breaking load. Which materials are called ductile and brittle ?