Beta Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise (Conceptual Questions)>Q 18

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The mean distance between the atoms of iron is $3 \times 10^{- 10} m$ and the interatomic force constant for iron is $7 N m^{- 1}$ . Young’s modulus of elasticity for iron is

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Important Questions on Elasticity

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Beta Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise (Conceptual Questions)>Q 19

The cross-section area of a steel wire

(Y = 2.0 \times 10^{11} N m^{- 2})

is

0.1 {cm}^{2}

. The required force to make its length double will be,

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Beta Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise (Conceptual Questions)>Q 20

The diameter of a brass rod is

4 mm

and Young’s modulus of brass is

9 \times 10^{10} N m^{- 2}

. The force required to stretch it by

0.1 %

of its length is:

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Beta Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise (Conceptual Questions)>Q 21

Poisson’s ratio can not have the value

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Beta Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise (Conceptual Questions)>Q 22

Two wires of the same length and material but different radii

r_{1} and r_{2}

are suspended from a rigid support both carry the same load at the lower end. The ratio of the stress developed in the second wire to that developed in the first wire is___

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Beta Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise (Conceptual Questions)>Q 23

An increase in pressure required to decrease the

200 L

volume of a liquid by

0.004 %

in a container is: (Bulk modulus of the liquid

= 2100 MPa

)

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Beta Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise (Conceptual Questions)>Q 24

If

S

is stress and

Y

is Young’s modulus of the material of a wire, the energy stored in the wire per unit volume is

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Beta Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise (Conceptual Questions)>Q 25

For constant hydraulic stress on an object, the fractional change in the object’s volume

(\frac{∆ V}{V})

and its bulk modulus

(B)

are related as

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Beta Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise (Conceptual Questions)>Q 26

A wire of length

L

and cross-sectional area

A

is made of a material of Young’s modulus,

Y

. The work done in stretching the wire by an amount

X

is given by