Beta Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise (Conceptual Questions)>Q 15

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How much force is required to produce an increase of $0.2 %$ in the length of a brass wire of diameter $0.6 mm$ ?
[Young’s modulus for brass $= 0.9 \times 10^{11} N m^{- 2}$ ]

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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 16

If the interatomic spacing in a steel wire is

2.8 \times 10^{- 10} m

and

Y_{steel} = 2 \times 10^{11} N m^{- 2}

, then force constant in

N m^{- 1}

is,

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Beta Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise (Conceptual Questions)>Q 17

The load versus elongation graph for four wires of the same material and same length is shown in the figure. The thinnest wire is represented by the line,

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

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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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

)