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Q.

Identify the incorrect statement

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a

The stretching of coil is determined by its Young’s modulus

b

The Young’s modulus of rubber is lower than that of steel

c

The Young’s and shear modulus are defined only for solids       

d

Bulk modulus is relavent for solids, liquids and gases

answer is D.

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Detailed Solution

Only solid and rigid body has shear and Young's modulus.Any substance having a volume has bulk modulus, steel is more elastic than rubber. Stretching force in a spring is not acting perpendicular to the cross section of the wire rather it acts tangential to the surface of the spring. Hence shear modulus has to be considered for stretching of a spring.

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