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What is the effect of hammering on elasticity of materials?

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What is the effect of hammering on elasticity of materials?

(a) Has no effect on elasticity

(b) Decreases the elasticity

(c) Increases the elasticity

(d) Breaks the material

This question was posed to me in an online quiz.

I want to ask this question from Elasticity topic in division Thermal Properties of Matter of Engineering Physics I

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Right choice is (c) Increases the elasticity

For explanation: While being hammered or rolled, crystals break into smaller units resulting in increase of their elastic properties.

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