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Assertion (A): Cold working of metals results in increase of strength and hardness.
Reason (R): Cold working reduce the total number of dislocations per unit volume of the material
Reason (R): Cold working reduce the total number of dislocations per unit volume of the material
[PI 2005]
- a)Both A and R are true and R is the correct explanation of A
- b)Both A and R are true but R is not a correct explanation of A
- c)A is true but R is false
- d)A is false but R is true
Correct answer is option 'C'. Can you explain this answer?
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Assertion (A): Cold working of metals results in increase of strength ...
Explanation:
- Cold working is a process of plastic deformation of metals at room temperature or below their recrystallization temperature.
- During cold working, the metal is subjected to external forces, which cause the movement of dislocations within the metal crystal structure.
- This movement of dislocations causes the crystal structure to distort and align in a specific direction, leading to an increase in the number of dislocations per unit volume of the material.
- The increase in the number of dislocations results in an increase in the strength and hardness of the metal.
- Therefore, Assertion (A) is true.
- However, Reason (R) is false because cold working does not reduce the total number of dislocations per unit volume of the material, but rather increases it.
- Hence, the correct option is (C) A is true but R is false.
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Assertion (A): Cold working of metals results in increase of strength and hardness.Reason (R): Cold working reduce the total number of dislocations per unit volume of the material[PI 2005]a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is not a correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer?
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ample number of questions to practice Assertion (A): Cold working of metals results in increase of strength and hardness.Reason (R): Cold working reduce the total number of dislocations per unit volume of the material[PI 2005]a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is not a correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
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