As the grain size of a metal increases, its strength ________

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RRB Paper · Accepted Answer

The strength of a metal is directly proportional to its ability to resist plastic deformation, thus resisting its dislocation movement. More the number of grain boundaries (fine is the grain size), more is the more obstruction to the movement of dislocation, thus more is the strength of a metal. So as the grain size of a metal increases, its strength decreases.

As the grain size of a metal increases, its strength ________

Decreases

Increases

Remains constant

No effect of grain size on strength

The correct answer is `No. 1: Decreases`

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As the grain size of a metal increases, its strength ________

Decreases

Increases

Remains constant

No effect of grain size on strength

The correct answer is No. 1: Decreases

The correct answer is `No. 1: Decreases`