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The fluidity of molten metal of cast alloys (without any addition of fluxes) increases with increase in

1. viscosity
2. surface tension
3. freezing range
4. degree of superheat

Correct answer: degree of superheat

Solution

Increasing the degree of superheat raises the temperature of the molten metal above its melting point, which reduces its viscosity and enhances fluidity, allowing it to flow more easily into molds.

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