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Which of the following problems arises in die casting that can be solved by having vacuum die casting?

Which of the following problems arises in die casting that can be solved by having vacuum die casting? Correct Answer Air in the cavity

The major problem with die casting is the air left in the cavity after closing of die. Since the air cannot escape out so it remains inside the casting. This result in the generation of blisters, which basically appears on the surface of the castings, when the casting is heat treated. This problem can be solved by implementing a vacuum die casting method.

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Which of the following is a limitation of die casting, but is overcome in vacuum die casting?
In vacuum die casting, the molten metal enters into the cavity slowly as compared to the die casting.
The castings made by vacuum die casting have more strength than the castings made by die casting.
In vacuum die casting, the melt enters into the mould cavity with less speed than that in the die casting technique.
Consider the following statements. (1) Hot chamber machine is used for casting zinc, tin and other low melting alloys (2) Cold chamber machine is used for die casting of ferrous alloys (3) Rapid cooling rate in die casting produces high strength and quality in many alloys Which of these statements are correct? 
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The moving cores are used in the vacuum die casting, which are parallel to the movement of a die.