Question

To avoid the fusion of the mould wall, the sand material should have high

 Hot strength

 Permeability

 Collapsibility

 Refractoriness

Answer 1

Hi,








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Answer 2

"The answer should be refractoriness. Mould is a type of fungi that leaves patches on a wall.

They mainly occur on walls which are higher in humidity. If the wall is wet and it is exposed to water the wall gets molds quickly.

So to avoid this and we should have a high ability of high ability of refractoriness which means the resistance to rain and humidity.

"