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Why should the moulding sand be porous?(a) For gases to enter(b) For gases to escape(c) For water to enter(d) For water to escape |
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Answer» Correct answer is (b) For gases to escape To explain: A moulding sand is the one in which, the sand is known to have holes in it and also it is known for holding some amount of moisture content. A moulding should be having pores and should be permeable so that the gases have a free path for escaping. |
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