What problem would occur if the outer clay covering in lost-wax casting were not strong enough?
Answer and explanation
Correct answer: The mould could crack or break when molten metal was poured
The governing concept is the sequence and structural requirements of lost-wax casting. A wax model is covered with clay, the wax is removed to leave a cavity, and molten metal is poured into that cavity. If the clay shell is weak, heat and the movement or pressure of the molten metal can crack the mould, causing leakage or a defective object. Therefore option A is correct; wax does not become metal and cannot change the metal’s melting point.
Frequently asked questions
What is the correct answer to this question?
The mould could crack or break when molten metal was poured
Why is this the correct answer?
The governing concept is the sequence and structural requirements of lost-wax casting. A wax model is covered with clay, the wax is removed to leave a cavity, and molten metal is poured into that cavity. If the clay shell is weak, heat and the movement or pressure of the molten metal can crack the mould, causing leakage or a defective object. Therefore option A is correct; wax does not become metal and cannot change the metal’s melting point.
Which subject and chapter does this question cover?
This is a Class 12 History question. Chapter: Bricks, Beads and Bones. Topic: craft production.
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