This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.
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20. The diagram shows a piece of wood that is curved across its width, which is a wood defect known as cup. The correct option is D. d) Cup 21. Non-ferrous metals do not contain iron. Aluminium, Tin, and Copper are non-ferrous metals. Pig iron is an iron alloy, making it a ferrous metal. The correct option is C. c) Pig iron 22. Pig iron is produced in a blast furnace using iron ore as the source of iron and coke as a fuel and reducing agent. The correct option is A. a) Iron ore and Coke 23. A manufactured board is an engineered wood product. Plywood is an example of a manufactured board, made from thin layers of wood veneer bonded together. The correct option is A. a) Plywood 24. A reduced scale is represented by a ratio where the drawing dimension is smaller than the actual dimension (e.g., 1:50, 1:100, 1:1000). A ratio of 100:1 indicates an enlarged scale, where the drawing is larger than the actual object. The correct option is B. b) 100:1 25. A Tee square is a drawing instrument composed of two main parts: the long blade and the shorter, perpendicular stock (or head). The correct option is B. b) Stock and blade