Ordinary level 2026 North West mock materials technology and workshop processes 2

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MATERIALS TECHNOLOGY

Question 1: PROPERTIES OF METALS

a- Define the following as regards properties of metals. ($0.5\text{ mark} \times 4 = 2\text{ marks}$)

• Hardness: _______________________________________________

• Strength: ________________________________________________

• Ductility: ________________________________________________

• Hardness (Repeated): ______________________________________

b- Differentiate between physical properties of metals and mechanical properties and give two (02) examples in each case. ($3\text{ marks}$)

c- The hardness of a metal can be determined by using a series of tests. Name three (03) of them. ($1 \times 3 = 3\text{ marks}$)

d- The selection of a paper material for engineering purposes is one of the most difficult problems for designers. State three (03) factors that should be considered while selecting engineering materials. ($1\text{ mark} \times 3 = 3\text{ marks}$)

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Question 2: MELTING FURNACES

Context: Figure 1 (shown in image image_4741ab.jpg) represents a type of furnace used in the production of cast iron.

a- Identify the type of furnace below. ($1\text{ mark}$)

b- Briefly explain what happens in the following zones. ($1\text{ mark} \times 3 = 3\text{ marks}$)

• Reduction zone: ____________________________________________

• Melting zone: ______________________________________________

• Preheating zone: ____________________________________________

c- Give the name of zone 4. Which are the exothermic (heat releasing) reactions that take place in this zone? ($2\text{ marks}$)

d- Name two (02) properties of cast iron. ($0.5\text{ mark} \times 2 = 1\text{ mark}$)

e- Complete the table below. ($0.5\text{ mark} \times 6 = 3\text{ marks}$)

Type of cast iron	Percentage of carbon	One application (use) in the vehicle
Grey cast iron
Malleable cast iron
White cast iron	$3.2$ to $3.6\%$
Spheroidal graphite cast iron		wheels

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Question 3: HEAT TREATMENT OF METALS AND ALLOYS

a- Define heat treatment. ($0.75\text{ mark}$)

b- Give any three (03) reasons or objectives for carrying out heat treatment on metals. ($1.5\text{ mark}$)

c- State precisely the objectives or purposes of the following heat treatment processes on steel. ($1\text{ mark} \times 3 = 3\text{ marks}$)

• Case hardening: ____________________________________________

• Annealing: ________________________________________________

• Tempering: ________________________________________________

d- Hardening.

• i) Name any three (03) methods of carrying out surface hardening on carbon steels. ($0.25\text{ mark} \times 3 = 0.75\text{ mark}$)

• ii) Cite four (04) vehicle components that are subjected to a hardening heat treatment process. ($2\text{ marks}$)