Grade 10 metalwork ā Introduction to Metalwork Quiz
1. What is metalwork?
Metalwork involves practical activities with metals ā measuring, cutting, shaping and joining ā to produce tools, parts and finished products.
2. Which of the following is a ferrous metal?
Ferrous metals contain iron; steel is iron-based, magnetic and prone to rust, unlike non-ferrous metals such as aluminium, copper and brass.
3. Which property of a metal describes its ability to be hammered into thin sheets?
Malleability is the ability of a metal to be deformed by hammering or rolling into thin sheets; ductility is drawing into wire.
4. Which property describes a metal's ability to be drawn into wire?
Ductility is the capacity of a metal to be stretched into a wire without breaking, different from malleability which is sheet formation.
5. Which metal is lightweight, non-magnetic and resistant to rust?
Aluminium is light, non-magnetic and forms a protective oxide layer so it does not rust like iron-based metals.
6. Which tool is used to hold a workpiece firmly while you work on it at the bench?
A bench vice clamps the work securely to the bench so you can saw, file, drill or shape it safely and accurately.
7. Which personal protective equipment is essential when welding?
A welding helmet protects eyes and face from intense light, UV rays and sparks; ordinary sunglasses or a dust mask do not give sufficient protection.
8. What is the purpose of a centre punch in metalwork?
A centre punch makes an indentation where a drill bit should start so the bit does not slip off the mark when drilling.
9. Which tool is best for cutting thin sheet metal by hand?
Tin snips are designed to cut sheets of metal cleanly by hand; a hacksaw is better for bars and rods, not thin sheet.
10. Which tool gives very accurate measurements of small external dimensions to 0.01 mm?
A micrometer is a precision instrument for measuring small outside dimensions very accurately; tape measures and squares are much less precise.
11. Which process joins metals by melting base metal and filler using an electric arc?
Welding melts the base metals (and often a filler) to form a fused joint; brazing and soldering use lower temperatures and do not melt the base metal.
12. Which joining method uses a filler metal with a higher melting point than solder but lower than the base metal, usually applied with a torch?
Brazing uses a filler that melts at higher temperatures than solder but below the base metal, joining parts without melting the base metals.
13. What does annealing do to a metal?
Annealing softens metal and relieves stresses by heating and slow cooling; rapid cooling (quenching) usually hardens metal instead.
14. Which of these is a common hazard in a metalwork workshop?
Metalwork involves hot sparks, hot metal and sharp edges that can burn or cut; identifying and controlling these hazards is essential.
15. Which method is commonly used to protect steel from rusting in outdoor conditions?
Galvanizing applies a zinc coating that protects steel from corrosion outdoors; annealing, welding or filing do not prevent rust.
16. Which metal is most commonly used for electrical wiring because of its high conductivity?
Copper has excellent electrical conductivity and is widely used for wires and electrical connections in buildings and equipment.
17. What does 'Jua Kali' refer to in Kenya's context related to metalwork?
Jua Kali describes Kenya's informal craftsmen and small workshops that make metal tools, furniture and repairs using basic skills and recycled materials.
18. How should oxygen and acetylene cylinders be stored in a workshop?
Gas cylinders must be stored upright, secured to prevent falling, valves closed and oxygen separated from flammable gases to reduce fire risk.
19. Which tool is used to produce a spark to light a gas welding torch safely?
A striker makes a controlled spark to light welding burners safely; matches or casual lighters are unsafe around gas cylinders and petrol.
20. Which tool is best for quickly removing metal and shaping stock using abrasive wheels?
A bench grinder uses rotating abrasive wheels to grind, shape and dress metal quickly; squares, punches and scribers are for measuring and marking.
21. Which tool is used to check that two surfaces are at a right angle?
A try square checks and marks 90Ā° angles on metal and wood; a tape measure measures length but cannot reliably check right angles.
22. Which metal is commonly used for lightweight frames of bicycles and some parts of small aircraft?
Aluminium is light and reasonably strong, making it suitable for bicycle frames and aircraft parts where weight savings matter.
23. What is the main purpose of flux in brazing or soldering?
Flux cleans oxides from metal surfaces and prevents new oxidation during heating, allowing the filler metal to wet and bond the joint.
24. Which tool is used to cut external threads on a round rod by hand?
A die cuts external threads (on bolts and rods); a tap cuts internal threads (in nuts or holes).
25. Why do teachers always say 'measure twice, cut once' in metalwork?
Measuring twice reduces the risk of cutting the wrong size, saving material, time and cost ā an important practice in workshops and Jua Kali metalwork.
26. What is metalwork?
Metalwork is the practical trade of shaping, joining and finishing metals to produce or repair useful items.
27. Which personal protective equipment is most important to protect your eyes from sparks when grinding metal?
Safety goggles protect the eyes from flying sparks and metal particles produced during grinding.
28. Which of these is a characteristic of ferrous metals?
Ferrous metals contain iron, which makes them magnetic and susceptible to rust (corrosion) if unprotected.
29. Which of the following is a nonāferrous metal?
Aluminium does not contain iron, making it nonāferrous; it is lightweight and resists rust.
30. What does the term 'malleability' mean for a metal?
Malleability describes how easily a metal can be deformed into thin sheets without cracking.
31. What does 'ductility' refer to in metals?
Ductility is the metal's ability to stretch into a wire without breaking, useful for electrical conductors and springs.
32. Which property describes a metal that resists scratching or indentation?
Hardness measures how well a metal can resist abrasion, scratching or penetration.
33. What is annealing in simple terms?
Annealing involves heating and slow cooling to reduce hardness and increase ductility, making the metal easier to work.
34. Which describes the process of hardening steel?
Hardening usually involves heating steel to a high temperature then quenching it quickly to increase its hardness.
35. What is the purpose of tempering after hardening steel?
Tempering reheats hardened steel to a lower temperature to relieve stresses and reduce brittleness while retaining useful hardness.
36. Which joining method actually melts the base metals so they fuse together?
Welding melts the base metals (and usually adds filler) so the pieces fuse together when cooled; other methods join without melting the base metal.
37. Soldering is commonly used for which type of work?
Soldering uses a lowāmelting filler metal to join small parts and electrical connections without melting the base metals.
38. What is a rivet used for in metalwork?
A rivet is a permanent mechanical fastener that is deformed (peened) to hold two pieces together.
39. Which hand tool is best for cutting a mild steel round bar to length in a school workshop?
A hacksaw is a hand saw designed for cutting metal bars and rods to length; files are for finishing, not primary cutting.
40. What is the main purpose of a bench vice in the metalwork workshop?
A bench vice clamps and holds work steady so it can be cut, filed or drilled safely and accurately.
41. What is a centre punch used for before drilling a hole?
A centre punch makes a small dent at the drill position so the drill bit does not wander when starting.
42. Which measuring tool gives more precise measurements than a steel rule for small dimensions?
A vernier caliper measures internal, external and depth dimensions more precisely than a simple steel rule.
43. Why is markingāout important before cutting or drilling metal?
Markingāout transfers the planned measurements onto the workpiece so cuts and holes are made in the correct positions.
44. Which method helps prevent rust on iron tools and steel components?
Protective coatings like paint, oil or zinc (galvanising) stop moisture and oxygen reaching the metal and prevent rust.
45. Which metal is commonly used for making cooking pots and jikos in Kenya because it is light and conducts heat well?
Aluminium is lightweight, conducts heat well and is widely used for cooking pots and jikos in Kenya.
46. What is the main purpose of using files in metalwork?
Files abrade small amounts of material to finish edges, achieve accurate fits and smooth surfaces.
47. When filing a metal edge by hand, which stroke typically removes material?
Most hand files cut on the forward stroke; the return stroke is used lightly to reposition without removing much material.
48. Which of these is an alloy rather than a pure metal?
Brass is an alloy made from copper and zinc; alloys combine metals to produce different properties than pure metals.
49. What does galvanising do to steel or iron?
Galvanising applies a zinc coating that sacrificially protects steel or iron from rusting.
50. Which workshop rule is correct when adjusting or cleaning a power machine?
Turning off and isolating power prevents accidental starts and reduces the risk of injury while adjusting or cleaning machinery.