Grade 7 Pre-technical – MEASURING AND MARKING OUT TOOLS Quiz
1. Which tool is best for measuring long distances on a building site up to several metres?
A tape measure is flexible and long (often 5 m or more), so it is best for measuring long distances on site. Rulers and steel rules are short (30 cm to 1 m) and calipers are for small, precise measurements.
2. Which tool gives accurate measurements of small outside dimensions to the nearest 0.1 mm?
A micrometer is designed for very precise measurement of small outside dimensions (to 0.01–0.1 mm), more precise than a vernier caliper or tape measure.
3. Which tool is used to mark a line parallel to the edge of a piece of wood?
A marking gauge has a fence and a scribing point that lets you mark lines parallel to an edge consistently, which is useful in woodworking.
4. Which tool is used to check if two surfaces meet at a right angle (90°)?
A try square is specifically made to check and mark 90° angles in woodworking and metalwork.
5. Which tool is used for drawing circles or marking equal distances from a centre?
Dividers have two pointed legs and are used to scribe circles or transfer and compare distances from a centre point.
6. Which tool is used together with a hammer to make a small dent that guides drilling?
A centre punch is struck with a hammer to make a small indent that prevents the drill bit from wandering when starting a hole.
7. Which tool measures the thickness of a small object very precisely, often used for sheet metal?
Micrometers are used for precise thickness measurements of small objects, such as sheet metal or wire, to a high degree of accuracy.
8. Which tool shows if a surface is horizontal by using a bubble in a liquid tube?
A spirit level contains a vial with liquid and a bubble; when the bubble is centred, the surface is horizontal (level) or vertical (plumb).
9. Which tool is used to mark a long straight line quickly across a wall or large board?
A chalk line (snap line) is snapped across a surface to leave a long straight chalk mark, useful for quick straight guides over long distances.
10. Which tool is used to scratch a fine line on metal for marking out before cutting?
A scriber is a hardened steel point used to scratch fine, visible lines on metal for accurate marking out.
11. Which tool is used to measure angles between two lines or surfaces?
A protractor measures or helps draw angles (usually in degrees) and is the common tool for checking angle sizes.
12. Which tool provides a very flat reference surface used when checking accuracy of other tools?
A surface plate is a very flat, stable plate (usually cast iron or granite) used as a reference for inspection and marking out.
13. Which tool can measure the inside diameter of a pipe by using its inside jaws?
A vernier caliper has inside jaws designed to measure internal diameters and depths as well as external dimensions.
14. Which tool is useful for setting and checking both 45° and 90° angles and for measuring small distances?
A combination square has a sliding head that lets you measure and mark 90° and 45° angles, and often includes a ruler for measuring small distances.
15. Which unit is most useful in the workshop for small measurements like the length of a screw or thickness of a board?
Millimetres are the preferred unit for small, precise workshop measurements because they allow accurate marking and measuring of small parts.
16. Before taking a measurement with a tape, what should you do to get an accurate reading?
Keeping the tape straight and taut removes slack and sagging that would make the measured length too long or inaccurate.
17. Why is careful marking out important before cutting or drilling?
Careful marking out gives a clear guide for cutting or drilling so parts fit correctly and mistakes are reduced.
18. Which tool is best for marking a neat, accurate centre line along the length of a wooden board?
A marking knife cuts a fine, clean line in wood fibres that gives a more accurate guide for sawing or planing than a pencil line.
19. Which tool can be used to measure the depth of a hole or slot?
A vernier caliper has a thin depth rod that slides out from the end and can be used to measure the depth of holes or slots accurately.
20. Which tool is used to transfer a measurement from a ruler to a workpiece by holding two points at the correct distance?
Dividers can be set to a measurement on a ruler and then used to step off or transfer that distance onto the workpiece unchanged.
21. Which tool is used to copy or set an angle between two pieces before marking or cutting?
A bevel gauge (or sliding bevel) can be set to any angle and then locked, allowing you to transfer that angle to other pieces for marking or cutting.
22. What is the main use of a centre punch when marking out metal?
The centre punch makes a small dent on the metal at the marked centre so the drill bit starts in the correct place without slipping.
23. How should measuring and marking tools be stored after use to keep them accurate?
Keeping tools clean, dry and stored correctly prevents rust, damage and loss of accuracy so they remain reliable.
24. When cutting along a marked line on wood, why should the line be clear and visible?
A clear marked line gives a proper guide for the saw, helping you cut accurately and avoid wasting material.
25. Which tool is best for checking and transferring angles that are not exactly 45° or 90°?
A bevel gauge can be adjusted to any angle (not limited to 45° or 90°) and locked so the angle can be transferred or checked easily.