Year 8 Technology Quiz

Explanation
A coping saw is a type of saw that is commonly used for cutting intricate curves and shapes in woodworking, including cutting jigsaw puzzle pieces. It has a thin, narrow blade that is held in tension by a frame, allowing for precise and controlled cutting. The other options listed, such as the circular saw, band saw, and tenon saw, are not typically used for cutting jigsaw puzzle pieces as they are better suited for other types of cuts and woodworking tasks.

Explanation
Vacuum forming is the process used to make trays for jigsaw puzzles. This method involves heating a plastic sheet until it becomes pliable, then placing it over a mold and using a vacuum to suction the plastic tightly onto the mold's surface. This creates a tray with the desired shape and form. Blow molding, injection molding, casting, and calendering are different processes used in manufacturing, but they are not specifically used for making trays for jigsaw puzzles.

Explanation
A belt sander is a machine that is commonly used to clean and smooth the edges of plastic materials. It consists of a continuous loop of sandpaper that rotates around two drums, allowing it to quickly and efficiently remove excess material and create a smooth finish. A file, on the other hand, is a handheld tool with a rough surface that is used for shaping and smoothing surfaces by hand. Both a belt sander and a file can be used to clean the edges of plastic, making them both correct answers.

Explanation
Acrylic and perspex are both types of plastic. They are commonly used in various industries due to their durability, versatility, and transparency. Acrylic is a synthetic resin made from polymethyl methacrylate, while perspex is a brand name for acrylic sheets. MDF (medium-density fiberboard) and chipboard, on the other hand, are not types of plastic but rather engineered wood products made from compressed wood fibers.

Explanation
MDF stands for Medium Density Fibreboard. This is a type of engineered wood product that is made by breaking down hardwood or softwood residuals into wood fibres, combining them with wax and a resin binder, and forming panels by applying high temperature and pressure. MDF is known for its smooth surface, uniform density, and strength, making it a popular choice for furniture, cabinetry, and other interior applications.

Explanation
The coping saw is primarily used for cutting curves. Its thin blade and ability to rotate make it ideal for maneuvering around tight corners and intricate shapes. While it can also be used for straight cuts, its design and functionality make it most effective for cutting curves in materials such as wood or plastic.

Explanation
The correct answer is to always wear goggles, always wear an apron, and tuck in your tie. These safety rules are important in a workshop setting to protect oneself from potential hazards. Wearing goggles helps to protect the eyes from flying debris or chemicals. Wearing an apron can prevent clothing from getting caught in machinery or being stained by substances. Tucking in your tie ensures that it does not get caught in any equipment, reducing the risk of accidents.