A Brief History On Level! Quiz

Explanation
The correct answer is 17th century. The level, a tool used for determining whether a surface is level or plumb, was invented in the 17th century. This tool consists of a straight edge with a bubble vial or spirit level attached to it, allowing for accurate measurements. The invention of the level greatly aided in construction and engineering projects, ensuring that surfaces were even and straight.

Explanation
Without levels, our buildings would probably lean and be crooked. This is because levels are used to ensure that the floors, walls, and other structural elements of a building are straight and level. Without them, it would be difficult to accurately measure and align the different components, resulting in an unstable and uneven structure. Levels are essential tools in construction and are used to maintain the integrity and stability of buildings.

Explanation
Hot dogs are mostly made by machine because the process of making hot dogs involves grinding and mixing meat, spices, and other ingredients, which is efficiently done by machines. Additionally, the filling of the hot dog casings and the cooking process are also typically automated. This allows for consistent quality and mass production of hot dogs, making it more practical and cost-effective to use machines in the manufacturing process.

Explanation
A sandpaper with a small grain size is ideal for achieving a fine or "polished" finish. The smaller grains on the sandpaper create more friction and allow for a smoother sanding action. This results in a finer and more even surface texture. Using a sandpaper with larger grains would remove more material and create a rougher finish, while using a sandpaper with no grain would not effectively remove any material at all. A medium grain sandpaper may still leave visible scratches on the surface, making it less suitable for achieving a polished finish.

Explanation
The mineral mix used to create abrasive grains is heated to a temperature of 3,600 degrees. This high temperature is necessary to melt and fuse the minerals together, forming the abrasive grains. At this temperature, the minerals become molten and can be shaped into the desired abrasive grain form.