: State of Matter Science Quiz Test For Kids in 1st, 2nd and 3rd grades. In this quiz students will be shown pictures of objects and they have to determine if they are in the form of gas, liquid or solid. Matter is one of three forms. However, some substances can change from one form to another depending on what conditions they are subjected to for example if water is cooled it changes to ice, if water vapor is cooled it changes to water, if solid water (ice) is heated it changes to liquid. This is an interactive online science test which parents and teachers can use to supplement their kid's or student's regular course.