Assess students' ability to predict whether everyday objects will sink or float and to explain their reasoning by applying basic concepts of density, buoyancy, and material properties. The quiz uses common classroom items (e.g., wood, metal, plastic, sponge, rock), asks students to make predictions, compare with simple observations from tests, and provide brief evidence-based explanations. Suitable for Grade 3–5; focuses on applying concepts to real objects and articulating why outcomes occur.