To construct a working model of Physics class 12 level, you have to refer to the teacher's guide. The teacher's guide provides how the construction should be done based on the current curriculum.

Polynomials are the simplest class of mathematical expressions. The expression is constructed from variables and constants, using only the operations of addition, subtraction, multiplication and non-negative integer exponents.

A simple working science model for class 11 can be a solar system model. The pieces for this system model can be picked up at any crafts store, different sized styrofoam balls and finger paints will get you started.

There are many forms for models someone could make for their science class. Depending on the type of science class it is and what parts have been taught already would depend on a appropriate model.

Daniel Rossides was a sociologist who used the five class model to describe the class system. The five classes are upper class, upper-middle class, lower-middle class, working class, and lower class.

A working model can be made of whatever kind of material is handy. The model should show the exact method of waste management in detail. For example, bins for recycling and where they will be located.