What is polar coordinates ? Explain with the help of diagram.

What is an electric circuit ? Explain with the help of a diagram.

What is meant by a food web? Explain with the help of a simple diagram.

What is meant by viable industry? Explain with the help of a diagram.

What is meant by viable industry? Explain with the help of a diagram.

What is the cause of friction ? Explain with the help of labelled diagram.

What type of elastic fuse is used in electrical appliances like car stereos ? Explain with the help of a labelled diagram.