a) Large scale industries:
i) The capital required for the establishment of an industry is more than one crore, the industry is called as large scale industry.
ii) Iron and Steel, Oil refineries, Cement and textile industries are the best examples for large scale industries.
b) Small scale industries:
i) The capital required for the establishment of an industry is less than one crore, the industry is called as small scale industry.
ii) Silk weaving and household industries belong to this category.

i) Quinary economic activities refer to the high level decision making processes by executives in industries, business, education and government
ii) This sector include top executives or officials in the fields of science and technology, universities, health care etc.
iii) For example, the council of ministers take decisions to introduce various people welfare schemes in the state.

1. Primary Economic Activities (e.g., Raw cotton production)
2. Secondary Economic Activities (e.g., Spinning mill)
3. Tertiary Economic Activities (e.g., Banking ) 

Any action that involves in the production, distribution, consumption or services is an economic activity.

Secondary activities are those that change raw materials into usable products through processing and manufacturing. Bakeries that make flour into bread and factories that change metals and plastics into vehicles are examples of secondary activities.