Q.Classify industries on the basis of the nature of their output, with examples of each.

By output, industries fall into basic/key, capital-goods, and consumer-goods categories, each playing a distinct role in the industrial structure.

This threefold division is the basis on which India's early industrial policy decided which industries the state would control directly.

Industries can be classified by the nature of what they produce into three broad categories. Basic or key industries produce essential inputs on which the rest of the industrial structure depends — examples include iron and steel, coal mining, heavy chemicals, cement, and power generation; because so much else depends on them, these were treated as strategically important in India's early planning and placed substantially under public-sector control. Capital-goods (or producer-goods) industries manufacture the machinery, tools and equipment that other industries use to produce further goods — examples include machine tools, heavy electrical equipment and industrial machinery manufacturing; without a domestic capital-goods base, a country must import machinery for every other industry it wishes to build, so developing this category was a major planning priority after independence. Consumer-goods industries produce goods meant for direct final consumption by households — examples include textiles, food processing, footwear, sugar and consumer electronics; these industries are generally more labour-intensive and quicker to establish, and dominated India's industrial base before independence. Recognising which category a given industry belongs to is essential to understanding why India's industrial policy treated different industries so differently.

A common error is confusing 'basic/key industries' with 'capital-goods industries' — the former supply raw/essential inputs like steel and power, while the latter supply machinery; students should give distinct examples for each rather than repeating the same example across categories.