AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
Iron and steel is classified as a heavy industry because all its raw materials (iron ore, coking coal, limestone) and finished goods are heavy and bulky, entailing heavy transportation costs.
Source: Iron and Steel Industry, Chapter 6
The passage directly defines why it is a "heavy industry" — the key phrase examiners look for is "heavy and bulky raw materials and finished goods" leading to "heavy transportation costs". Naming the raw materials (iron ore, coking coal, limestone) adds precision and can fetch full marks. Keep it to one line for a 1-mark answer.