Q.Write short note on the development of Indian railway.

The contribution of industries to India's national income in 2013-14 was about 27 % — option (b).

The industrial sector (manufacturing, mining, construction, electricity, etc.) is a major driver of economic development. In 2013-14 it accounted for roughly 27 % of India's national income. This is much less …

There are 3 main ways to generate electricity in India — option (d): thermal, hydel (water) and atomic (nuclear) power.

Power is a key infrastructure input for industrial growth. In India electricity is produced chiefly through three conventional sources:

1. Thermal power — from coal, oil and natural gas (the largest share).
2. Hydro (hydel) power — from the force of flowing/stored water at dams. …

Coal-based electricity is called thermal power.

When coal is burnt to heat water into high-pressure steam that drives turbines and generators, the electricity so produced is called thermal power or thermal electricity. Thermal power stations based on coal are a major source of electricity in India …

Industry's share in employment in 2011-12 was about 24.3% — option (c).

One indicator of the pace of industrialisation is the share of the workforce employed in industry. In 2011-12, industry provided roughly 24.3% of India's total employment — far less than agriculture, reflecting that industrial growth in India has not …