Name the head quarter of 'South Central Railway Zone'. 

Who is an empowered worker? 

Name any two natural sources of water pollutants. 

Explain the key areas of human development. 

Give any two examples of tertiary activities.

Define the term 'density of population'. 

Explain any three characteristics of 'Foot Loose Industries'. 

Which is the most significant aspect of human development? 

Which continent has the highest growth rate of population? 

Define the term 'sex ratio'.