📌 CDS Focus 2022–2026: Exam tests Census 2011 data (density, sex ratio, literacy, most/least populated states), HDI components and India's rank, push-pull migration factors, transport networks (Golden Quadrilateral, NH-44 = longest, Konkan Railway), and economic activity classification (Primary/Secondary/Tertiary/Quaternary). Average students should memorise key census statistics and transport project facts.
1. Population of India — Key Statistics (Census 2011)
Fig. 1.1 — India Population: Key Census 2011 Facts at a Glance
⚠️ Census Traps: (1) Most densely populated state = Bihar (not Delhi — Delhi is a UT). (2) Highest sex ratio = Kerala (1,084). (3) Highest literacy = Kerala (94%). (4) Lowest literacy = Bihar. (5) Smallest state by area = Goa; least populated = Sikkim. (6) Child sex ratio (0–6 age) = 919 — lowest: Haryana. (7) India's population growth rate declined from 21.5% (1991–2001) to 17.7% (2001–2011).
MIGRATION & URBANISATION
2. Migration & Urbanisation
🚊 Push & Pull Factors of Migration
Push factors (from source): Poverty, unemployment, drought, natural disasters, lack of education & healthcare, conflict, land fragmentation
Smart Cities Mission (2015): 100 cities for sustainable urban development
HUMAN DEVELOPMENT INDEX
3. Human Development Index (HDI)
Fig. 3.1 — HDI Components & India's Performance
ECONOMIC ACTIVITIES & TRANSPORT
4. Economic Activities & Transport
⚙️ Types of Economic Activities
Primary: Direct extraction from nature. Agriculture, fishing, mining, forestry, animal husbandry. Most Indian workers in this sector
Secondary: Manufacturing & construction. Transforms raw materials into goods. Steel plants, textile mills, food processing
Tertiary: Services sector. Trade, transport, banking, education, healthcare, tourism. Largest contributor to India's GDP (~55%)
Quaternary: Knowledge-based services. IT, research, media, consultancy, finance. Growing rapidly in India
🚊 Road Transport — Key Facts
Golden Quadrilateral: Delhi–Mumbai–Chennai–Kolkata. Total ~5,846 km. Largest highway project in India. 4/6-lane expressways
North-South & East-West Corridor: Srinagar to Kanyakumari (NS) and Silchar to Porbandar (EW)
Longest NH: NH-44 (Srinagar–Kanyakumari) ~3,745 km
India's road network: 2nd largest in world (~63 lakh km)
Pradhan Mantri Gram Sadak Yojana (PMGSY): All-weather roads to rural areas
Fig. 4.1 — Transport Networks: Road, Rail, Air & Water — Key Facts
Topic ERailway Zones of India — CDS DirectFrequently Tested
Zones
India has 18 railway zones. Largest zone by route: Northern Railway (NR). Longest zone by area: Eastern Railway + Northeast Frontier Railway. Konkan Railway (KR) = special purpose zone along W. coast (760 km, built 1998).
Key Lines
Konkan Railway (Roha, Maharashtra to Mangaluru, Karnataka) — built through difficult Western Ghats terrain. India's first computerised railway. Metro Rail: First metro = Kolkata (1984). Largest metro network = Delhi.
Ports
12 Major Ports under central government. Largest by cargo: Paradip (Odisha) in recent years. Mumbai (Jawaharlal Nehru Port) = largest container port. Kandla (Gujarat) = earliest/free trade zone port. Ennore (Chennai) = first corporate port.
📐 Formula Sheet & Key Facts — GC13
Census 2011 Numbers
Population: 121.09 crore Density: 382/km² Sex ratio: 943/1000 Literacy: 74.04%
State Rankings (Census 2011)
Highest density: Bihar (1,102) Highest sex ratio: Kerala (1,084) Highest literacy: Kerala (94%) Most populous state: Uttar Pradesh
HDI Components
Health: Life expectancy at birth Education: Mean + expected schooling years Income: GNI per capita (PPP $) India rank: ~134/193 (Medium HDI)
Golden Quadrilateral: ~5,846 km Longest NH: NH-44 (~3,745 km) India road network: 2nd largest in world Expressways under NHAI
Key Transport Facts
Railway zones: 18 Konkan Railway: Roha–Mangaluru, 760 km Busiest airport: IGI, Delhi Largest port: JNPT, Mumbai (containers)
📝 Topic-Wise PYQs & Tricky Questions — GC13
Q1. As per Census 2011, which state has the highest population density in India? CDS PYQ
(a) Uttar Pradesh(b) West Bengal(c) Bihar(d) Kerala
✔ Answer: (c) Bihar
Bihar has India's highest population density among states at 1,102 persons per km² (Census 2011). West Bengal is second (~1,029). Uttar Pradesh has the highest total population but not the highest density. The national average is 382/km². Arunachal Pradesh has the lowest density (17/km²). Note: Delhi UT has the highest density (~11,320) but is a Union Territory, not a state.
Q2. The Golden Quadrilateral highway connects which four cities? CDS PYQ
The Golden Quadrilateral (GQ) is India's largest highway project connecting the four metropolitan cities: Delhi (North), Mumbai (West), Chennai (South), Kolkata (East) — forming a quadrilateral shape on the map. Total length ~5,846 km. It's a 4/6 lane expressway network under NHAI. The North-South Corridor (Srinagar to Kanyakumari) and East-West Corridor (Silchar to Porbandar) are separate projects that intersect at Nagpur.
Q3. Human Development Index (HDI) is computed by which international organisation? CDS PYQ
(a) World Bank(b) IMF(c) UNDP(d) UNESCO
✔ Answer: (c) UNDP
HDI (Human Development Index) is published by UNDP (United Nations Development Programme) in its annual Human Development Report. HDI = composite of three dimensions: Health (life expectancy), Education (mean + expected schooling years), and Income (GNI per capita in PPP $). India consistently ranks in the "Medium Human Development" category (~134/193 in recent reports).
Q4. Konkan Railway connects which two cities? ⚡ Tricky
(a) Mumbai to Mangaluru(b) Roha to Mangaluru(c) Goa to Kochi(d) Ratnagiri to Kochi
✔ Answer: (b) Roha to Mangaluru
Konkan Railway runs from Roha (Maharashtra) to Mangaluru (Karnataka) — a distance of ~760 km. Built through very difficult terrain of the Western Ghats, it has 91 tunnels and 179 major bridges. It was completed in 1998. The common trap is Mumbai — but the actual starting point is Roha (about 100 km south of Mumbai). It passes through Goa and coastal Karnataka. It's India's first computerised railway and uses the Konkan Railway Corporation Ltd (KRCL).
Q5. Which sector contributes the highest share to India's GDP? CDS PYQ
The Tertiary (Services) sector contributes about 55% of India's GDP — the largest share. This includes trade, banking, transport, IT, tourism, healthcare, and education. Agriculture (Primary) contributes about 15–18% but employs ~45% of the workforce — showing the contrast between economic contribution and employment. Manufacturing (Secondary) contributes about 25%. India is a services-led economy, not manufacturing-led (unlike China).
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