Study Notes: Census, Population & Demography

Overview

Census, population and demography form a critical component of General Knowledge for UP Police Constable exam. Questions frequently test awareness of India's demographic profile, census operations, key indicators like literacy rate and sex ratio, and specific data about Uttar Pradesh. Understanding these metrics is essential as they reflect the socio-economic state of the nation and inform policy decisions. This topic typically appears as 2-4 questions in the General Knowledge section.

Students must focus on memorizing core census years (especially 2011, the last complete census), understanding demographic indicators and their calculation methods, and knowing UP-specific data since state-level statistics are heavily tested. The 2021 Census was postponed due to COVID-19, so 2011 remains the most current complete dataset for exam purposes.

Mastery requires remembering specific numbers (total population, sex ratio figures, literacy percentages) for both India and Uttar Pradesh, understanding demographic trends, and recognizing the significance of various population-related terms and their implications.

Key Concepts

• **Census** is the official enumeration of population conducted every 10 years in India since 1872; the first complete census was in 1881. Census 2011 was the 15th National Census.

• **Sex Ratio** is defined as the number of females per 1000 males. India's overall sex ratio (2011) is 943, while the child sex ratio (0-6 years) is 919, indicating gender imbalance.

• **Literacy Rate** measures the percentage of population aged 7 years and above who can read and write with understanding. India's literacy rate (2011) is 74.04% — male 82.14%, female 65.46%.

• **Population Density** indicates the number of persons per square kilometer. India's density (2011) is 382 persons/sq km, with UP being one of the most densely populated states.

• **Decadal Growth Rate** shows the percentage increase in population over the previous decade. India's decadal growth (2001-2011) was 17.64%, showing a declining trend from previous decades.

• **Demographic Dividend** refers to India's large young working-age population, which presents both economic opportunity and employment challenges requiring skill development and job creation.

• **Census Commissioner** heads the Census operations in India under the Ministry of Home Affairs. The Registrar General and Census Commissioner oversees both Census and Civil Registration System.

• **Provisional vs Final Data**: Census releases provisional population totals first (within months), followed by detailed final data on various parameters over subsequent years.

Formulas / Key Facts

**India - Census 2011 Key Data:**

• Total Population: 121.08 crore (1,210,854,977)
• Male Population: 62.37 crore | Female Population: 58.71 crore
• Sex Ratio: 943 females per 1000 males (improved from 933 in 2001)
• Child Sex Ratio (0-6 years): 919 (declined from 927 in 2001)
• Literacy Rate: 74.04% (Male: 82.14%, Female: 65.46%)
• Population Density: 382 persons per sq km
• Decadal Growth Rate (2001-2011): 17.64%

**Uttar Pradesh - Census 2011 Key Data:**

• Total Population: 19.98 crore (199,812,341) — Most populous state
• Male Population: 10.45 crore | Female Population: 9.53 crore
• Sex Ratio: 912 females per 1000 males (below national average)
• Child Sex Ratio: 902 (concerning decline)
• Literacy Rate: 67.68% (Male: 77.28%, Female: 57.18%)
• Population Density: 828 persons per sq km (more than double national average)
• Most Populous District: Allahabad (now Prayagraj)
• Least Populous District: Mahoba

**States with Best/Worst Indicators (2011):**

• Highest Sex Ratio: Kerala (1084), Lowest: Haryana (879)
• Highest Literacy: Kerala (93.91%), Lowest: Bihar (63.82%)
• Most Populous: Uttar Pradesh, Least: Sikkim
• Highest Density: Bihar (1102/sq km), Lowest: Arunachal Pradesh (17/sq km)

Worked Examples

**Example 1: Calculating Sex Ratio** Question: If a district has 5,20,000 males and 4,80,000 females, what is the sex ratio?

Solution: Sex Ratio = (Number of Females / Number of Males) × 1000 Sex Ratio = (4,80,000 / 5,20,000) × 1000 Sex Ratio = 0.923 × 1000 = 923 females per 1000 males

This indicates gender imbalance as it's below the national average of 943.

**Example 2: Understanding Literacy Rate** Question: In a population of 10,000 people aged 7+ years, 7,500 are literate. What is the literacy rate?

Solution: Literacy Rate = (Literate Population / Total Population aged 7+) × 100 Literacy Rate = (7,500 / 10,000) × 100 = 75%

This is slightly above India's national literacy rate of 74.04%.

**Example 3: Decadal Growth Calculation** Question: A state had population of 5 crore in 2001 and 6 crore in 2011. Calculate decadal growth rate.

Solution: Decadal Growth Rate = [(Population 2011 - Population 2001) / Population 2001] × 100 = [(6 - 5) / 5] × 100 = (1 / 5) × 100 = 20%

This 20% growth is higher than India's average decadal growth of 17.64%.

Common Mistakes

**Mistake 1:** Confusing sex ratio with child sex ratio → Sex ratio covers entire population (943 for India), while child sex ratio is specifically for 0-6 age group (919), which is lower and more concerning.

**Mistake 2:** Thinking 2021 Census data is available → The 2021 Census was postponed due to COVID-19, so 2011 Census remains the latest complete dataset for all exams currently.

**Mistake 3:** Calculating sex ratio as males per females → Always remember: sex ratio = females per 1000 males, not the reverse. A ratio below 1000 indicates fewer females.

**Mistake 4:** Assuming literacy means higher education → Literacy rate only measures ability to read and write with understanding in any language; it doesn't indicate educational qualifications or degrees.

**Mistake 5:** Mixing up UP's rank and actual numbers → UP is most populous (1st rank) but not most literate or best in sex ratio. Don't assume highest population means best in all indicators.

Quick Reference

• **India Population 2011**: 121 crore | UP Population: 19.98 crore (most populous)
• **National Sex Ratio**: 943 | UP Sex Ratio: 912 (below national average)
• **National Literacy**: 74.04% | UP Literacy: 67.68% (below national average)
• **Census Frequency**: Every 10 years since 1872; 15th Census was in 2011
• **UP Population Density**: 828/sq km (India average: 382/sq km)
• **India's Decadal Growth (2001-2011)**: 17.64% (declining trend)