NCERT Solutions for Class 7 Social Science (Exploring Society) Chapter 19: Infrastructure: Engine of India’s Development (NCERT 2026–27)
These Class 7 Social Science Exploring Society Chapter 19 solutions cover Infrastructure: Engine of India’s Development from Exploring Society: India and Beyond (Part 2), the new NCF-2023 textbook for the 2026–27 session. The chapter belongs to the theme Economic Life Around Us and explains what physical infrastructure is, how India’s transport, communication and energy networks have grown, how good infrastructure improves the quality of life, and why caring for public infrastructure is a collective responsibility. Below you get step-by-step answers to every question in the textbook’s Questions and activities, clear notes on key terms, extra practice, MCQs, Assertion–Reason and FAQs.
Class: 7Subject: Social ScienceBook: Exploring Society: India and Beyond (Part 2)Chapter: 19Theme: Economic Life Around UsSession: 2026–27
Class 7 Social Science Exploring Society Chapter 19 – Overview
Chapter 19, Infrastructure: Engine of India’s Development, explains that physical infrastructure is the vast network of tangible structures — roads, bridges, railways, electricity, water pipelines, communication networks, energy projects and more — built to keep our cities and villages functioning. Through Rishabh’s journey from Delhi to Nashik and Satish the tomato farmer’s story, the chapter shows how transport, power, cold storage and the internet are connected “like pieces of a puzzle.” It surveys India’s transportation infrastructure (roads and highways, railways, metro systems, air transport, shipping and ports), its communications infrastructure (telegraph, telephone, internet, e-governance and e-commerce), and the contribution of Indian scientist J.C. Bose to wireless transmission. It closes with our collective responsibility to use and maintain public infrastructure, the need for safe and sustainable, eco-friendly design, and the rules for roads and waterworks described long ago in Kautilya’s Arthaśāstra.
Key Concepts & Terms
Physical infrastructure: the vast network of tangible (physical) structures built to keep cities and villages functioning — transportation systems, utilities, communication networks, energy infrastructure and so on.
Transportation infrastructure: the systems that enable the mobility of people and goods — roads and highways, railways, metro trains, air transport, and shipping and ports.
Types of roads: local roads (built and maintained locally), state highways (built and maintained by states through their public works departments), and national highways and expressways (built and maintained by the central government).
Golden Quadrilateral: an important highway network connecting four of India’s major cities — Delhi, Mumbai, Chennai and Kolkata. NH44 is India’s longest national highway (4,112 km), running from Srinagar to Kanyakumari.
Communications infrastructure: cables, wireless devices, towers, satellites and data centres that enable transmitting messages, images and videos quickly across distances.
E-governance: the use of communication technologies by government to deliver services to citizens — for example, the DigiLocker app to store documents like the Aadhaar card and driving licence online.
E-commerce: buying or selling products and services conducted on online platforms or over the internet.
Patent: a right granted by the government or institutions to be the only person or company who can make, sell or use an invention for a certain number of years.
Social infrastructure: facilities such as schools, colleges, hospitals, health centres, police stations, fire stations, courts, parks, libraries and community centres that support the wellbeing and development of communities.
Sustainable infrastructure: infrastructure that uses cleaner energy and environment-friendly materials to minimise pollution and harm to biodiversity, and that considers the needs of children, the elderly and disabled persons.
“Questions and activities” — Full Solutions
All questions below are reproduced verbatim from the NCERT textbook’s end-of-chapter Questions and activities section. Answers are original, written in exam-ready style. Activity-based questions are answered with model responses that you can adapt to your own area.
1. Which form of physical infrastructure has been built in your area in the last decade? How do you think it has benefitted you or your family members? If you could build something for the community, what would it be?
ANSWERThis is an observation activity, so answers will vary with where you live; write about what you have actually seen. A model answer: in the last decade, a wide concrete road with a new flyover was built in my area, along with underground water pipelines and high-speed internet (fibre) connections.How it has benefitted us: the new road and flyover have cut our travel time to school, the market and the hospital, and reduced traffic jams. Buses and ambulances now reach quickly, my parents can travel to work easily, and shopkeepers receive goods on time. The internet lets us attend online classes, make digital payments and use e-governance services from home.What I would build for the community: if I could build something, I would build a clean public library with free Wi-Fi and a small community health centre, so that children can study and people can get quick medical help nearby. (Write your own example of infrastructure from your area and how it helped you.)
2. How does infrastructure like ports, highways, and airports create jobs in different parts of the country? Can you think of indirect ways people benefit from it?
ANSWERDirect jobs: building and running infrastructure needs many workers. Ports, highways and airports employ engineers, construction workers, drivers, pilots, ticket collectors, loaders, security staff, ground staff and maintenance teams. For example, Indian Railways alone is the largest employer with about 1.21 million employees, and these jobs are spread across many states.Indirect jobs and benefits: good infrastructure creates many more jobs around it. Near stations, ports and airports there are catering, vending, taxi and autorickshaw services, hotels, repair shops and small businesses. Highways help farmers like Satish take their crops to the mandi before they spoil, help factories get raw materials and send out finished goods, and let trucks carry products to distant markets. This boosts trade and tourism, raises incomes, and brings development to remote areas. So infrastructure benefits people not only directly through jobs but also indirectly by making businesses, farming and daily life easier and cheaper.
3. Why is it important to think about the environment when building new infrastructure like roads or airports? Can infrastructure development and environmental protection go hand in hand? If yes, how?
ANSWERWhy the environment matters: building roads, airports and other projects can cut down forests, disturb the habitats of animals and birds, cause pollution and harm biodiversity. If we ignore the environment, infrastructure can damage the very Nature on which people depend, and add to problems like dirty air and climate change.Yes, they can go hand in hand. Infrastructure can be built in a safe and sustainable way that protects the environment. For example: using solar panels to generate electricity for buildings reduces emissions; the Kempegowda International Airport in Bengaluru uses a ‘garden city’ design with bamboo structures, plants and green spaces; the Delhi Metro uses cleaner electricity and some solar power; railways using 75–90% less energy than road transport and shifting to electric trains reduces pollution; and alarm systems are used where animals cross railway tracks to protect wildlife. By choosing clean energy, environment-friendly materials and careful design, development and environmental protection can grow together.
4. How can better infrastructure (like roads, airports, communication systems) help during natural disasters like floods or earthquakes?
ANSWERBetter infrastructure is very useful during natural disasters because it helps rescue and relief reach people quickly and keeps them connected.Roads and bridges let rescue teams, ambulances and trucks carrying food, water and medicines reach affected areas. For example, the Dhola Sadiya Bridge gives year-round travel across the Lohit River, so people can reach hospitals and markets even during floods, unlike earlier when they had to depend on ferries.Air transport is the fastest way to deliver aid and can reach difficult terrains like high mountains, deserts, dense forests and flooded regions where roads are cut off; cargo flights move perishable and life-saving goods like vaccines and medicines.Communication systems help send quick SMS alerts and use apps to warn people in advance, locate those who are stranded, and coordinate the relief work. Together, good infrastructure saves lives and reduces suffering during emergencies.
5. Have you ever noticed people misusing public spaces, like scribbling on walls, breaking streetlights, or damaging benches? What are its consequences? Write your observations and suggest solutions to prevent it.
ANSWERThis is an observation activity; write what you have actually seen. A model answer with observations and solutions:Observations: I have seen people scribbling and writing on walls and monuments, throwing litter on roads, breaking streetlights and damaging park benches and bus-stop shelters.Consequences: such damage to public infrastructure reduces ease of living for everyone. Broken streetlights make roads unsafe at night, dirty and damaged public places look ugly and spread disease, and repairing them again and again becomes a burden on every citizen because public money is wasted.Solutions: taking care of public infrastructure is a collective responsibility. We should use public property responsibly, never write on or damage it, throw waste only in dustbins, and report damage like potholes or broken streetlights to the authorities. Schools and communities can spread awareness through posters and a ‘Community Responsibility Pact’, and the government can impose fines on those who damage public property. (Add your own observations and solutions.)
6. Prepare ‘scenario posters’ for the following situations:
• A new factory is planned in an area. What form of infrastructure is required for its smooth operation?
• Self-cleaning roads, underground highways, and high-speed bullet trains could be part of a futuristic city! Imagine the kind of infrastructure that would be required in the future that could help ease the lives of the people and communities in your city, town or village for various day-to-day functions.
• Think about upgrades to the infrastructure near you, considering the terrain of your area, such as coastal, mountainous, plains, etc., and the type of natural calamities your region is prone to.
• If you could design a new railway or metro station, what would it look like and what features would you add to make it more fun and comfortable for the passengers?
ANSWERThis is a creative poster activity. Make your posters using drawings and short labels; the ideas below can guide you.(i) Infrastructure for a new factory: good roads and highways to bring raw materials and send out finished goods; a railway siding or nearby railway station and ports for bulk transport; a steady electricity supply (and solar power) and a water pipeline; communication networks and internet; warehouses and cold storage; and housing, schools and a health centre for the workers nearby.(ii) A futuristic city: self-cleaning solar roads, underground highways to free up surface space, high-speed bullet trains and driverless electric buses, smart traffic signals, free public Wi-Fi, rooftop solar panels and rainwater harvesting, automated waste management, and green parks — all designed to be clean, fast and eco-friendly.(iii) Upgrades suited to your terrain: in coastal areas — strong sea walls, cyclone shelters, good drainage and early-warning systems against cyclones and floods. In mountainous areas — tunnels, sturdy bridges, landslide barriers and all-weather roads. In the plains — flood embankments, better drainage and wide highways. Choose the calamity your region faces (flood, cyclone, earthquake, drought) and add suitable safety features.(iv) A new railway or metro station: clean, well-lit and airy, with ramps, lifts and railings for the elderly and disabled; clear digital display boards and announcements; comfortable seating, free drinking water and clean toilets; free Wi-Fi and charging points; small shops, a library corner and play area; solar panels on the roof, rainwater harvesting and plenty of plants; and alarm or safety systems to keep passengers safe. (Draw your own design and label the features.)
7. Today’s modern infrastructure requires consistent technological innovations. For instance, electric vehicles are increasingly being used by people as a cheaper alternative to polluting fuel like diesel or petrol. Find out about other innovations in infrastructure that can improve ease of living or mobility for communities.
ANSWERThis is a ‘find out’ activity; collect examples from your reading, news and discussions with elders. Besides electric vehicles, several innovations are improving ease of living and mobility:Transport innovations: electric and solar-powered buses and trains, the Vande Bharat semi-high-speed trains, metro networks in 23 cities, EV charging stations, and bicycle-sharing schemes. India aims to run trains fully on electricity, which is cleaner and cheaper.Energy and building innovations: solar parks and rooftop solar panels, wind farms (like Muppandal in Tamil Nadu), LED street lighting, green ‘garden city’ airports, and rainwater harvesting.Communication and smart innovations: high-speed 5G internet, cloud and AI-driven services, e-governance apps like DigiLocker, online payments and e-commerce, smart traffic signals and CCTV, and apps that send disaster alerts. These innovations make daily life safer, faster, cheaper and more convenient for communities. (Add more examples that you find.)
Extra Practice Questions
Short Answer Type Questions
Q1. What is physical infrastructure? Give two examples.
ANSWERPhysical infrastructure is the vast network of tangible (physical) structures built to keep our cities and villages functioning, such as transport systems, utilities, communication networks and energy projects. Examples include roads and bridges, and electricity and water pipelines.
Q2. Who builds and maintains national highways and expressways in India?
ANSWERNational highways and expressways are built and maintained by the central government. They are like super-fast roads that join cities across states and connect with railway stations, airports and ports so that goods and people can travel smoothly. State highways, in contrast, are maintained by states through their public works departments.
Q3. What is the Golden Quadrilateral?
ANSWERThe Golden Quadrilateral is an important highway network connecting four of India’s major cities — Delhi, Mumbai, Chennai and Kolkata. It helps people and goods move quickly between these large cities.
Q4. Why did the British introduce railways in India in 1853?
ANSWERThe British introduced railways in India in 1853 mainly to transport raw materials like cotton and tea to ports for export to Britain, and to move British goods across India to create a market for them. Railways also allowed the exploitation of resources and quicker movement of troops, helping the British keep tighter control over India.
Q5. What is e-governance? Give one example.
ANSWERE-governance is the use of communication technologies by the government to deliver services to citizens, such as applying for documents, filing complaints or getting information online. One example is the DigiLocker app, which lets people store documents like the Aadhaar card and driving licence online.
Long Answer Type Questions
Q1. Describe the different modes of transportation infrastructure in India.
ANSWERTransportation infrastructure enables the mobility of people and goods, and India uses several modes. Roads and highways: India has the second-largest road network in the world, including local roads, state highways, and national highways and expressways; bridges and tunnels, such as the Dhola Sadiya Bridge in Assam, help cross difficult terrains. Railways: introduced in 1853, Indian Railways today carries over 20 million passengers daily, is one of the cheapest train services in the world, and is the fourth-largest railway system globally. Metro trains run in 23 cities over more than 1,000 km, offering fast, reliable and cleaner travel that reduces road traffic. Air transport is the fastest mode, connecting people and moving high-value or perishable cargo; India had 159 airports in 2025. Shipping and ports: India’s coastline of about 11,100 km, with 12 major ports and 217 minor ports, supports cheap transport of heavy goods and trade with West Asia, Africa and Europe. Together, these modes connect places of origin to markets and boost the economy.
Q2. How has communication infrastructure improved the quality of life in India?
ANSWERCommunication infrastructure — cables, wireless devices, towers, satellites and data centres — lets us transmit messages, images and videos quickly, and has greatly improved ease of living. A simple voice note from a village in Madhya Pradesh to a cousin in Tamil Nadu travels through mobile towers, fibre cables, satellites and giant servers in seconds. Through these advancements, students can access online classes, digital libraries and educational videos even in remote areas. Communication aids emergency response during disasters through quick SMS alerts and apps. Small and large businesses sell products across the world through e-commerce, people make quick online payments, and citizens use e-governance to apply for documents, file complaints or get information easily. In the 1990s, mobile calls could cost up to ₹17 per minute, but today India has some of the world’s cheapest mobile and internet rates, with over 1,160 million wireless subscribers and nearly 900 million internet connections in 2025. All this has made life faster, easier and more connected.
Q3. Why is taking care of public infrastructure a collective responsibility? What should citizens and the government do?
ANSWERAlthough India has developed major infrastructure like airports and highways, problems still remain — roads are littered, buildings are stained and monuments are written on. Such damage to public infrastructure reduces ease of living for everyone and becomes a burden for every citizen because public money must be spent again on repairs. That is why caring for it is a collective responsibility. Citizens should use infrastructure responsibly, never damage it, keep it clean, and report problems like potholes or broken streetlights to the authorities. The government should improve Panchayat and municipal services for waste management, sewer systems, traffic management, clean drinking water and footpaths, and can impose penalties to deter damage — just as Kautilya’s Arthaśāstra long ago laid down road rules and fines for damaging waterworks and parks. Together with safe and sustainable design that uses clean energy and considers children, the elderly and the disabled, this shared effort keeps infrastructure useful for all.
MCQs & Assertion–Reason
1. The vast network of tangible structures that keeps cities and villages functioning is called:
(a) social infrastructure (b) physical infrastructure (c) e-governance (d) e-commerce
2. India has the second-largest road network in the world, after:
(a) China (b) Russia (c) the United States of America (d) Canada
3. NH44, the longest national highway in India, runs from:
(a) Mumbai to Chennai (b) Srinagar to Kanyakumari (c) Delhi to Kolkata (d) Leh to Goa
4. The Golden Quadrilateral connects which four cities?
For each Assertion–Reason question, choose: (A) Both true and the Reason correctly explains the Assertion; (B) Both true but the Reason is not the correct explanation; (C) Assertion true, Reason false; (D) Assertion false, Reason true.
A-R 1. Assertion: Good roads and bridges help during natural disasters like floods.
Reason: They allow rescue teams, ambulances and trucks carrying relief to reach affected areas quickly.
A-R 2. Assertion: The British built railways in India mainly to help Indian farmers and traders.
Reason: Railways were introduced in 1853 to transport raw materials to ports for export to Britain and to move troops and goods for British control.
A-R 3. Assertion: Metro trains help reduce pollution in cities.
Reason: Metro trains run on cleaner fuels like electricity, and some even use solar power.
A-R 4. Assertion: Taking care of public infrastructure is a collective responsibility.
Reason: Damage to public infrastructure reduces ease of living and becomes a burden for every citizen.
A-R 5. Assertion: Cargo trains are more harmful to the environment than road transport.
Reason: Cargo trains use 75–90 per cent less energy than road transport.
Answer key: 1-(A), 2-(D), 3-(A), 4-(A), 5-(D).
Exam Tips & Common Mistakes
How to score full marks in this chapter
Remember the difference between physical infrastructure (roads, railways, power, water, communication) and social infrastructure (schools, hospitals, parks). Learn the five modes of transport — roads, railways, metro, air, and shipping/ports — with one fact each (e.g., India has the second-largest road network; railways began in 1853; metros run in 23 cities; 12 major ports). Use the textbook’s real examples — NH44, the Golden Quadrilateral, Dhola Sadiya Bridge, Chenab Rail Bridge, Atal Setu, J.C. Bose, DigiLocker and the Arthaśāstra — to make answers richer. For ‘benefit’ questions, mention both direct and indirect jobs, and always connect good infrastructure to better quality of life.
Common mistakes to avoid
Confusing physical infrastructure with social infrastructure — schools and hospitals are social infrastructure.
Mixing up who builds roads — state highways are maintained by states, national highways and expressways by the central government.
Mixing up e-governance (government services online, e.g. DigiLocker) with e-commerce (buying and selling online).
Forgetting that the British built railways for their own benefit, not for India’s.
Saying trains pollute more than roads — trains actually use 75–90% less energy than road transport.
Leaving activity questions (Q1, Q5, Q6, Q7) blank — give your own examples from your area.
Frequently Asked Questions
What is Chapter 19 of Class 7 Social Science Exploring Society about?
Chapter 19, Infrastructure: Engine of India’s Development, explains what physical infrastructure is, surveys India’s transport networks (roads, railways, metro, air, shipping and ports) and communications infrastructure, highlights scientist J.C. Bose, and stresses that maintaining public infrastructure through sustainable, eco-friendly design is a collective responsibility.
What is the difference between physical and social infrastructure?
Physical infrastructure is the network of tangible structures like roads, bridges, railways, electricity, water pipelines and communication networks. Social infrastructure includes facilities such as schools, colleges, hospitals, health centres, police stations, courts, parks and libraries that support the wellbeing and development of communities.
What is the exercise heading for Chapter 19 of Exploring Society Part 2?
The end-of-chapter exercise in Exploring Society: India and Beyond (Part 2) Chapter 19 is headed Questions and activities and contains 7 questions, all answered step by step on this page.
