Access full and verified DAV Class 4 SST Chapter 5 Question Answer Bricks and Bridges from the DAV CMC textbook We and Our World. This guide includes complete explanations of bridge types (Suspension, Cantilever, Cable-stayed), construction materials, building techniques, and safety values.
A. Tick (✓) the correct option
1. Lokhan lives in the state of—
(a) Andhra Pradesh
(b) Arunachal Pradesh
(c) Uttar Pradesh
Answer: (b) Arunachal Pradesh
Reason: Lokhan lives in a village in Arunachal Pradesh where his father works at a construction site.
2. The material which helps in making a building strong—
(a) Straw
(b) Mud
(c) Cement
Answer: (c) Cement
Reason: Cement binds bricks, stone gravel, and steel bars together into concrete, making structures solid and durable.
3. Bridges help in the easy movement of—
(a) Vehicles
(b) Valley
(c) River
Answer: (a) Vehicles
Reason: Bridges span across rivers, valleys, and railways, allowing smooth flow of automobiles, trains, and pedestrians.
4. The house that uses strong material—
(a) Tree house
(b) Stilt house
(c) Apartment
Answer: (c) Apartment
Reason: High-rise apartments are permanent pucca structures built using reinforced cement, iron beams, and bricks.
B. Fill in the blanks
Help Box: kiln, strong, rope, construction, bamboo
1. Lokhan went to a construction site where his father works.
2. Bricks are made at a kiln.
3. Ayaan has never crossed a bamboo bridge.
4. The earlier Suspension Bridges were made of wood and rope.
5. The development in science and technology has enabled us to construct strong bridges.
C. Name the type of bridges as per the given clues
Across Clues:
1. Earlier, it was made up of wood and rope: Suspension Bridge
2. It uses short cables attached to pillars: Cable-stayed Bridge
Down Clues:
3. It uses truss formations below and above the bridge: Truss Bridge
4. It is built across a river: Bridge (or Beam Bridge)
D. Answer the following questions
Question 1: List the types of materials used in making a temporary house and a permanent house.
Answer: Here is the list of materials used for both types of houses:
| Type of House | Materials Used |
|---|---|
| Temporary House (Kutcha House) | Mud, bamboo, dry grass, straw, thatch, wood, canvas, and plastic sheets. |
| Permanent House (Pucca House) | Burnt bricks, cement, iron and steel rods, concrete, stone chips, marble, glass, and timber. |
Question 2: Write two benefits of modern building materials.
Answer: Two key advantages of modern construction materials are:
1. Strength & Durability: Structures made of concrete, steel, and burnt bricks withstand harsh weather, floods, and earthquakes for decades.
2. Safety & Capacity: They permit the construction of massive multi-storey residential towers and long bridges that house and transport millions safely.
Question 3: What is a bridge? How is it useful?
Answer: A bridge is a structure built across an obstacle such as a river, railway line, deep valley, or canal to provide continuous passage over it.
Usefulness: Bridges connect isolated places, reduce travel time significantly, allow heavy commercial vehicles to carry goods across geographical barriers, and ensure safe transit without ferries or boats.
Question 4: Briefly explain any two types of bridges.
Answer:
1. Suspension Bridge: In a suspension bridge, the roadway is hung by vertical suspenders from huge steel cables anchored to strong towers at each end. Example: Lakshman Jhula in Rishikesh, Golden Gate Bridge in USA.
2. Cantilever Bridge: A cantilever bridge is supported by horizontal beams (cantilevers) that project outward from supports and join in the middle without central pillars. Example: Howrah Bridge in Kolkata.
Question 5: Highlight the differences between the lives of Lokhan and Ayaan.
Answer:
• Lokhan: Lives in a rural village in Arunachal Pradesh in a simple stilt bamboo house. He walks across a narrow swinging bamboo bridge to go to school, and his father is a construction laborer.
• Ayaan: Lives in a metropolitan city in a multistoried concrete apartment with all modern amenities. He travels along flyovers, broad concrete roads, and modern bridges.
Value-Based Question
Value-Based Reflection (Safety on Work Sites): Situation: A Mall is being constructed in Mumbai. People are working day and night to complete the project. Viren, an electrician, was standing on an iron ladder with bare feet. While working, he got an electric shock.
1. What precautions Viren could have taken before starting his work?
Answer: Viren should have switched off the main electrical supply before touching wires, worn rubber-soled insulated safety shoes and dry rubber gloves, and used a wooden or fiberglass ladder instead of a metal iron ladder.
2. What should you do in such an emergency?
Answer: In an electrical shock emergency:
• Turn off the main circuit breaker immediately.
• If you cannot reach the switch, use a dry wooden stick or broom handle to push the live wire or victim away without touching them directly.
• Call an ambulance and emergency medical personnel right away.
3. What is the importance of awareness and responsibility in performance of our duties?
Answer: Safety awareness prevents deadly accidents and protects lives. Being responsible ensures workers strictly follow safety guidelines, keeping both themselves and co-workers safe from workplace hazards.
Map Skill
Mark the States where the following Bridges are located on a Political Map of India:
1. Lakshman Jhula: Uttarakhand (across River Ganga at Rishikesh)
2. Howrah Bridge (Rabindra Setu): West Bengal (across River Hooghly at Kolkata)
3. Golden Bridge: Gujarat (across River Narmada at Bharuch)
4. Bandra-Worli Sea Link: Maharashtra (in Mumbai)
🎉 Chapter 5 Completed!
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