SOMETHING TO KNOW
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(✔)
2. The material which helps in making a building strong-
(a) Straw
(b) Mud
(c) Cement (✔)
Answer – (c) Cement (✔)
3. Bridges help in the easy movement of-
(a) Vehicles (✔)
(b) Valley
(c) River
Answer – (a) Vehicles (✔)
4. The house that uses strong material-
(a) Tree house
(b) Stilt house
(c) Apartment (✔)
Answer -(c) Apartment (✔)
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 →
1. Earlier, it was made up of wood and rope.
2. It uses short cables attached to pillars.
Down↓
3. It uses truss formations below and above the bridge.
4. It is built across a river.
D. Answer the following questions:
1. List the types of materials used in making a temporary house and a permanent house.
Answer – Temporary house – Mud, straw, bamboo, wood etc.
Permanent house – cement, bricks, iron rods, stones etc.
2. Write two benefits of modern building materials.
Answer – Two benefits of modern building materials are –
It makes the building strong and safe.
It does need early repairing.
3. What is a bridge? How is it useful?
Answer – A bridge is a structure build over an over space without blocking the way underneath. It helps in easy movement of people and goods from one side to another.
4. Briefly explain any two types of bridges.
Answer – Suspension bridge – It can cover a long distance. The earlier suspensions bridges are made of wood now they are made of steel.
Cable stayed bridge – It uses short cable that are attached to pillars.
Eg. lakshman Jhula on river Ganga in Rishikesh Uttrakhand.
5. Highlight the differences between the lives of Lokhan and Ayaan.
Answer – Lokhan
He lives in a village.
His father is a helper.
He is not aware of latest technology.
Ayaan
Lives in a city.
His father is a manager.
He is aware of latest technology.
VALUE BASED QUESTION:
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 – Before starting the works, he needs to wear his slippers.
2. What should you do in such an emergency?
Answer – We need to separate the person from the current source immediately.
3. What is the importance of awareness and responsibility in performance of our duties?
Answer – Awareness help to gain knowledge due to which we perform our duties perfectly.
Map Skill
On a political map of India, mark the states where the following bridges are located:
Lakshman Jhula – Uttrakhand
Howrah Bridge – West Bengal
Golden Bridge – Tamilnadu
Bandra Sea Link Bridge – Maharashtra
SOMETHING TO DO
1. Delhi Metro Rail Corporation is working on extending the metro rail network across the city of Delhi. List the people involved in making a metro bridge.
(a) Engineer
(b) Mason
(c) Labourer
(d) Electrician
(e) Supervisor
(f) Crane operator
(g) Safety officer
(h) Architecture
2. Identify the types of bridges:
3. Look at some pictures of tools. Name any four tools used by a carpenter, painter, tailor, electrician, mason and plumber.
4. Which type of bridges should be constructed at the following places and why?
Type of bridge
(a) Between mountains – Suspension bridge – because it is easy to made and lasts long.
(b) Across a river – Arch bridge and Truss bridge- because the structures of these bridges are compatible with the flow of river water.
(d) To ease road traffic – Flyovers – because it helps to accommodate many vehicles at a time for hassle free commuting.