Page 82 - SST Class 05

locomotive : a railway engine.
division of labour : a system in which different workers do different things in an industry.

Facts

• Tools and machines have made our life comfortable.
• The present age is called the Machine Age because of abundant use of machines in all fields of life.
• Copper is believed to be the first metal found by man.
• The Bronze Age was an important milestone before the Iron Age ushered.
• The Industrial Revolution started in the eighteenth century with the invention of the steam engine,
and led to mass production, factory system and division of labour.
• The invention of the steam engine was an important step in the progress of the Industrial
Revolution.
• The steam engine found application in several other fields.

XERCISE

A. Tick (3) the right option :
1. The earliest tool was made by man from ____________ .
(a) stone (b) copper (c) iron
2. An alloy is a mixture of ____________ .
(a) juices (b) metals (c) oils

3. The present age is called the Iron Age because iron is used ____________ .
(a) in everything (b) abundantly (c) in nothing
4. The Industrial Revolution led to ____________ .
(a) mass production (b) division of labour (c) both of these
B. Answer the questions briefly :
1. How do tools and machines help us in our work?

2. How can we call the present age as the Machine Age?
3. What do you understand by the Bronze Age?
4. Why did iron replace other metals in making tools and machines?
5. How did the steam engine strengthen the Industrial Revolution?

Machines and You

v Visit the kitchen with your mother. Now, find out which tools and machines she uses for the
following tasks :
• To peel potatoes : ________________________ • To microwave foods : ________________________
• To clean water : ________________________ • To boil rice : ________________________

• To make milk-shake : ________________________ • To throw out smoke : ________________________
And now tell which tools you use to eat noodles : ________________________________________________

82 Contemporary Social Science-5