Enjoy with Social Life-5 [106-136] - School Books Publishers India

C. Match the following :
1. James Watt (a) Electricity
2. Gottlieb Daimler (b) Railway engine
3. Volta (c) Steam engine
4. Franklin (d) Battery
5. George Stephenson (e) Petrol powered machine
D. Answer the following :
1. Which was the first metal that man discovered How did it prove
beneficial for him
Ans. Copper was the first metal that man discovered. He used it to make
tools and utensils which were useful in forming the land and hunting
the animals.
2. What is an alloy How did man prepare it
Ans. A mixture of two metals is called an alloy. Man began to mix copper
with zinc and tin to make new alloys like brass and bronze.
3. How did the invention of steam engine prove to be a blessing
Ans. The power of steam engine was also used to run different types of
machines. It increased productivity, reduced costs and improved
quality. It was much more profitable. It was so successful that it
became a model for the later inventions in steal locomotives.
4. What is industrial revolution
Ans. The change from hand made goods to machine made goods is known
as the industrial revolution.
5. How is water power produced
Ans. When the water falls from a great height of a dam, water power is
produced. It is called hydel power or hydro electricity.
6. What is fuel
Ans. The material such as coal, gas or oil that is burned to produce heat or
power is known as fuel.
Project/Activity :
E. Draw pictures of various sources of energy on a chart.
Ans. Do yourself.
F. Visit a gobar gas plant and find out how is it useful to the farmers.
Ans. Do yourself.
15. Some People Live Forever
Exercise
A. Write True or False :
1. Abraham Lincoln was the President of the United Kingdom. True
2. Mahatma Gandhi was born on October 2, 1969. False
3. Gandhiji's struggle was based on violence. False
4. Martin Luther King followed the path of non-violence. True
5. Martin Luther King was awarded Nobel Prize for peace. True
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