Que 1:- True or False
1) The first tools used by humans made out of metal
Answer:- False
2) The first metal to be discovered was copper.
Answer:- True.
3) One of the important inventions that contributed to the industrial revolution was the stea engine.
Answer:- True.
4) it was possible to mark tools hard enough to cut trees, after the metal bronze was discovered.
Answer:- False.
Que 2) Give one word for
1) A device that makes a task easier
Answer:- Machine
2) Production of goods especially in factories
Answer:- Industry.
3) A machine that produces electricity.
Answer:- Generator
4) Electricity produced by using the force of flowing water as in dams
Answer:- hydroelectricity.
Que 3) Answer in short
1) which was the first metal to be discovered?
Answer:- Copper was the first metal to be discovered.
2) how did the discovery of copper benefit humans?
Answer :- The discovery of this metal helped in the making of stronger and sharper tools.
Que 4 Give reason
1) the discovery of iron is considered to be very important in the history of humans
Answer:- Iron is a very hard metal . Thus this can be used to make strong tools and weapons.
2) During the Industrial revolution cities became bigger.
Answer:- People from villages and nearby areas settles down in the cities to work in these factories. So, cities became larger and more populated.
Que :- Answer in brief
1) What is hydroelectricity ? what force is used to generate hydroelectricity?
Answer:-
- Hydroelectricity in the generation of electricity from water.
- The force of flowing water in rivers is controlled
- And is made use to generate this kind of electricity.
2) What are the problems in using fuels such as coal and petroleum as sources of energy ? How can these problems be solved ?
Answer:-
- Coal and petroleum ate fuels thar are commonly used to day
- But burning these fuels leads to pollution of air, water and land.
- Alternate fuel like solar energy, wind energy and energy from water which do not pollute the environment.
Que:- Answer in detail.
1) what do you mean by Industrial Revolution?
Answer:-
- Earlier goods were made by hand by the people in their houses, using simple tools.
- With the invention of the large steam driven machines, goods could be produced in large quantities with cheaper prices and letter qualities.
- This led to the beginning of the big factory system using larger machines.
- Lots of people from villages came to working these factories and the cities grew larger.
- The significant changed from hand made goods to machine made goods.
- This is known as the industrial Revolution.
2) what was the effect of the discovery f the steam engine on the industry at that time?
Answer:-
- Steam engine helped to run big machines.
- So, more and more factories came up.
- This helped in making more goods at much cheaper price.
- Till about 300 years ago, people used to power of their own muscles and animals.
- Ans they also used the force of wind and flowing water to do all the work.
- With the invention of the steam engine, they had a powerful force to run their machines.
Que :- 1) Short note
Iron :-
- This was an important discovery as iron was harder than copper and bronze.
- It was used to make much better tools and weapons
- Iron tools were used to cut down trees and clear forest for agriculture.
- Iron weapons made easier to hunt animals.
- The discovery of iron helped humans progress faster.
Que:- Define
1) Coal:-
Coal is obtained from mines and is also used in power plants to produce electricity.
2) Petroleum :-
This source of energy is found inside the earth we get fuels such as petrol , kerosene and diesel from it.