Sources of Energy Worksheet for Grade 7 with Solved
Sources of Energy Worksheet for Grade 7: Sources of Energy Worksheet for Grade 7 students with solution in this page. Students of Standard 7 who are already cleared concept on Sources of Energy can solve this paper.
Q1) What are the two types of energy resources?
Ans. Renewable and Non renewable resources of energy.
Q2) What is renewable sources? Example
Ans. Renewable sources are sources which are reproduced within a short time. Eg. Sun, wind and biomass.
Q3) What is non renewable sources? Example
Ans. Non renewable sources are sources which are not reproduced after use. Eg. Coal, natural gas and nuclear power.
Renewable sources
Q1) What does solar power give us?
Ans. solar power give us heat and light.
Q2) Why heaters are used?
Ans. Heaters are used to boil water for bathing.
Q3) What are solar cells?
Ans. solar cells are used to produce electricity to artificial satellites.
Q4) Mention two disadvantage of solar energy
Wind energy
Q1) What is wind?
Ans. Movement of air is called wind.
Q2) How ancient people use wind energy
Ans. ancient people use wind energy by cleaning paddy, grinding grain and transportation of sail boats.
Q3) What is advantage and disadvantage of wind power
Ans. The advantage of wind power does not cause air pollution. The disadvantage of wind power is found in limited areas.
Geothermal energy
Q1) What is geothermal energy
Ans. Thermal energy is generated and stored in the earth is called geothermal energy.
Q2) What is magma?
Ans. Hot and molten rocks is called magma.
Q3) What is advantage of geothermal energy?
Ans. It is used in the deep earth crust.
The energy of flowing water
Q1) How ancient people use flowing water?
Ans. ancient people use flowing water to rotate turbines.
Q2) What is hydropower station?
Ans. A place where electricity is generated using water is called hydropower station.
Q3) How dynamo produce electricity?
Ans. Dynamo produce electricity by rotating turbines.
Energy of biomass
Q1) What is biomass?
Ans. Biomass is a type of energy which is stored in animal and plants material s
Q2) Write example of biomass?
Ans. Firewood
Q3) In what way dung is used in India?
Ans In india cow dung is used to prepare food.
Non renewable sources
Q1) what is mineral oil?
Ans. Mineral oil is a fossil fuel which is used in factories and transportation.
Q2) What is the advantage of mineral oil?
Ans. Mineral oil is easy to handle and converted to energy by modern machines easily.
Q3) What is the disadvantage of mineral oil?
Ans. limited supply of mineral oil.
Coal
Q1) Where coal is found?
Ans. Coal is found among the inner rock layers of the earth.
Q2) How coal caused environment pollution?
Natural gas
Q1) What are natural gas?
Ans The methane gas have trapped within the rock of the earth surface.
Q2) What is the use of natural gas?
Ans. The use of natural gasTo cook food in cold countries and also to heat houses.
Q3) What is the advantage of natural gas?
Ans. Natural gas is easy to use and cheap.
Nuclear power
Q1) How nuclear energy is generated?
Ans. Energy is generated in the sun by nuclear reactions.
Q2) What is the advantage of nuclear energy?
Ans. Very little amount of radioactive atoms such as uranium, plutonium helps in generating vast energy.
Q3) What is the dis advantage of nuclear energy?
Ans. High expenditure for installation and maintenance of nuclear power plants.
Q4) What is the disadvantage of radioactive substances?
Ans. Radioactive substances are toxic which are harmful to individuals.
Q5) Name two nuclear plant?
Ans. 1) Explosion at the Chernobyl nuclear plant in Russia
2) Explosion at Fukushima nuclear plant in Japan
Sustainable usage of energy sources
Q1) Mention four strategies for maintaining of Sustainable usage of energy sources?
Ans. The four strategy for maintaining of Sustainable usage of energy sources are as follows
1.) Avoid busy hours for travelling.
2.) Minimise using domestic electricity
3.) Fix catalytic converter to vehicles
4.) Walk or use a bicycle for shorter distances.