Last updated on February 9th, 2024 at 04:32 pm
CG Board Class 8 Science Sources of Energy Textbook Exercises which includes Fill in the blanks ,Question Answers and Extra Question and Answers from the Chapter.
Choose the correct alternative :-
(1) Out of these, this is a non renewable source of energy –
(a) Wind energy
(b) Petroleum [answer]
(c) Tidal energy
(d) Solar energy
(2) The fuel used in heavy vehicles as buses & trucks are –
(a) Tarpene
(b) Biogas
(c) Diesel [answer]
(d) Kerosene
(3) The energy converters in a solar cell is made of –
(a) Aluminium
(b) Carbon
(c) Plastic
(d) Silicon [answer]
(4) The energy received from the battery is :-
(a) Chemical energy
(b) Heat energy
(c) Electrical energy [answer]
(d) Mechanical energy
(5) It is not a product of petroleum :-
(a) Petrol
(b) Bio diesel [answer]
(c) Kerosene
(d) Diesel
Fill in the blanks :-
1. ………………. energy is mostly used in our homes.[Electrical]
2. Solar cooker is based on …………………. energy. [Solar]
3. Coal is a source of ………………….. energy. [Thermal]
4. Mixture of cowdung and water treated in special plant produce ………..[Biogas]
5. The liquid fuel in our homes is ……………………[LPG]
Match the following :-
| A | B |
| CNG | Natural gas |
| Sea | Tidal energy |
| Solar cooker | Solar energy |
| Wind Farm | Wind energy |
| Dams | Electrical Energy |
Answer the following questions in 3-4 lines :-
Q: Write names of four sources of energy.
Four sources of energy are:
a. Solar energy
b. Wind energy
c. Hydroelectric energy
d. Fossil fuels (e.g., coal, petroleum)
Q: What are the benefits of solar energy? Give two examples of its use in daily life.
A: Benefits of solar energy include being renewable, environmentally friendly, and cost-effective in the long run. Two examples of its use in daily life are solar panels on rooftops for electricity generation and solar water heaters for heating water.
Q: How is hydroelectricity produced? In Chhattisgarh where are the projects for hydroelectricty situated?
A: Hydroelectricity is produced by the force of flowing water turning turbines connected to generators. In Chhattisgarh, hydroelectricity projects are situated at Hasdev Bango and Gangrel dam projects.
Q: Write the names of the different products of petroleum.
A: Different products of petroleum include petrol (gasoline), diesel, kerosene, and petroleum gas (LPG).
Q: What is Biogas ? How is it produced?
A: Biogas is a mixture of gases, mainly methane and carbon dioxide, produced through the anaerobic decomposition of organic material like cow dung.
Q: List down the various sources of energy used in your surrounding and categorize them as renewable and non-renewable sources of energy ?
A: Various sources of energy used in the surroundings can be :
Renewable sources: Solar energy, wind energy, hydroelectric energy
Non-renewable sources: Fossil fuels (coal, petroleum)
Q: What are the main gases present in LPG?
A: The main gases present in LPG (Liquified Petroleum Gas) are butane, propane, and ethane.
Q: According to the available resources what kind of power station would you like to install in your area. Explain.
A: The choice of power station to install in the area will depend on the available resources, environmental impacts and energy requirements. If renewable resources such as wind or sunlight are in sufficient quantity, installing a wind or solar power station would be a sustainable option. The decision should be taken after considering local conditions and energy requirements.
CG Board Class 8 Science Sources of Energy Extra Question Answers
Q: How is electrical energy produced in dams?
A: Electrical energy in dams is produced by the force of flowing water turning turbines connected to generators.
