1. Which force is responsible for stability of our universe?
1. Name one fuel used in nuclear reactor. (CBSE CCE 2012)
2. Name the reaction responsible for large energy production in the sun. (CBSE CCE 2012)
3. How has the traditional use of wind energy been modified for our convenience? (AI 2008C)
4. Biogas is considered to be a boon to the farmers. Give reasons. (CBSE CCE 2011)
5. What is a solar cell panel? Mention any three of its applications? (CBSE CCE 2012)
6. Why are many thermal plants set up near coal or oil fields? (AI 2008C)
7. Distinguish between renewable and non-renewable resources of energy. Also give examples (CBSE CCE 2011)
8. What is geothermal energy? What are the advantages of wind energy? (CBSE CCE 2011)
9. Name the device used to convert
a. Solar energy into heat
b. Solar energy into electricity (DELHI 2006C)
10. Write the principle of generation of electric power by a boiling water type nuclear reactor. Name the coolant used in such a reactor. (DELHI 2005C)
11. a. name four gases which are mainly present in biogas.
b. List two advantages of using biogas over fossil fuels. (AI 2006C)
12. List any three hazards of nuclear waste. How does the disposal of nuclear waste pose a problem for the plant and animal life? (CBSE CCE 2012)
Answers
- gravitational force
- reaction between helium and hydrogen
- it is very good source and free to environment and eco friendly
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1. gravitational force
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The gravitational force is responsible for the stability of the universe.
2.uranium
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3.The kinetic energy of wind was traditionally used to do mechanical work like pulling water from a well or lifting. Nowadays, we can generate electricity using windmills. Nowadays, hydroelectric power stations are built to make use of the energy of water to generate electricity
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4.Biogas is considered to be a boon to the farmers because: Farmers can produce clean domestic fuel from the wastes like animal dung, dry leaves, dry plants, etc. Spent slurry can be used in the fields as manure to increase the fertility of the soil.
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5.Solar panels convert light energy to heat energy with the help of sunlight. They are highly efficient and renewable sources of energy. Applications: Calculators.
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6.Thermal power plants required coal and oil, which they burn to generate the required power. Since transmission of electricity is more efficient than transporting coal or oil over the same distance, it is logical to set up thermal power plants near coal or oil fields.
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7.Renewable resources are solar energy, wind energy, geothermal energy, biofuels, cultivated plants, biomass, air, water and soil. In contrast, non-renewable resources are those that are available to us in limited quantities, or those that are renewed so slowly that the rate at which they are consumed is too fast.
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8.Geothermal energy is renewable energy because once water or steam is used, it can be pumped back into the ground. It is also clean energy. Geothermal power plants, unlike plants that burn fossil fuels, do not produce greenhouse gases that can be harmful to the atmosphere.
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9. Solar cooker
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10.[electron]) is carried out in the core which is used to heat the water and convert it into steam. The steam is used directly to run a turbine after which is it condensed and converted back to water. The water is again returned to the core to complete the process. A BWR uses demineralised water as coolant.
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11 a)methane , carbon dioxide , hydrogen sulphide and ammonia
b) 1)Fossil fuels are renewable sources of energy which are fast depleting.
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ii) Biogas produces much lesser pollution or exhaust gases as compared to fossil fuels on burning. Hence it is a much cleaner fuel.
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12.Nuclear waste pose a problem for plant and animal life when disposed 'cause Nuclear Wastes can lead to the spread of Nuclear Radiations around the area where they are dumped and can even lead to the death of plants and animals of that particular area