4. Answer the following questions in 50-70 words.
a) What are the various ways of conservation of mineral resources?
b) How is biogas fuel generated?
c) Write a short note on hydel power.
Please answer fast... plz..
Answers
a)
1. Use of minerals in a planned and sustainable manner.
2. Recycling of metals.
3. Use of alternative renewable substitutes.
4. Technology should be improved to use the low grade ores profitably.
5. Use of alternative sources of power such as solar and wind energy.
6. Plant trees to prevent soil erosion.
7. Practicing of judicious ways to conserve water in our homes.
8. Use pipelines to transport oil.
9.Growing of vegetation in catchment areas.
10. Follow the 3R's - Reduce, Reuse and Recycle.
b)
Biogas is an energy-rich gas produced by anaerobic decomposition or thermochemical conversion of biomass. Biogas is composed mostly of methane (CH4), the same compound in natural gas, and carbon dioxide (CO2). The methane content of raw (untreated) biogas may vary from 40%–60%, with CO2 making up most of the remainder along with small amounts of water vapor and other gases. Biogas can be burned directly as a fuel or treated to remove the CO2 and other gases for use just like natural gas. Treated biogas may be called renewable natural gas or biomethane.
c)
The energy in the flowing water can be used to produce electricity. Waves result from the interaction of the wind with the surface of the sea and represent a transfer of energy from the wind to the sea. Energy can be extracted from tides by creating a reservoir or basin behind a barrage and then passing tidal waters through turbines in the barrage to generate electricity.
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