Question

1.What kind of mirror-concave, convex or plane-would be best suited for use in a solar cooker? Why?
2.What are the limitations of energy that can be obtained from the oceans?
3.What is geothermal energy?4.What are the advantages of nuclear energy?
5.Can any source of energy be pollution free? Why or why not?
6.Hydrogen has been used as a rocket fuel. Would you consider it a cleaner fuel than CNG?
7.Why or why not?
Name two energy sources that you would consider to be renewable. Give reasons for your choices
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Answer 1

Answer✍️✍️✍️

1. A concave mirror is best suited for use in a solar cooker. Because a concave mirror reflects and concentrates solar energy from over a large area into a small area.
2. There are very few sites around the world which are suitable for building tidal dams.The rise and fall of sea-water during high and low tides is not enough to generate electricity on a large scale and the cost of maintaining the dam is high.
3. Geothermal energy is heat derived from the earth . It is the thermal energy contained in the rock and fluids, that fill the fractures and pores in the rocks that form the earth's crust
4. The main advantages of Nuclear energy is that it produces no polluting gases and it does not contribute to global warming.
5. No source of energy can be perfectly pollution free but biomass energy, hydro electric energy, wind energy, geothermal energy and solar energy are almost pollution free.
6. Hydrogen is a cleaner fuel than CNG. Because it produces water on burning whereas CNG on burning produces CO2, though much less than that produced when coal or oil is burnt.
7. Solar energy and wind energy are the two sources of energy. Reasons:1) These sources are unlimited and they are never going to diminish.2)These sources are naturally replenishing

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