CBSE Board Students Helpline

http://cbseguess2010.blogspot.com http://sciencehelpline.blogspot.com http://pschelpline.blogspot.com Chapter 14 : Sources of Energy 1. What is that energy called, which is derived f rom the heat inside the earth? (1mark) 2. What do you mean by O. T.E? (1mark) 3. Write down the name of any one source of energy which is not derived directly or indirectly from solar energy. (1mark) 4. Define a nuclear fusion reaction. Describe the conditions for the occurrence of a nuclear fusion reaction. (2marks) 5. Give an ex ample of a nuclear fusion reaction. Describe one method for making such reactions possible. (2marks) 6. Distinguish between renewable and a non-renewable source of energy. (2 marks) 7. What are the adv antages of bio-gas over th e traditional fuels? (2marks) 8. Explain the working of a wind mill. (2marks) 9. Wh y it is not possible to make use of solar cell to meet all our energy needs? State two reasons to support your answer. (2marks) 10. (i)What is bio-gas? How can bio-gas be ...