Class 6 science unit 8 exercise question answer 7-11|| oxford secondary science book 1

Subject: General Science Book: Oxford Secondary Science 1 Unit:8 (Energy) Topic: Exercise Q/A Page no: 93 1.     Make a table with four columns had them things with chemical energy things with kinetic energy things with potential energy things with heat and light energy filling the table with as many examples of each as you can. 2.     In machines energy is often wasted because of friction what forms does this wasted energy take? 3.     Which disadvantage of fossil fuels is also a problem when biomass is burned as a fuel? 4.     Coal and oil are important energy sources describe how energy from the sun became stored in coal or oil? 5.     Why is it important to find new ways of generating electricity? 6.     Skipp 7.     Write down as many energy changes as you can think of which take place at a fun fair? 8.     List six ways to save energy in the home. 9.     Heat is a form of energy. What is the difference between heat and temperature? 10. What energy changes are taking place when,                   I.          You talk on the telephone,              II.          Use a solar powered calculator,            III.          A wind turbine spins and provide electricity,            IV.          A skydiver jumps out of a plane.   11. What kind of energy do th following have? An aircraft in flight a slice of bread a bungee jumper about to jump off a bridge a car at the top of a rollercoaster 12. If you drop a plate on the floor, what energy changes take place? 13. Water at the top of a hill has potential energy. Where and how does the water gets its potential energy? 14. What are the advantages and disadvantages of building wind faion land and on offshore? 15. Make a list of as many ways you can think of, in which energy is used in a large office block. 16. It is often said that biomass is a renewable fuel but not a clean one. Explain what this statement means. 17. What renewable sources of energy would be most suitable for your school? 18. The sun is our main source of energy. Can you name three sources of energy which do not come, directly or indirectly, from the sun? 19. Apart from causing congestion, what other problems do cars cause, particularly in cities?