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Long Questions (8 marks each)
1. Define work and its unit. Describe the conditions for maximum and minimum work.
2. What is kinetic energy? Derive its expression by using graphical analysis.
3. What is potential energy? What are its different types? Show that gravitational potential energy is equal to the product of mass 'm', gravitational field strength 'g' and height 'h'.
4. What is meant by energy conversion and energy conservation?
5. Describe how useful energy may be obtained from natural resources.
6. Differentiate between renewable and non-renewable energy sources with examples. Write down advantages and disadvantages of each in reference to their availability and environmental impact.
7. Describe the processes by which energy is converted from one form to another with reference to fossil fuel energy, hydroelectric generation, solar energy, nuclear energy, geothermal energy, wind energy and biomass energy.
8. Describe the process of electricity generation by drawing a block diagram of the process from fossil fuel input to electricity output.
9. Define power. What is the relation of its SI unit with horse power?
10. What is efficiency? Why is it important for cars or electronic devices to be designed with high efficiency? Why can the efficiency of machines never be unity or 100%?
11. Explain by drawing energy flow diagrams through steady-state systems such as a filament lamp, a power station, and a vehicle traveling at a constant speed on a level road.