Energy

1 Marks Question

1. What is an alternative source of energy?
2. The sources of energy which are developed to reduce the load on non-renewable sources of energy are called the alternative source of energy. for example wind energy, biomass energy, tidal energy etc.
3. Write any two examples of bio-fuel.
4. Any two examples of bio-fuel are gobar gas, fire cake.
5. Write two examples of non-renewable source of energy.
6. Two examples of non-renewable sources of energy are coal, and mineral oil.
7. Write two examples of biomass.
8. Two examples of biomass are straw, animal dung.
9. Name the highest quality of coal.
10. Anthracite is the highest quality of coal.
    More info: Lignite is the lowest quality of coal.
11. Give two examples of renewable source of energy.
12. Examples of renewable sources of energy are solar energy, tidal energy, etc.
13. What is geo-thermal energy?
14. Geothermal energy is the energy that can be obtained from the heat present inside the earth.
15. Define nuclear reaction that takes place in the Sun.
16. When two or more light hydrogen atoms combine to form heavy helium atoms under high pressure and temperature, a large amount of energy is released in the form of heat and light. This process is called a nuclear reaction that takes place in the Sun.
17. Define renewable source of energy.
18. The sources of energy which are inexhaustible and can be replaced as they have been used up are called the renewable source of energy.
19. What is energy crisis?
20. The future scarcity of energy sources on the earth due to overpopulation, unmanaged urbanization and industrialization is called the energy crisis.
21. What is the estimated temperature of the outer surface of sun?
22. The estimated temperature of the outer surface of sun is 5700°C.
23. Define fossil fuel.
24. Fossils like coal and petroleum burnt to produce heat are fossils fuel. It is not environment friendly.
25. What is non-renewable energy source?
26. The sources of energy which are depleted or exhausted after a certain period of time if they are used continuously are called non-renewable energy source.
27. What is hydropower?
28. Hydropower power is the power derived from the energy of falling or fast-running water which is used to produce electricity.
29. Write any two condition required in the sun for nuclear fusion reaction.
30. Any two condition required in the sun for nuclear fusion reaction are listed below:
    1. Presence of sufficient amount of hydrogen.
    2. High temperature to produce free hydrogen protons.
31. Write the name of any two radioactive elements.
32. The radioactive elements are uranium, radium.
33. What amount of average solar energy does the earth surface receive per square meter?
34. Average solar energy received by the earth surface per square meter is 1.4 KW/m² per second.
35. Write a major disadvantage of fossil fuel.
36. Major disadvantage of fossil fuel are listed below:
    1. Fossil fuels release carbon dioxide when they burn, which adds to the greenhouse effect and increases global warming.
    2. It is non-renewable source of energy and unsustainable, it pollutes the environment.
    More info: It contribute to public health issues negatively, these compounds lead to many serious side effects, such as acid rain and respiratory damage in humans.
37. Write any two natural phenomena from which geothermal energy can be obtained.
38. Any two natural phenomena from which geothermal energy can be obtained are:
    1. Volcanoes are one of the most common natural geothermal energy sources.
    2. Different geochemical reaction in the ocean water also creates geothermal energy.
39. What is bio-fuel?
40. The fuel obtained from waste materials of living organisms and dead parts of plants like cattle dung, wood, straw etc. is called bio-fuel.
41. What is the source of solar energy?
42. The main source of solar energy is the Sun.