CBSE Pathshala

Short Answer Type Questions (2 marks each) Q. 1. List four gases generated in a biogas plant Ans. (i) Hydrogen (ii) Hydrogen sulphide (iii) Methane (iv) Carbon dioxide. Q. 2. Name the major constituent of biogas. List three characteristics to prove it as an excellent fuel. Ans. Methane is the major constituent of biogas. Three characteristics to prove it as an excellent fuel : (i) Smokeless (ii) Leaves no residue (iii) Higher heat of combustion. Q. 3. Mention the main use of slurry left behind in the biogas of plant. State the characteristics of the slurry on which this use is based. Ans: Slurry is used as a manure as it is rich in nitrogen and phosphorus. Q.4. List any four reasons why we need to look for alternate sources of energy. Ans: Four reasons we need to look for alienate sources of energy are : (a) Pollution due to fossil fuels. (b) Exhausting fuel reserves.(c) Increasing need. (d) Replenishment is not easy. Q.5. List any four qualities of an ideal so...

JSUNIL TUTORIAL,SAMASTIPUR CBSE X Physics Assignment/Worksheet-Chapter: Sources of Energy 1. What is energy? 2. What do you mean by ‘source of energy’? 3. What should be the characteristics of a source of energy? 4. Name a few sources of energy used in our daily life. 5. What are renewable and non-renewable sources of energy? Give examples of each. 6. Name some of the sources of energy used in ancient times. 7. Give two advantages and 2 disadvantages, each of renewable and non-renewable sources of energy. 8. What are fossil fuels? Give a few examples. 9. Name a gaseous fossil fuel. 10. Which of the following is not derived from solar energy: - geothermal, wind energy, fossil fuels, Biomass. 11. What are the limitations of extracting energy from (a) the wind (b) the waves (c) the tides? 12. What are the environmental consequences of the increasing demand for energy? What steps would you s...

X Physics Ch- Sources of Energy – Extra scoring Notes Part -1  Energy is the capacity of a body for doing work . We have a wide range of sources of energy such as the sun, the wind, the earth geothermal), flowing water, coal, gasoline, diesel, natural gas, biogas, etc. at our disposal. There are two types of sources of energy: Renewable sources of energy (or non-conventional sources of energy ): The sources of energy which are in constant supply to us by nature and are inexhaustible are known as renewable sources of energy. Example : The sun (solar energy), oceans, tidal energy, wind energy, running water energy, wood, geothermal energy etc. (ii) Non- renewable sources of energy (or conventional sources of energy ): The sources which cannot used again and again and are exhaustible are known as non-renewable sources of energy. Example: Coal, natural gas, petroleum, fossil fuels etc. A good fuel: (a)Low ignition temperature (ii) having high calorific value (iii) Produce ...

SHORT QUESTIONS WITH ANSWERS (3 MARKS) Q.1. How many groups of nuclei are generated in the fission of  235  U? what are their characteristics? Explain briefly the terms  (i) prompt (ii) delayed, and  (iii) spontaneous fission. Ans.  Two groups of nuclei are generated in the fission of  235  U (i)One of these groups is a heavy group of nuclei with mass numbers ranging from 130 to 149,e.g., Barium and Lanthanum. (ii)The other groups are a lighter group of nuclei with mass numbers ranging from 85 to104, e.g., Krypton and Molybdenum. (iii)In prompt fission, the heavy nucleus disintegrates the moment it is bombarded. (iv)In delayed fission, a projectile (e.g., neutron) enters the target nucleus and causes an instability which results in the fission of the target nucleus after a short while. (v) Spontaneous fission is just out of the nature of the element. Q.2. Write the four processes that can take place, after neutrons are emitted in a fission reaction...