Sources of energy Worksheets

Sources of energy Worksheet-10

1. What is greenhouse effect?

2. Name the gaseous fuel, out of the following which has the highest calorific value :

Hydrogen, Methane, LPG, Biogas

3. Why CNG is considered an environmental friendly fuel?

4. Name a fraction obtained during refining of petroleum which is not used as a fuel.

5. Which of the following gases is a major constituent of biogas: Carbon monoxide, hydrogen, methane, carbon dioxide?

Sources of energy Worksheet-11

1. How were fossil fuels formed? How these fossil fuels were made?

2. Name the places of our Country where fields of natural gas are found. Why is it called a clean fuel? Give two reasons.

3. Define the term 'fuel'. What are primary and secondary fuels? To which class of fuel do the following belong :

Coke, Wood, Petroleum, LPG.

4. 48 kJ of energy is produced per minute in a nuclear reactor. Calculate the number of fissions which would be taking place in the reactor per second, if the energy released per fission is 3.2 × 10^–11 J.

Sources of energy Worksheet-12

1. How many groups of nuclei are generated in the fission of  ²³⁵U ? What are their characteristics ? Explain briefly the terms (i) prompt (ii) delayed, and (iii) spontaneous fission.

2. Write the four processes that can take place, after neutrons are emitted in a fission reaction. Which of these processes will cause the fission to continue? How is the energy of released neutrons lowered from 2 MeV to 0.025 MeV?