Chapter Questions
What is the source of heat on the surface of the sun?
The S.I. unit of calorific value is _____
Several solar cells when connected in series and parallel form a _____
What is the chief source of energy for all natural activities?
Define ignition temperature.
The fuel used as aviation fuel in jet aeroplanes is a special grade of _____
What is the principle behind a solar power plant?
Name any two materials that are used for making solar cells.
Nearly $30 \%$ of sunlight consists of _____ rays that produce heating effect.
What is solar energy?
What are combustible and non-combustible materials?
A device which converts solar energy into electrical energy is _____
What are the types of sources of energy?
What is nuclear fission?
_____is left behind as a residue, when wood is burnt in a limited supply of oxygen.
What is combustion?
What is petroleum? What is natural gas?
The difference between the output energy and the input energy is termed as _____
What is destructive distillation?
What are fossil fuels?
_____metal is used in connecting wires that connect solar cells in a solar panel.
What are the types of fuels?
What is a hydroelectric power plant?
Energy sources that can be replenished, once they are used up, are called _____
Between petrol and kerosene, which has a high calorific value?
What is a windmill?
The type of coal containing the lowest percentage of carbon is _____
Define calorific value.
What is a solar cell?
The heat that we feel in the sunlight is due to _____
How can wind energy be converted to electrical energy?
Write a short note on various types of fuels (with reference to their physical presence).
Give the characteristics of sources of energy.
Explain the production of geothermal electricity.
Write a short note on natural gas.
What are the different types of sources of energy? Give two examples for each.
What is a calorific value? Which gaseous substance has the highest calorific value?
Explain the construction of a fixed dome type biogas plant,
What are the types of fuels? Give two examples for each.
Give the differences between box type and reflector type solar cookers.
What are the limitations of a hydroelectric power plant?
How is petroleum formed? How is it extracted?
What are the various factors to be considered in choosing a fuel?
What are the limitations of harnessing wind energy?
Explain the construction of reflector type solar cooker.
What is a biogas plant? Explain the construction and working of a biogas plant.
Explain how various petroleum products are obtained from crude oil,
"Solar energy is the chief source for all other forms of energy". Explain.
How is coal formed? What are the different types of it?
Explain the principle, construction and working of a windmill.