Advertisements
Advertisements
प्रश्न
Coal is said to be formed from the wood of trees. Why then is coal considered to be a non-renewable source of energy whereas wood is a renewable source of energy?
उत्तर
Coal is classified as a non-renewable source of energy because, when trees die and are buried in the earth, they take many years to decompose and form coal. So, they are not easily available. But wood will continue to be available to us if we use it properly as per a plan.
APPEARS IN
संबंधित प्रश्न
Name two sources of energy that you think are renewable. Give reason for your choice.
Name two sources of energy which you consider to be non-renewable. Give reason for your choice.
Which of the following is not produced by the burning of fossil fuels?
(a) nitrogen oxides
(b) sulphur oxides
(c) sodium oxides
(d) carbon oxides
A certain form of energy is available due to the difference in the temperature of water at the surface of the ocean and its deeper levels.
(a) Name the form of energy.
(b) Is this energy ultimately derived from the sun or not?
(c) Explain how this form of energy can be converted into electricity.
(d) What is the minimum temperature difference in water at the surface of ocean and its deeper level which is required to operate power plants based on is energy?
Answer the following question.
Write the name of the main constituent of Biogas. Also, state its percentage.
Fill in the blank
Solar cells use the power supplied by the ______.
Fill in the blank
_______is the coal with the highest percentage of coal.
Choose the correct answer.
Windmills have been used for many centuries in
Choose the correct answer.
The coal that has the highest percentage of carbon is
State whether the following is True or False.
The Sardar Sarovar Dam is built on the river Narmada.
