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प्रश्न
Explain why is it no wise to regard wood as a renewable sources of energy.
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उत्तर
Use of wood is a renewable source but is not advised to use, because saplings take a long time to become a tree.
संबंधित प्रश्न
"The calorific value of cooking gas (LPG) is 50 kJ/g". What does it mean?
An examples of a renewable source of energy is:
(a) petrol
(b) natural gas
(c) biogas
(d) kerosene
The calorific values of three fuels A, B and C are 33 kJ/g, 48 kJ/g and 150 kJ/g, respectively. A is solid, B is liquid and C is a gas at room temperature. One combustion, both A and B produce carbon dioxide while C explodes forming steam. B and C leave no residue after combustion while A leaves behind some solid residue. Which one of the three fuels is the most ideal? Give two reasons to support your answer.
A substance X is added to LPG cylinders while filling so as to make the detection of leakage of LPG from the cylinder easy.
How does substance X make the detection of leakage of LPG easy?
Name the original source of wind energy.
What are the raw materials used for making biogas?
What is meant by the renewable and non-renewable sources of energy? State two differences between them, giving two examples of each
State whether the following is True or False.
Coal takes millions of years to form.
Can you tell?
What is ‘green energy’?
Write True/False against the following statement.
Resources which are present in unlimited quantity in nature are called exhaustible natural resources.
