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प्रश्न
What are fossil fuels?
उत्तर
Fuels formed in the geological past from the remains of living organisms and plants etc. Examples of fossil fuels are coal, petroleum, and natural gas, etc.
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संबंधित प्रश्न
What is meant by a non-renewable source of energy? Give two examples of non-renewable source of energy.
Calorific value and ignition temperature of fuel X are 75 kJ/g and 20°C respectively. These values for fuel Y are 50 kj/g and 75°C respectively. On burning, the fuel Y produces only CO2while fuel X produces CO2 and CO. Which of the two is a better fuel? Give two reasons to support your answer.
What is meant by conventional sources of energy? Write the names of two conventional sources of energy.
Describe how fossil fuels were formed.
The main constituent of petroleum gas is:
(a) methane
(b) ethane
(c) butane
(d) propane
The aviation fuel which is used in the engines of jet aeroplanes is:
(a) diesel
(b) kerosene
(c) petrol
(d) CNG
The ultimate source of energy stored in fossil fuels is:
(a) moon
(b) earth
(c) sun
(d) sea
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(a) kerosene oil
(b) cow-dung cakes
(c) CNG
(d) coal
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(a) coal gas
(b) electricity
(c) oil
(d) charcoal
What should be the minimum wind speed for the satisfactory working of a wind-powered electric generator?
Apart from cattle dung, what other substances can be added to a biogas plant?
Name the biomass which is still widely used as a source of heat energy in many household of our country.
The fossil fuel whose known reserves in the earth are expected to last for the minimum period is:
(a) coal
(b) uranium
(c) petroleum
(d) natural gas
You have three unlabelled test tubes containing ethanol, ethanoic acid and soap solution. Explain the method you would use to identify the compounds in different test tubes by chemical tests using litmus paper and sodium metal.
What are non-renewable resources of energy? Give two examples of such resources.
Fill in the blank
Solar cells use the power supplied by the ______.
Can you tell?
What are the non-conventional energy resources?
Why should we conserve the non-renewable sources of energy?
Why are fossil fuels called non-renewable sources of energy?
Write True/False against the following statement.
Wildlife is an exhaustible natural resource.
