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What is the main component of LPG?

Important Questions on Coal and Petroleum

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The solar constant at a place is 1.4 kw/m2. The solar energy received by an area of 4 m2 per second at this place is: 
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In a Solar Furnace, sunlight is concentrated at the ________ of the concave mirror.

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Which of the following is a major constitute of Bio-gas?
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What are the limitations in harnessing wind energy?

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Which of the following is the main component of petroleum gas?
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Plane mirror reflector is used inside the solar cooker box. Explain why.

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Which of the following cells is being used in the communication satellite.
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Name the two devices that work using heat energy of the sun.
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Which of the following variety of coal contains the highest percentage of carbon? 
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Which of the following is not an example of a biomass energy source?
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Nowadays bio-diesel is used in transportation vehicles as an alternate to diesel. Write two advantages of this measure.
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Which of the following is not an example of a bio-mass energy source?
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Label 1 and 2 in the given figure.

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Consider the following statements and choose the correct alternative.

Statement - I : Heating capacity of biogas is more than that of biomass.

Statement - II : Biogas produces lesser pollution as compared to biomass.

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Name the major constituent of biogas. Write the properties of biogas which make it a good fuel.
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Solar energy is treated as the energy source of the future. Write any two solar devices working on solar energy that can be utilised in daily life.
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Explain the working of a solar water heater with the help of a labelled diagram.
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The main constituent of bio-gas is 
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Which of the following is not an example of a bio-mass energy source?
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Main component of LPG is