Q. Why back tube of solar water heater is surrounded with a vaccum?

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Q. In solar home system, an estemates of 15 to 75 watt energy gained by

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Q. In 1998, total installed world capacity of PV increased, approximately

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Q. In USA, solar thermal installations provide over 350 MW for

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Q. 'CCS' stands for

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Q. PV solar cells make better contribution in

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Q. By 2000, japan had installed a capacity of about

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Q. Solar energy gain through windows and roof are known as:

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Q. In gas turbine, If maximum temperature of a thermal cycle raises

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Q. Hybrid electrical vehicals has an efficiency of about:

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Q. Energy efficiency of coal-fired power station has been improved, approximately

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Q. Ethanol is produced from

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Q. British Petroleum' has set up a carbon emission

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Q. CHP' stands for

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Q. In which sector 'GHGs' emisions are growing rapidly?

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Q. What is responsible for about one-quarter of greenhouse gases emissions?

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Q. Road transport accounts 80 percent of greenhouse gases (GHGs) emission in

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Q. Since 1970, USA number of motor vehicles has grown at average rate of

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Q. Air transport is growing even faster than

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Q. Air transport accounts 13% GHGs in

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