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प्रश्न
Which of the two is more energy efficient: filament type electric bulb or CFL? Why?
उत्तर
A compact fluorescent lamp (CFL) is more energy efficient, because it consumes much less electrical energy than a filament-type electric bulb.
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संबंधित प्रश्न
What are the disadvantages of fossil fuels?
Fill in the following blank with a suitable word:
The amount of heat produce by burning a unit mass of a fuel completely is known as its ............ value.
LPG consists mainly of:
(a) butane
(b) ethane
(c) butanone
(d) methane
Fill in the following blank with suitable word:
Biomass is another form in which ........... energy manifests itself.
What are the raw materials used for making biogas?
What are fossil fuels?
Acid rain happens because ______.
What is non-renewable resources?
Look at figure where petroleum and natural gas deposits are shown. Why do we find oil layer above water layer?
Complete the crossword in figure with the help of the clues :
Across
1. Fuels obtained from dead remains of living organisms. (6, 5)
2. A process by which the various constituents of petroleum are separated. (8)
3. A porous black substance obtained from coal. (4)
4. Another name for motor fuel. (6)
Down
5. The substance obtained by carbonisation. (4)
6. Fuel for heavy motor vehicles. (6)
7. A petroleum product used for road surfacing. (7)
8. Dead remains of sea animals got converted into it. (9)
