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प्रश्न
Describe the four major types of coal.
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उत्तर
Depending on the carbon content, there are four types of coal: Arundeep’s Self-Help to Voyage-7
(a) Anthracite is the best quality of coal since it has almost 90% carbon.
(b) Bituminous coal is the second-best coal with 65% to 70% carbon.
(c) Lignite is poor quality coal with a carbon content of around 60%.
(d) Peat has very little carbon, is not fully formed, and gives little heat and a lot of smoke on burning.
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संबंधित प्रश्न
Classify the following into renewable and non-renewable sources of energy:
Coal, Wind, Tides, Petroleum,Wood, Natural gas
Which of the following is not a renewable source of energy?
(a) wind
(b) flowing water
(c) fossil fuels
(d) fuel wood
Name the component which is found in natural gas well as in biogas.
Why is the leakage of LPG detected easily although it is odourless? State the steps to be taken in case its leakage is detected in the kitchen.
The energy in petrol originally came from the sun. Explain how it got into petrol.
The pollution of air caused by burning petroleum fuels (like petrol and diesel) in vehicles can be controlled by fitting a device X in the exhaust system of vehicles.
Name the device
State whether the following statement is true or false:
Tidal energy is one of the forms in which solar energy manifests itself in oceans.
Why is biogas considered an ideal fuel for domestic use?
Write any two advantages of using biogas.
The constituent of biogas which makes it an excellent fuel is:
(a) butane
(b) methane
(c) propane
(d) ethane
One of the following is not required in the formation of biogas in a biogas plant. This is:
(a) cow-dung
(b) water
(c) oxygen
(d) anaerobic bacteria
The source of energy of the sun is:
(a) conversion of hydrogen gas into helium
(b) conversion of carbon fuel into carbon dioxide
(c) burning of hydrogen gas present in the sun
(d) disintegration of uranium into barium and krypton
Select the renewable and non-renewable sources of energy from the following :
- Coal
- Wood
- Water
- Diesel
- Wind
- Oil
Why is the use of wood as a fuel not advisable although wood is a renewable source of energy?
Fill in the blank
Coal, petroleum, and natural gas are _________fuels.
Name a few major producers of petroleum in the world.
Choose the incorrect statement regarding wind power
Fill in the blanks and complete the story.
About 300 million years ago, the earth had dense ______ in low lying wetland areas. Due to natural processes like ______, these forests got buried under the ______. As more ______ deposited over them, they were compressed. The ______ also rose as they sank deeper and deeper. Under high ______ and high ______, dead plants got slowly converted into coal.
Imagine that all the exhaustible natural resources are exhausted by human activities. Do you think survival of living beings would be possible? If yes, why? If not, why not?
