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प्रश्न
Fill in the blank
_______is the coal with the highest percentage of coal.
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उत्तर
Anthracite is coal with the highest percentage of coal.
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संबंधित प्रश्न
A non-renewable source of energy is:
(a) wood
(b) alcohol
(c) hydrogen gas
(d) natural gas
The fuel having the lowest calorific value is:
(a) coal
(b) wood
(c) charcoal
(d) kerosene
The calorific values of three fuels A, B and C are 33 kJ/g, 48 kJ/g and 150 kJ/g, respectively. A is solid, B is liquid and C is a gas at room temperature. One combustion, both A and B produce carbon dioxide while C explodes forming steam. B and C leave no residue after combustion while A leaves behind some solid residue. Which one of the three fuels is the most ideal? Give two reasons to support your answer.
Complete the following sentence:
Domestic gas cylinders like Indane contain mainly ..............
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.
How does this device help in controlling air pollution?
Name the original source of wind energy.
Compare and contrast biomass and hydroelectricity as sources of energy.
Most of the sources of energy that we sue represent stored solar energy. Which of the following is not ultimately derived from the sun's energy?
(a) wind energy
(b) geothermal energy
(c) fossil fuels
(d) biomass
How long are the energy resources of the earth like coal, petroleum and natural gas expected to last?
The world's known coal reserves are expected to last for about:
(a) 200 years
(b) 400 years
(c) 500 years
(d) 100 years
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.
Choose the correct answer.
The coal that has the highest percentage of carbon is
Name a few major producers of petroleum in the world.
Give an account of the use of solar energy.
Can you tell?
Why should we maximise the use of non-conventional energy resources?
Name two forms of sea energy.
Tidal energy is ______ type of energy.
Which among the following is the non-renewable resources?
Various materials which are obtained from nature are called natural resources. Which of the following is not a natural resource?
Sunlight and air are inexhaustible natural resources. Comment.
