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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
Which of the following fuels has the highest calorific value?
(a) natural gas
(b) methane gas
(c) hydrogen gas
(d) biogas
Calorific value and ignition temperature of fuel X are 75 kJ/g and 20°C respectively. These values for fuel Y are 50 kj/g and 75°C respectively. On burning, the fuel Y produces only CO2while fuel X produces CO2 and CO. Which of the two is a better fuel? Give two reasons to support your answer.
Name any four fractions obtained from petroleum which are used as fuels.
The main constituent of petroleum gas is:
(a) methane
(b) ethane
(c) butane
(d) propane
Which of the following is needed for the formation of biogas from cow-dung and which not?
Water, Oxygen
What are the raw materials used for making biogas?
The fuel which is not obtained from biomass is:
(a) firewood
(b) cow-dung cakes
(c) coke
(d) charcoal
A certain form of energy is available due to the difference in the temperature of water at the surface of the ocean and its deeper levels.
(a) Name the form of energy.
(b) Is this energy ultimately derived from the sun or not?
(c) Explain how this form of energy can be converted into electricity.
(d) What is the minimum temperature difference in water at the surface of ocean and its deeper level which is required to operate power plants based on is energy?
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.
What are non-renewable resources of energy? Give two examples of such resources.
Choose the correct answer.
The coal that has the highest percentage of carbon is
State whether the following is True or False.
The Sardar Sarovar Dam is built on the river Narmada.
Explain why is it no wise to regard wood as a renewable sources of energy.
Acid rain happens because ______.
Which among the following is the non-renewable resources?
Choose the incorrect statement regarding wind power
What are the environmental consequences of using fossil fuels? Suggest the steps to minimise the pollution caused by various sources of energy including non-conventional sources of energy.
Match the items given in Column I with the items of Column II.
| Column I | Column II |
| (a) Used for road surfacing | (i) Black gold |
| (b) Natural gas | (ii) Vaseline and candles |
| (c) Petroleum | (iii) Bitumen |
| (d) Paraffin wax | (iv) CNG |
