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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 good fuel is one which possesses:
(a) high calorific value and low ignition temperature
(b) high calorific value and high ignition temperature
(c) high calorific value and moderate ignition temperature
(d) low calorific value and moderate ignition temperature
The fuel having the lowest calorific value is:
(a) coal
(b) wood
(c) charcoal
(d) kerosene
Most of the fuels contain carbon as one of the constituents. Name a fuel which has very high calorific value but not contain carbon.
Name any four fractions obtained from petroleum which are used as fuels.
Explain why, natural gas is considered to be a good fuel.
What is meant by conventional sources of energy? Write the names of two conventional sources of energy.
Which fossil fuels were formed by the buried remains of small plants and animals?
The aviation fuel which is used in the engines of jet aeroplanes is:
(a) diesel
(b) kerosene
(c) petrol
(d) CNG
Name the constituents of biogas.
Which of the following is needed for the formation of biogas from cow-dung and which not?
Water, Oxygen
Write any two advantages of using biogas.
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
An energy efficient devices for producing light is:
(a) DLF
(b) CFL
(c) FCL
(d) LPG
State whether the following is True or False.
Coal takes millions of years to form.
What do you know about wind energy?
Explain why is it no wise to regard wood as a renewable sources of energy.
Why are fossil fuels called non-renewable sources of energy?
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.
Various materials which are obtained from nature are called natural resources. Which of the following is not a natural resource?
The underlined word in the following sentence have been jumbled up. Write them in their correct form.
Nutsgilh is an example of inexhaustible natural resources.
