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प्रश्न
Fill in the blank
Coal, petroleum, and natural gas are _________fuels.
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उत्तर
Coal, petroleum, and natural gas are fossil fuels.
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संबंधित प्रश्न
On what basis would you classify energy sources as
(a) renewable and non-renewable?
(b) exhaustible and inexhaustible?
Are the options given in (a) and (b) the same?
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.
What is the composition of liquefied petroleum gas (LPG)?
What is the main constituent of:
(1) petroleum gas?
(2) natural gas?
State one important use of CNG these days.
What is meant by conventional sources of energy? Write the names of two conventional sources of energy.
Describe how fossil fuels were formed.
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?
State whether the following statement is true or false:
Tidal energy is one of the forms in which solar energy manifests itself in oceans.
Compare and contrast biomass and hydroelectricity as sources of energy.
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?
Which produced of the nuclear fission of uranium-235 is utilised to cause further fission of its nuclei?
Renewable source of energy is :
Choose the correct answer.
Windmills have been used for many centuries in
What is the main difference between renewable and non-renewable energy resources?
Can you tell?
Why should we maximise the use of non-conventional energy resources?
Why is charcoal considered better fuel than wood?
Various materials which are obtained from nature are called natural resources. Which of the following is not a natural resource?
Air is a natural resource and cannot be exhausted by human activities. It is known as inexhaustible natural resource. Which of the following is another inexhaustible natural resource?
Exhaustible natural resources are
