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प्रश्न
What are fossil fuels?
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उत्तर
Fuels formed in the geological past from the remains of living organisms and plants etc. Examples of fossil fuels are coal, petroleum, and natural gas, etc.
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संबंधित प्रश्न
"The calorific value of cooking gas (LPG) is 50 kJ/g". What does it mean?
Define ignition temperature of a fuel.
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.
Name two sources of energy which you consider to be non-renewable. Give reason for your choice.
Which of the following is not a renewable source of energy?
(a) wind
(b) flowing water
(c) fossil fuels
(d) fuel wood
Which of the following fuels has the highest calorific value?
(a) natural gas
(b) methane gas
(c) hydrogen gas
(d) biogas
The fuel having the lowest calorific value is:
(a) coal
(b) wood
(c) charcoal
(d) kerosene
Name any one hydrocarbon fraction obtained during the fractional distillation of petroleum which is used as a domestic fuel.
Which fossil fuels were formed by the buried remains of small plants and animals?
The main constituent of petroleum gas is:
(a) methane
(b) ethane
(c) butane
(d) propane
The natural gas consists mainly of:
(a) methane
(b) ethane
(c) propane
(d) butane
A substance X is added to LPG cylinders while filling so as to make the detection of leakage of LPG from the cylinder easy.
Name the substance X.
Suggest a safe and efficient method for the disposal of biowastes and sewage materials. How is this method advantageous to us?
Fill in the blank
Solar cells use the power supplied by the ______.
Choose the correct answer.
The coal that has the highest percentage of carbon is
State whether the following is True or False.
Coal and petroleum are renewable energy resources.
Name a few major producers of petroleum in the world.
Which part of the solar cooker is responsible for greenhouse effect?
Make a list of conventional and non-conventional sources of energy. Give a brief description of harnessing one nonconventional source 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.
