Advertisements
Advertisements
प्रश्न
Choose the correct answer.
The coal that has the highest percentage of carbon is
विकल्प
anthracite
bituminous
lignite
peat
Advertisements
उत्तर
The coal that has the highest percentage of carbon is anthracite
APPEARS IN
संबंधित प्रश्न
Give the names of two energy sources that you would consider to be exhaustible. Give reasons for your choices.
Which of the following fuels has the highest calorific value?
(a) natural gas
(b) methane gas
(c) hydrogen gas
(d) biogas
State two important uses of natural gas
State one important use of CNG these days.
Explain how, sun is considered to be the ultimate source of fossil fuels
Which of the following is not a fossil source of energy?
(a) kerosene oil
(b) cow-dung cakes
(c) CNG
(d) coal
A substance X is added to LPG cylinders while filling so as to make the detection of leakage of LPG from the cylinder easy.
How does substance X make the detection of leakage of LPG easy?
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?
Fill in the following blank with suitable word:
Biomass is another form in which ........... energy manifests itself.
Which of the following sources of energy are not derived from the sun?
Biomass, Wind, Ocean thermal energy, Geothermal energy, Nuclear fuels, Hydroelectricity, Wave energy, Coal, Petroleum, Tidal energy
An energy efficient devices for producing light is:
(a) DLF
(b) CFL
(c) FCL
(d) LPG
Can you tell?
Which forms of energy from the sun are used in solar energy devices?
Name the major constituent of natural gas.
Which of the following is a non-renewable source of energy?
The major problem in harnessing nuclear energy is how to ______.
Various materials which are obtained from nature are called natural resources. Which of the following is not a natural resource?
Exhaustible natural resources are
Fill in the blanks and complete the story.
About 300 million years ago, the earth had dense ______ in low lying wetland areas. Due to natural processes like ______, these forests got buried under the ______. As more ______ deposited over them, they were compressed. The ______ also rose as they sank deeper and deeper. Under high ______ and high ______, dead plants got slowly converted into coal.
Why petrol is exhaustible natural resource, whereas sunlight is not? Explain.
