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प्रश्न
Coal and petroleum are formed from the dead remains of organisms and are known as ______.
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उत्तर
Coal and petroleum are formed from the dead remains of organisms and are known as fossil fuels.
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संबंधित प्रश्न
Kerosene is not a fossil fuel.
Fill in the following blanks with suitable words :
LPG is a ........... fuel but biogas is not a..........fuel.
Why should fossil fuels like coal and petroleum be used judiciously?
There are two important fuels A and B both of which are extracted from deep inside the earth. Fuel A is a thick, dark, foul smelling liquid whereas fuel B is a black solid. Combustion of both the fuels produces products, C, D, E and F. The product C makes the rainwater only slightly acidic but it is mainly responsible for causing global warming. The product D is neither acidic nor basic. It is harmless and does not affect the environment in any way. Both E and F attack breathing system of humans and are mainly responsible for causing acid rain. In addition to combustion of fuels A and B, the product F is also formed when lightning occurs in the sky.
(a) What are (i) fuel A, and (ii) fuel B?
(b) Name (i) C (ii) D (iii) E, and (iv) F
(c) What is the process of formation of F during lightning known as?
(d) Which fuel is supposed to be exhausted sooner : A or B?
(e) Which fuel is mostly used for generating electricity at thermal power plants?
A person buys two electrical devices P and Q for lighting purposes in his house. The device P consumes only 5 units of electricity in a month but device Q consumes 15 units of electricity in a month when used for the same number of hours daily. The device Q wastes a lot of electricity by radiating energy C but P does not do so.
(a) What type of device is (i) P, and (ii) Q?
(b) Name one component which is present in Q but not in P.
(c) Name the energy C.
(d) Which device is more energy efficient : P or Q?
(e) Which fossil fuel is most likely to be conserved if all of us switch over to devices like P?
Write an answer to the following question in your own words.
Make a list of the components we obtain from mineral oil.
Match the following.
| Octane rating | Diesel |
| Cetane rating | Methane |
| Simplest hydrocarbon | Petrol |
| Peat | Bown in colour |
| Lignite | First stage coal |
Name the petroleum product used as fuel for stoves, lamps and jet aircrafts.
The underlined word in the following sentence have been jumbled up. Write them in their correct form.
Umpetlore is a fossil fuel.
Write some important uses of the various constituents of petroleum.
