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प्रश्न
Which fossil fuel is conserved when we save on electricity?
उत्तर
Coal is conserved when we save electricity.
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संबंधित प्रश्न
Explain the process of formation of petroleum.
Why are coal and petroleum categorised as natural resources? Give a reason as to why they should be used judiciously.
Name a clean gaseous fuel other than LPG and natural gas.
A man bought a device X which could cook pulses, vegetables and rice without using any fuel like wood, coal, kerosene or LPG, etc. This device did not work at night. It also took a lot of time for cooking.
(a) Name the device X.
(b) What is the source of energy which cooks food in this device?
(c) What is the name of the process which traps energy in this device?
(d) State one advantage (other than saving on fuel) or using such a device for cooking food.
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?
List the products of combustion of fossil fuels. What are their adverse effects on the environment?
Petroleum was formed from organisms
Fill in the blanks in the following sentence.
Petroleum, ______ and ______ are fossil fuels.
We say fossil fuels will last only for a few hundred years. Comment.
We read in newspapers that burning of fuels is a major cause of global warming. Explain why.
