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प्रश्न
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?
उत्तर
(a) (i) P is a CFL (Compact Fluorescent Lamp), and (ii) Q is a filament type bulb.
(b) Filament is present in a bulb, not in CFL.
(c) Energy C is heat energy.
(d) P is more energy efficient.
(e) Coal will be conserved if all of us switch over to devices like P (CFL). This is because it is used in generating electricity.
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संबंधित प्रश्न
Process of separation of different constituents from petroleum is called ______.
Explain the process of formation of petroleum.
Name two fossil fuels.
Name a clean gaseous fuel other than LPG and natural gas.
Fill in the following blanks with suitable words :
LPG is a ........... fuel but biogas is not a..........fuel.
The poisonous gas which reduces the oxygen-carrying capacity of blood to a large extent is :
(a) SO2
(b) NO
(c) CO
(d) CO2
Write two disadvantages of burning fossil fuels.
What is known as destructive distillation? Write about the products obtained from fractional distillation of petroleum.
Fill in the blanks in the following sentence.
Petroleum, ______ and ______ are fossil fuels.
Write some important uses of the various constituents of petroleum.
