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प्रश्न
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.
उत्तर
(a) Device X is a solar cooker.
(b) Solar energy is the source of energy that cooks food in this device.
(c) Greenhouse effect is the process that traps energy in this device.
(d) The advantage of this technique is that it does not cause any pollution or harm to the environment.
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संबंधित प्रश्न
Process of separation of different constituents from petroleum is called ______.
Why are coal and petroleum categorised as natural resources? Give a reason as to why they should be used judiciously.
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(a) SO2
(b) NO
(c) CO
(d) CO2
Which of the following combination of terms has no fossil fuel?
(a) wind, ocean, coke
(b) kerosene, tide, wind
(c) wood, wind, sun
(d) petrol, wood, sun
List the products of combustion of fossil fuels. What are their adverse effects on the environment?
What are fossil fuels?
The term petroleum means ________
Crude oil is used as a sealant for waterproofing various surfaces.
Give reason for the following:
Petroleum is considered a harmful source of energy.
