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Science as requested in detail. [5 marks ]

Coal and Petroleum · MP Board (MPBSE) STD 8 (Madhya Pradesh - English Medium). 5 questions.

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as requested in detail. [5 marks ]

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5 questions · timed · auto-graded

Question 15 Marks
List the steps to conserve the resources.
Answer
As we know, we all are dependent on the resources. But we should keep in mind that resources are limited in nature. If we misuse it, our future generation will have no resources. This is an alarming situation. We can take following steps: We should cook our food on low flame. Devices that consume less energy like $CFL$s and $LED$ lights should be preferred. We should take care not to waste electricity. We should cover our cooking vessels while cooking. Instead of use of individual vehicles, use of public transport should be encouraged. Solar or tidal energy should be developed and encouraged. Dams should be use to generate electricity instead of burning coal or petroleum. Public awareness programmes should be conducted.
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Question 25 Marks
How is the energy useful to us? Explain.
Answer
We need energy in almost every field of our life. Without energy our life is impossible. Some of the uses of energy are: We need energy of fuels to generate electricity and to run vehicles. We need energy to run our electrical appliances like refrigerator, $TV$, radio, computer, etc. We need energy at construction sites to construct houses, buildings, etc. We need energy to cook our food and other domestic use. We need energy (petrochemicals) for manufacturing fibres, plastics, paints, cosmetics, etc. All the factories, industries, agricultural devices depend on power supply to run the machines.
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Question 35 Marks
Write a short note on petroleum.
Answer
Petroleum is the liquid form of fuel. It is also known as crude oil and found trapped between the layers of impervious rocks under the ground. It is a natural resource, which formed by the dead plants and animals in the sea. It is a dark coloured viscous liquid and like all other oils, it is lighter than water. It is a mixture of different hydrocarbons. It undergoes fractional distillation to yield petrol, kerosene, diesel and other chemicals used in manufacture of plastics.
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Question 45 Marks
The burning of fossil fuels causes air pollution. Explain.
Answer
The burning of fossil fuels causes a lot of air pollution. The burning of coal produces gases like carbon dioxide, carbon monoxide, sulphur dioxide, etc., which can lead to undesirable changes in climate due to increase greenhouse effect. The major air pollutants produced by the burning of petrol in automobiles are carbon monoxide, sulphur dioxide, unbumt hydrocarbons, etc. These pollutants are harmful for human beings and living organisms which causes breathing problems and skin diseases.
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Question 55 Marks
Explain about the varieties of coal.
Answer
Depending upon the amount of carbon content, coal may be of four types: Peat: This is the most inferior and softest form of coal. Its carbon content is very low. It has a large amount of moisture and is not much suitable to be used as fuel. Lignite: Lignite is comparatively harder than peat, but still is very soft. Its carbon content is more than that of peat. Bituminous: Its carbon content is higher, as it is free from moisture and other impurities. Anthracite: This is the highest grade coal. This is also known as hard coal. It has maximum amount of carbon. It produces a very little smoke.
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as requested in detail. [5 marks ] - Science STD 8 Questions - Vidyadip