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Class 10 Science Chapter 12 Important Questions for Exams
Class 10 Science important questions can be a more beneficial to the students. It is not an easy task to score high in exams especially in Science subject. You need to understand the concepts in dept and complex topics. Important Questions for Class 10 Science CBSE Chapter Wise. An efficient preparation by solving a lot of questions from each chapter is necessary. Without knowing important questions from each topic it may difficult to attend the examination. You have to learn thoroughly to tackle any kind of questions.� Yes, Shivansh Singh, NCERT is enough for biology class 10th CBSE boards. in fact NCERT is more than enough for literally any CBSE exam. Some key benefits of studying NCERT books for CBSE Students are stated below: 1. Offers in-depth knowledge in easy language. CL provides CBSE Chemistry prep material for class 10 students. Get free Key Notes, MCQs, Tests, Sample Papers, NCERT Solutions, NCERT Solutions, Important Questions for class 10 maths important questions with answers.� Important questions for class 10th maths ncert.

These provides an extra practice to the students during the preparation of school exams as well as board exams. Class 10 Science Chapter 14 Extra Questions contains short and long questions with answers and explanation. Questions are divided into sets of 5 questions for the simplicity and to make study easier. Previous years CBSE board examination questions are also available with answers.

All the questions are solved with suitable answers. Class 10 Science Chapter 14 Extra questions contains most of the frequently asked questions in Ncert Book Questions For Class 10th List the school tests. We need energy to perform various function of life. The material that provide the requisite amount of energy is the source of energy.

For example, i We need heat energy too cook food. The various sources are: Fuels, wood, coal, kerosene, cooking gas etc. The various sources are: Petrol, diesel.

The source is electricity. The source is diesel and electricity. The following are the characteristic of a good source of energy: i It should give an adequate amount of net energy or work per unit volume of mass.

The change of one form of energy into another form of energy is called transformation of energy. The different forms of energy are: potential energy, kinetic energy, chemical energy, heat energy, solar energy, electrical energy and light energy. When a body from a height falls to the ground its potential energy is convert into kinetic energy and then into heat energy.

Advantages of classifying energy as renewable or non-renewable are: i It tells us which energy sources should be used judiciously that it could be used for maximum length of time example non-renewable sources. Any substance which may be burnt in air to produce heat and light is known as fuel. For example wood, coal, kerosene, petrol. Coal, petroleum and natural gas are examples of fossils fuels. These are found in nature due to the decompose of animals and plants which have remained embedded inside earth crust due to geological changes over millions of years.

Fossil fuels are obtained from the buried plants and animals processes. Thus chances of reoccurring of such processes is very rare and after the present stock is exhausted, we cannot hope to get new stocks unless there are drastic changes in the changes in the earth processes. So fossil fuels are classified as non-renewable sources. This affects our water and soil sources. It takes more than 15 years for a tree to mature.

Cutting of wood also causes environment imbalance. Further burning of wood causes a lot of pollution. For these reason it is not advised to use wood as a fuel. It took millions of years for fossil fuels to be formed. So if all the fossil fuels are exhausted today, then it will be after another long period of millions of years that people can hope to see these again.

So they should be used with care and caution and not wasted at all. Fossil fuels like coal, petroleum and natural gas are non-renewable energy sources.

These are produced over millions of years due to show changes and under special circumstances. These are not continuous processes and further it is not becoming possible to discover their new deposits.

With the present rate of their consumption it is estimated that known deposits of petroleum in our country will be exhausted in another years and that of coal may last for another years. The material obtained from plants and animals used as fuel is called bio-mass. It is the conventional source of energy mainly in rural areas. For example, wood, agriculture, wastes and animal dung cakes together contribute about 80 per cent of the domestic requirement of fuel in rural areas.

Some of the conventional sources of energy have poor efficiency and produce a lot of smoke due to incomplete combustion. For example, Wood: As well-known wood is burnt in traditional chulhas. Besides incomplete burning it produce gases like carbon monoxide which are dangerous for health. It also leaves a lot of ashes. Animal dung: Animal dung mixed with mud and made in the form of cakes and dried are burnt in many parts of the country for use for domestic purposes.

As crowding cakes are burnt inefficiently in the conventional manner, it produces a lot of smoke. Further as animal dung contains useful nutrients for soil, the burning of animal dung causes considerable wastage of useful elements, besides producing air pollution. Agricultural wastage: Agricultural wastage like sugarcane are burnt for use in industries.

This and other animal and plant wastes could more profitably be used in bio gas plants. Fuels contain a large amount of carbon. When combustion is incomplete most of the carbon gets converted into carbon monoxide. Also unburnt carbon passes into atmosphere. It causes the following problems: 1. Carbon monoxide is extremely poisonous and cause acute respiratory problem. Carbon monoxide pollutes the atmosphere and damage ozone layer which saves us from ill-effect of ultraviolet rays.

Due of release of unburnt carbon vapours, atmosphere gets polluted and fuel is also wasted unnecessarily. There are two ways in which animal dung can be used as fuel: i To heat animal dung in the form of cakes.

The second method gives fuel which is more efficient and thus it is a better way of using animal dung as a fuel. The following materials may be used to produce bio-gas: i Plant wastes like husk, grass, dry leaves, weeds, vegetable strains. Animal and plant wastes are called bio mass. These are degraded by anaerobic organisms in the presence of water to form mixture of gases such as methane, carbon dioxide, hydrogen and hydrogen Sulphide. The mixture of gases is called bio-gas.

Methane is an excellent fuel. The use of cow dung in bio gas plants to produce bio gas as fuel is preferred over the use of cow dung directly because of the following reasons:. Now when the cow dung is used to prepare bio-gas then the residue left behind is still rich in nutrient and can be used as manure. But if the cow dung is burnt in the form of dried cow-dung cakes, then the nutrient contained therein are destroyed and hence cannot be used as manure.

On the other hand, cow dung cakes on burning produce a lot of smoke which cause air pollution. On the other hand, cow dung cakes doo not burn completely and leave behind a lot of ash. Charcoal is a better fuel than wood because it i burns without flame ii is comparatively smokeless iii has higher heat generation efficiency.

Bio-gas is a mixture of methane, hydrogen, carbon dioxide and hydrogen Sulphide. Methane is the major constituent. It is also called gobar-gas. Animal wastes and plant wastes contain a lot of carbon compounds like carbohydrates, proteins and fats.

The anaerobic bacteria in the presence of water but in the absence of air, degradation these compounds to methane gas which is the main constituent.

The energy derived from flowering water, wind, tides, ocean waves and bio-gas are the renewable sources. These sources can be harnessed into energy so long as the earth derives its heat and light from the sun or so long as the present solar system exists.

Nuclear energy and geothermal energy is also likely to be available for a much longer time. Wood is another renewable source of energy. Thought it takes almost 15 years for a tree to mature, this and nuclear energy are also classified as renewable sources. Bio-gas is considered a good domestic fuel because of the following reasons: i Bio-gas burns without any smoke and so does not cause air pollution. It can be continuously supplied by pipes directly from the gas plant.

Many village families neither have adequate number of cattle to feed the individual bio-gas plant nor do they have means to meet the initial cost for the construction of bio-gas plant is shared by plant their own.

In such cases the cost of installing such a big bio-gas plant is shared by all the plant all the people in the village community and all and all the cattle dung available in the village is used to feed the common bio-gas plant. The bio-gas produced therein is supplied to all the village homes through gas pipes. Materials that can be used to produce bio-gas: cow dung, vegetable wastes. Uses of bio-gas i It can be used for cooking food and other domestic heating purposes.

Advantages of bio-gas plant i It provides useful manure for agriculture. The residue of living organisms such as remains of plant, animal, and their products from which fuel can be obtained is called biomass. Biomass is a renewable source of energy. It includes a biodegradable material from industries b organic waste material c agriculture and forest residues.

Bio-mass can be used a as a bio-fuel b for the production of fibre, paper, chemical or heat c as a source of energy in industries d to generate e to produce biogas by 10th Ncert Important Questions Version its anaerobic digestion. The kinetic energy possessed by the blowing wind is called wind energy.

The factors responsible for the blowing wind are: i Uneven heating of equational region and polar region of earth by sun rays. Equational region of earth receives of earth more solar heat radiations from the sun as compared to other parts of the earth.

Therefore, the air in these regions warms and rises up the air in these regions warms and rises up. The cooler air from the polar regions starts. Blowing towards the equatorial hot region to fill the space vacated by the hot upward rising air. As a result, movement of air take place which forms the wind. Uses of wind energy.

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