Case Study Questions Class 10 Science Chapter 14 Sources of Energy
CBSE Class 10 Case Study Questions Science Sources of Energy. Important Case Study Questions for Class 10 Board Exam Students. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Sources of Energy.
At Case Study Questions there will given a Paragraph. In where some Important Questions will made on that respective Case Based Study. There will various types of marks will given 1 marks, 2 marks, 3 marks, 4 marks.
Case study: 1
The good source of energy is that source which would do a large amount of work per unit volume or mass, which may be easily accessible, may be easy to store and transport and be economical. There are two types sources of energy they are conventional and non conventional sources of energy. Conventional sources of energy includes fossil fuels like coal, petroleum etc. The fossil fuels are also called as non renewable sources of energy. When fossil fuels burns then acidic oxides of carbon , nitrogen and sulphur are released in the air and which causes acid rain. Because of acid rain the water and soil get affected. Again air pollution causes which leads to green house effect.
Thermal power plant, hydro power plant are used to produce electricity. The thermal power plants are set up near coal or oil fields so that it can be used for producing heat energy which in turn used to produce electricity. In case of hydro power plant kinetic energy of flowing water or potential energy of water at a height is used for producing electricity. To avoid pollution now a days we are using some improved technology which are used in conventional sources of energy. When wood is burning in a limited supply of oxygen that time water and volatile substances present in it get removed and the residue formed is charcoal. Charcoal burns without smoke and has higher efficiency of producing heat also and hence there is no pollution.
Bio gas is also used for producing heat because it burns without smoke and no residue is formed after burning.
Questions:
1) Which type of gas is contained in bio gas ?
2) Why bio gas is excellent fuel?
3) Thermal power plants are used for?
4) Which oxides are responsible for acid rain?
Answers:
1) Bio gas contains 75% of methane.
2) Bio gas is an excellent fuel as it contains 75% of methane which burns without smoke, no residue will be left after burning like ash, wood, charcoal.
3) Thermal power plants are used to produce heat energy which is again converted into electrical energy.
4) The acidic oxides of carbon, sulphur and nitrogen are responsible for acid rain.
Case study: 2
Sun is the most abundant, enormous source of energy. We know that black surface is good absorbent than a white or other reflecting surface. In solar cookers and solar water heaters such absorbent are used. In solar cookers, mirrors are used to focus the light rays coming from the sun. A particular solar cell generates voltage of 0.5-1 V and which produces about 0.7 W of electricity. So in order to produce huge amount of electric energy many solar cells are combined to form a solar panel. Tidal energy and wave energy is also used for producing electricity on large scale.
Because of gravitational pull of the moon on the spinning earth the water level of sea rises and falls. Turbines are used for converting tidal energy into electricity. Also, the kinetic energy possessed by water waves near the sea shore is used for producing electricity.
The water at the surface of sea get heated by the sun and water at deeper part become cold and this temperature difference is used in ocean thermal energy conversion plants.
Questions:
1) What are the advantages of solar cell?
2) Which type of semiconducting material is used in making solar cell?
3) What is solar constant?
4) What is the approximate value of solar constant?
Answers:
1) The advantages of solar cell are they are not having moving parts, they requires very little maintenance and work, also they can be set up in remote and inaccessible hamlets or sparsely inhabited areas.
2) In making solar cells the semiconducting material used is silicon.
3) The solar energy which is reaching to unit area at outer edge of the earth’s atmosphere which is exposed perpendicularly to the sunrays at a average distance between the sun and the earth is called as solar constant.
4) The approximate value of solar constant is found to be 1.4kW/m2.
Case study: 3
In molten rocks which are formed in the deeper hot regions of Earth crust get pushed upward and trapped in some regions called as hot spots. When this hot spots comes in contact with underground water then steam is generated. These steam is used to rotate turbine in order to produce electricity.
The energy produced in nuclear fission is used to produce electricity. The nucleus of heavy atoms when bombarded with low energy neutrons get splited into lighter nuclei and tremendous amount of energy is released. In nuclear fission, the amount of mass difference between reactant nuclei and the product nuclei is converted into energy which given by the equation E = ∆mc2.
There are many hazardous effects of nuclear fission in which disposal and storage of spent or used fuel like uranium which emits harmful radiations which leads to environmental contamination. Initially, the energy produced during nuclear fission reaction was used for destructive purpose but now a days it is also used for producing electricity.
Questions:
1) Which type of heavy nuclei are used in nuclear fission?
2) 1eV = ?
3) In Maharashtra in which regions nuclear power reactors are located?
4) Which process is safer to produce energy nuclear fission or nuclear fusion?
Answers:
1) In nuclear fission the nucleus of heavy atoms like uranium, plutonium or thorium are used.
2) 1eV = 1.602*10-19 joules
3) In Maharashtra nuclear power reactors are located at Tarapur.
4) Nuclear fusion is the safer process to produce energy.
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