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question_answer1) Fuels used in thermal power plants are fossil fuels. Why?
question_answer2) Which is the ultimate source of energy?
question_answer3) Though a hot iron emits radiations, yet it is not visible in the dark. Why?
question_answer4) What is the minimum wind velocity required for obtaining useful energy with a windmill?
question_answer5) Name two forms of energy in which solar energy manifests itself in oceans.
question_answer6) What steps can help minimize environmental pollution caused by burning of fossil fuels?
question_answer7) What does acid rain happen?
question_answer8) What energy transformations occur in a hydro power plant?
question_answer9) How is the slurry left in a bio-gas plant in the end used?
question_answer10) Name the nuclear process that is responsible for energy release on (a) sun and (b) nuclear reactor.
question_answer11) Name any two materials used for fabricating solar cells.
question_answer12) Which gas is formed by decomposing plant and animal matter in marshy areas?
question_answer13) Give a few applications of wind.
question_answer14) Which layer of atmosphere is mainly responsible for absorption of ultraviolet radiation coming from sun?
question_answer15) Give one constructive and destructive use of nuclear power.
question_answer16) What type of radiation is emitted by hot electric iron?
question_answer17) Name two dams whose construction was opposed by local people.
question_answer18) Why is a car parked in the sun with windows closed found to be hotter inside than outside?
question_answer19) Which metal is used to connect various solar cells?
question_answer20) Give one disadvantage of nuclear power.
question_answer21) Name the source of wind energy.
question_answer22) Why are thermal power plants set up near coal or oil fields?
question_answer23) How much energy requirement of India is met by hydro power plant?
question_answer24) What is bagasse? To what use is it put to?
question_answer25) Write the drawback of energy obtained from fusion.
question_answer26) A solar cell transforms energy of one form into another form. What are these two forms of energy?
question_answer27) Windmill is used to produce electricity. Write the sequence of energy conversion in a wind mill.
question_answer28) The mass number of three elements A, B and C are 2, 180 and 235. Which one of them is suitable to make a hydrogen bomb?
question_answer29) Which type of reflector is usually used in box type solar cooker?
question_answer30) The cost of production of electricity in a thermal power station located in Bihar/Jharkhand/Odisha is lesser than in Gujarat/Maharashtra. Do you agree? Justify your answer.
question_answer31) Fuels used in thermal power plants are fossil fuels. Why?
question_answer32) Which is the ultimate source of energy?
question_answer33) Though a hot iron emits radiations, yet it is not visible in the dark. Why?
question_answer34) What is the minimum wind velocity required for obtaining useful energy with a windmill?
question_answer35) Name two forms of energy in which solar energy manifests itself in oceans.
question_answer36) What steps can help minimize environmental pollution caused by burning of fossil fuels?
question_answer37) What does acid rain happen?
question_answer38) What energy transformations occur in a hydro power plant?
question_answer39) How is the slurry left in a bio-gas plant in the end used?
question_answer40) Name the nuclear process that is responsible for energy release on (a) sun and (b) nuclear reactor.
question_answer41) Name any two materials used for fabricating solar cells.
question_answer42) Which gas is formed by decomposing plant and animal matter in marshy areas?
question_answer43) Give a few applications of wind.
question_answer44) Which layer of atmosphere is mainly responsible for absorption of ultraviolet radiation coming from sun?
question_answer45) Give one constructive and destructive use of nuclear power.
question_answer46) What type of radiation is emitted by hot electric iron?
question_answer47) Name two dams whose construction was opposed by local people.
question_answer48) Why is a car parked in the sun with windows closed found to be hotter inside than outside?
question_answer49) Which metal is used to connect various solar cells?
question_answer50) Give one disadvantage of nuclear power.
question_answer51) Name the source of wind energy.
question_answer52) Why are thermal power plants set up near coal or oil fields?
question_answer53) How much energy requirement of India is met by hydro power plant?
question_answer54) What is bagasse? To what use is it put to?
question_answer55) Write the drawback of energy obtained from fusion.
question_answer56) A solar cell transforms energy of one form into another form. What are these two forms of energy?
question_answer57) Windmill is used to produce electricity. Write the sequence of energy conversion in a wind mill.
question_answer58) The mass number of three elements A, B and C are 2, 180 and 235. Which one of them is suitable to make a hydrogen bomb?
question_answer59) Which type of reflector is usually used in box type solar cooker?
question_answer60) The cost of production of electricity in a thermal power station located in Bihar/Jharkhand/Odisha is lesser than in Gujarat/Maharashtra. Do you agree? Justify your answer.
question_answer61) How is wood charcoal made? Write one advantage of using charcoal over wood as a domestic fuel.
question_answer62) Name the type of reaction in the sun which produces its energy. List two conditions which are present at the centre of sun responsible for this reaction.
question_answer63) List four activities from our daily life in which solar energy is used.
question_answer64) Explain the principle on which a windmill works.
question_answer65) LPG is a better fuel than coal. How?
question_answer66) Why is tidal energy not exploited on a commercial scale?
question_answer67) List two ways in which animal dung is used as a fuel and compare both the ways.
question_answer68) What do you mean by bio-mass? Give examples of bio-mass.
question_answer69) List the causes of increasing energy requirements.
question_answer70) Expand OTEC. On what principle is it based?
question_answer71) What are solar cells? List their uses.
question_answer72) State the type of energy conversion taking place in (a) thermal power plant (b) solar power plant.
question_answer73) Which part of the solar cooker is responsible for greenhouse effect?
question_answer74) Though wood is a renewable source of energy, but the use of wood as a fuel is not a wise decision. Explain.
question_answer75) Firewood is a conventional fuel. List any four reasons for replacing it with alternate sources of energy.
question_answer76) Wavelength of radiation incident on a surface is 850 nm. Will the surface become visible when exposed to this radiation? Explain.
question_answer77) You have wood, kerosene and LPG. Which one source of energy would you use for cooking your food and why? Give the reason.
question_answer78) A student has set up a solar cooker in a box by using a black painted aluminium sheet, a black cooking vessel, some glass wool, a glass sheet and a mirror plate. What is the role of each item used in the solar cooker?
question_answer79) How do technological inputs improve the efficiency of bio-mass fuel?
question_answer80) We are looking for alternative or non-conventional sources of energy. State three reasons for it.
question_answer81) The surface area of a concentrator type solar heater is 5m2. It can reflect 80% of solar radiation incident on it while it absorbs the rest. Calculate the energy concentrated by the heater at its focus in 2 hours if solar energy was delivered to it at the rate of .
question_answer82) It is advantageous to convert bio-mass into a bio-gas rather than burning bio-mass directly. Why?
question_answer83) How does construction of dams across the river get linked with the production of greenhouse gases?
question_answer84) What is a nuclear waste? What are the hazards of nuclear waste to living things?
question_answer85) (a) Name the device used to convert solar energy into heat and solar energy into electricity. (b) Explain the principle of working of a windmill.
question_answer86) Bio-gas is considered to be a boon to the farmers. Give reasons.
question_answer87) How is nuclear energy generated during nuclear fusion?
question_answer88) If energy in the universe is constant, why is the world yelling out for energy crisis? What does judicious use of energy imply?
question_answer89) Write two different ways of harnessing energy from ocean.
question_answer90) (a) State the principle of working of windmill. (b) What is the minimum wind velocity required to obtain useful energy with a windmill? (c) Give one limitation of windmill.
question_answer91) Hydro energy is an indirect source of solar energy. Justify.
question_answer92) Solar energy can be harnessed directly as well as indirectly. Give two examples of each type.
question_answer93) List three energy sources that are considered to be inexhaustible. State three reasons in support of your answer.
question_answer94) Why is there so much emphasis on changing over from petrol/diesel driven automobiles to CNG driven vehicles.
question_answer95) What type of mixture are separated by fractional distillation? Name the fraction of crude oil whose boiling point is more than 350°C. Where is it mostly used as fuel?
question_answer96) Name the places of our country where fields of natural gas are found. Why is it called a clean fuel? Give two reasons.
question_answer97) Increasing demand of fossil fuels has caused harm to our environment. List its three ill-effects. Suggest three measures to reduce the consumption of fossil fuels.
question_answer98) Radheshyam is a prosperous farmer. He happily ensures that the cow-dung and other biological wastes in his home are sent to the nearby bio-gas plant of the village. He receives subsidised fuel for home and manure for his crops from there and his field shows good output. Maniram is surprised that despite using, expensive fertilisers, his output barely matches that of Radheshyam. However, he never goes and discusses it with Radheshyam. Read the above passage and answer the following questions (a) How does Radheshyam get manure from the bio-gas plant? (b) Throw light on values of Radheshyam. (c) What values are shown by Radheshyam?
question_answer99) Asha makes a model of solar water heater. She tries to make it attractive using a shiny silvery surface on outer walls of pipeline. Her friend Gauri stops her from doing so on logical grounds. But Asha does not bother to pay attention to her advice. Read the above passage and answer the following questions (a) Predict the success of model prepared by Asha. (b) If you were in Gauri's place, what values would you like to instill in Asha?
question_answer100) Shalini makes a model of box type solar cooker. She uses a black translucent plastic sheet as lid over the box. The output of the cooker is found to be too low. Her teacher observes this activity of her and asks her for some modifications to enhance its efficiency. Shalini enquires about the reason for such modification and does the needful. Read the above passage and answer the following questions (a) Why does the solar cooker not function well? (b) What modifications does the teacher ask to make and why? (c) Discuss the values of Shalini and her teacher.
question_answer101) Manisha loves to cook a variety of food. She is busy all the time baking, frying, heating and refrigerating. Shraddha insists upon saving the fuels in cooking activities and tells Manisha how can she save electricity and burning fuel by adopting simple habits however, Manisha is reluctant to apply any new cooking style. Read the above passage and answer the following questions (a) Which method would have been suggested by Shraddha? (b) Throw light on values of Manisha. (c) Discuss the qualities of Shraddha which you would appreciate.
question_answer102) The government of Delhi and Delhi Transport Corporation (DTC) have converted passenger buses into CNG-based vehicles. Give reasons for such a decision. Is CNG an ideal fuel according to you? Comment.
question_answer103) What are the environmental consequences of using fossil fuels? Suggest the steps to minimise the pollution caused by various sources of energy including non- conventional sources of energy.
question_answer104) What are (a) solar concentrators (b) solar cell panels? How are they an improvement on simple devices? Why are solar cell panels costly?
question_answer105) Energy from various sources is consider to have been derived from the sun. Do you agree? Justify your answer.
question_answer106) What is bio-mass? Explain the principle and working of a bio-gas plant using a labeled schematic diagram?
question_answer107) If you could use any source of energy for heating your food, which one would you use and why? [NCERT]
question_answer108) How has the traditional use of wind and water energy been modified for our convenience? [NCERT, CBSE (AI) 2008C]
question_answer109) What type of reactions occur inside the Sun which produces solar energy?
question_answer110) Which of the following are renewable and which are non-renewable sources of energy? Coal, wind, tides, Sun, petrol, biomass, CNG, hydro energy.
question_answer111) Which part of Sun's energy is responsible for drying clothes and exposure to which part could be a health hazard?
question_answer112) What type of energy is possessed by wind?
question_answer113) Though a hot iron emits radiations, yet it is not visible in the dark, why?
question_answer114) What is bagasse?
question_answer115) Define anaerobic degradation.
question_answer116) Name the main constituent of biogas. [NCERT Exemplar]
question_answer117) What is the minimum wind velocity required for obtaining useful energy with a windmill?
question_answer118) Name two forms of energy in which solar energy manifests itself in oceans.
question_answer119) Name any two materials that are used for making solar cells.
question_answer120) What is the range of wavelength of electromagnetic waves that constitute visible radiation?
question_answer121) What steps can help minimize environmental pollution caused by burning of fossil fuels? [NCERT Exemplar]
question_answer122) State the two forms of energy in which energy is mainly utilized at our homes.
question_answer123) What are the different types of nuclear reactions?
question_answer124) Why does acid rain happen? [NCERT Exemplar]
question_answer125) What energy transformations occur in a hydro power plant? [NCERT Exemplar]
question_answer126) What is a chain reaction?
question_answer127) Why are we looking at alternate sources of energy? [NCERT]
question_answer128) What kind of mirror?concave, convex or plain would be best suited for use in a solar cooker? Why? [NCERT, CBSE Delhi 2008C]
question_answer129) Firewood is a conventional fuel. List any four reasons for replacing it with alternate sources of energy.
question_answer130) What is the use of the black painted surface in solar heating devices?
question_answer131) State two advantages and two disadvantages of geothermal energy.
question_answer132) What are the limitations of the energy that can be obtained from the oceans? [NCERT]
question_answer133) What is biogas? Why is biogas considered an ideal fuel for domestic use? [CBSE Delhi 2009]
question_answer134) Why is biogas a better fuel than animal dung cakes?
question_answer135) Can any source of energy be pollution-free? Why or why not? [NCERT]
question_answer136) What causes the wind to blow?
question_answer137) Give some uses and advantages of solar energy.
question_answer138) Give an example of indirect harnessing of solar energy.
question_answer139) Hydrogen has been used as a rocket fuel. Would you consider it a cleaner fuel than CNG? Why or why not? [NCERT]
question_answer140) Give the names of two energy sources that you would consider to be exhaustible. Give reasons for your choices. [NCERT]
question_answer141) State the important uses of solar cells.
question_answer142) Explain solar cell panel.
question_answer143) State the important uses of wind energy.
question_answer144) Compare and contrast fossil fuels and the Sun as direct sources of energy. [NCERT]
question_answer145) Explain why only a small part of the solar energy that strikes the upper regions of atmosphere reaches the surface of the Earth.
question_answer146) Why charcoal is considered a better fuel than wood? What are the disadvantages of converting wood into charcoal?
question_answer147) Compare and contrast biomass and hydroelectricity as sources of energy. [NCERT]
question_answer148) Describe the steps involved in obtaining biogas and explain what is meant by anaerobic decomposition.
question_answer149) Explain how the energy of flowing water is related to solar energy.
question_answer150) Mention any two advantages and two disadvantages of producing hydroelectricity by building dams on rivers.
question_answer151) What is the importance of hydro power plants in India? Describe how electric energy is generated in such plants. [CBSE Delhi 2008]
question_answer152) Write two advantages of classifying energy sources as renewable and non-renewable.
question_answer153) [CBSE Delhi 2008] Why is tidal energy not likely to be a potential source of energy?
question_answer154) Why is it not possible to make use of solar cells to meet all our energy needs? State at least two reasons to support your answer.
question_answer155) (i) Name the device used to convert (a) solar energy into heat, and (b) solar energy into electricity. (ii) Explain the principle of working of a windmill.
question_answer156) Biogas is considered to be a boon to the farmers. Give reasons.
question_answer157) How is nuclear energy generated during nuclear fusion? [CBSE (AI) 2008C]
question_answer158) What are the limitations of extracting energy from (i) the wind (ii) waves (iii) tides?
question_answer159) [NCERT, CBSE (Al) 2008] Give the construction and working of a solar cooker
question_answer160) What are the environmental consequences of the increasing demand for energy? What steps would you suggest to reduce energy consumption? [NCERT, CBSE Delhi 2008]
question_answer161) (a) Distinguish between renewable and non-renewable sources of energy. (b) Choose the renewable sources of energy from the following list. Coal, biogas, Sun, natural gas [CBSE Delhi 2009] (b) Sun and biogas
question_answer162) What is biogas? Describe the working of a biogas plant with the help of a labelled diagram.
question_answer163) What are the advantages and disadvantages of using a solar cooker? Are there places where solar cookers would have limited utility? [NCERT]
question_answer164) What are the environmental consequences of using fossil fuels? Suggest the steps to minimize the pollution caused by various sources of energy including non-conventional sources of energy. [NCERT Exemplar]
question_answer165) Differentiate between box-type solar cooker and spherical reflector type solar cooker. [CBSE Delhi 2009]
question_answer166) What are the limitations of extracting energy from (i) the wind (ii) waves (iii) tides?
question_answer167) [NCERT, CBSE (Al) 2008] Give the construction and working of a solar cooker
question_answer168) What are the environmental consequences of the increasing demand for energy? What steps would you suggest to reduce energy consumption? [NCERT, CBSE Delhi 2008]
question_answer169) (a) Distinguish between renewable and non-renewable sources of energy. (b) Choose the renewable sources of energy from the following list. Coal, biogas, Sun, natural gas [CBSE Delhi 2009] (b) Sun and biogas
question_answer170) What is biogas? Describe the working of a biogas plant with the help of a labelled diagram.
question_answer171) What are the advantages and disadvantages of using a solar cooker? Are there places where solar cookers would have limited utility? [NCERT]
question_answer172) What are the environmental consequences of using fossil fuels? Suggest the steps to minimize the pollution caused by various sources of energy including non-conventional sources of energy. [NCERT Exemplar]
question_answer173) Differentiate between box-type solar cooker and spherical reflector type solar cooker. [CBSE Delhi 2009]
question_answer174) Which part of the solar cooker is responsible for greenhouse effect?
question_answer175) Though wood is a renewable source of energy, but the use of wood as a fuel is not a wise decision. Explain.
question_answer176) Wavelength of radiation incident on a surface is 850 nm. Will the surface become visible when exposed to this radiation? Explain?
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